diff --git a/nsprpub/config/Makefile b/nsprpub/config/Makefile
index e8002edf7054..6afd21d831fc 100644
--- a/nsprpub/config/Makefile
+++ b/nsprpub/config/Makefile
@@ -34,7 +34,7 @@ endif
 # Temporary workaround to disable the generation of
 # library build time because now.c uses the 'long long'
 # data type that's not available on some platforms.
-ifeq (,$(filter-out NEC SCOOS UNIXWARE,$(OS_ARCH)))
+ifeq (,$(filter-out NEC NEXTSTEP SCOOS UNIXWARE,$(OS_ARCH)))
 DEFINES += -DOMIT_LIB_BUILD_TIME
 endif
 
diff --git a/nsprpub/config/NEXTSTEP.mk b/nsprpub/config/NEXTSTEP.mk
new file mode 100644
index 000000000000..7f6f4fe5b460
--- /dev/null
+++ b/nsprpub/config/NEXTSTEP.mk
@@ -0,0 +1,52 @@
+#
+# The contents of this file are subject to the Netscape Public License
+# Version 1.0 (the "NPL"); you may not use this file except in
+# compliance with the NPL.  You may obtain a copy of the NPL at
+# http://www.mozilla.org/NPL/
+# 
+# Software distributed under the NPL is distributed on an "AS IS" basis,
+# WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
+# for the specific language governing rights and limitations under the
+# NPL.
+# 
+# The Initial Developer of this code under the NPL is Netscape
+# Communications Corporation.  Portions created by Netscape are
+# Copyright (C) 1998 Netscape Communications Corporation.  All Rights
+# Reserved.
+#
+
+#
+# Config stuff for NEXTSTEP
+#
+
+include $(MOD_DEPTH)/config/UNIX.mk
+
+CC			= cc
+CCC			= cc++
+
+RANLIB			= ranlib
+
+OS_REL_CFLAGS		= -D$(shell uname -p)
+CPU_ARCH		:= $(shell uname -p)
+
+# "Commons" are tentative definitions in a global scope, like this:
+#     int x;
+# The meaning of a common is ambiguous.  It may be a true definition:
+#     int x = 0;
+# or it may be a declaration of a symbol defined in another file:
+#     extern int x;
+# Use the -fno-common option to force all commons to become true
+# definitions so that the linker can catch multiply-defined symbols.
+# Also, common symbols are not allowed with Rhapsody dynamic libraries.
+
+OS_CFLAGS		= $(DSO_CFLAGS) $(OS_REL_CFLAGS) -Wall -fno-common -pipe -DNEXTSTEP -DHAVE_STRERROR -DHAVE_BSD_FLOCK -D_POSIX_SOURCE -traditional-cpp -posix
+
+DEFINES			+= -D_PR_LOCAL_THREADS_ONLY -D_PR_NEED_FAKE_POLL
+
+ARCH			= $(CPU_ARCH)
+
+# May override this with -bundle to create a loadable module.
+#DSO_LDOPTS		= -dynamiclib
+
+#MKSHLIB			= $(CC) -arch $(CPU_ARCH) $(DSO_LDOPTS)
+DLL_SUFFIX		= dylib
diff --git a/nsprpub/config/nsinstall.c b/nsprpub/config/nsinstall.c
index c3a3bba8560a..67c0d225aea4 100644
--- a/nsprpub/config/nsinstall.c
+++ b/nsprpub/config/nsinstall.c
@@ -43,7 +43,7 @@
 
 #define HAVE_LCHOWN
 
-#if defined(AIX) || defined(BSDI) || defined(HPUX) || defined(LINUX) || defined(SUNOS4) || defined(SCO) || defined(UNIXWARE) || defined(RHAPSODY)
+#if defined(AIX) || defined(BSDI) || defined(HPUX) || defined(LINUX) || defined(SUNOS4) || defined(SCO) || defined(UNIXWARE) || defined(RHAPSODY) || defined(NEXTSTEP)
 #undef HAVE_LCHOWN
 #endif
 
@@ -51,15 +51,39 @@
  * Does getcwd() take NULL as the first argument and malloc
  * the result buffer?
  */
-#if !defined(RHAPSODY)
+#if !defined(RHAPSODY) && !defined(NEXTSTEP)
 #define GETCWD_CAN_MALLOC
 #endif
 
+#ifdef NEXTSTEP
+#include <bsd/libc.h>
+
+/*
+** balazs.pataki@sztaki.hu: The getcwd is broken in NEXTSTEP (returns 0),
+** when called on a mounted fs. Did anyone notice this? Here's an ugly
+** workaround ...
+*/
+#define getcwd(b,s)   my_getcwd(b,s)
+
+static char *
+my_getcwd (char *buf, size_t size)
+{
+    FILE *pwd = popen("pwd", "r");
+    char *result = fgets(buf, size, pwd);
+
+    if (result) {
+        buf[strlen(buf)-1] = '\0';
+    }
+    pclose (pwd);
+    return buf;
+}
+#endif /* NEXTSTEP */
+
 #ifdef LINUX
 #include <getopt.h>
 #endif
 
-#if defined(SCO) || defined(UNIXWARE) || defined(SNI) || defined(NCR) || defined(NEC)
+#if defined(SCO) || defined(UNIXWARE) || defined(SNI) || defined(NCR) || defined(NEC) || defined(NEXTSTEP)
 #if !defined(S_ISLNK) && defined(S_IFLNK)
 #define S_ISLNK(a)	(((a) & S_IFMT) == S_IFLNK)
 #endif
diff --git a/nsprpub/pr/include/gencfg.c b/nsprpub/pr/include/gencfg.c
index 695f17ba0f20..f8160611c29d 100644
--- a/nsprpub/pr/include/gencfg.c
+++ b/nsprpub/pr/include/gencfg.c
@@ -83,6 +83,12 @@
 #endif
 #endif
 
+#if defined(__NeXT__)
+#ifndef NEXTSTEP
+      error - NEXTSTEP is not defined
+#endif
+#endif
+
 /************************************************************************/
 
 /* Generate cpucfg.h */
diff --git a/nsprpub/pr/include/md/Makefile b/nsprpub/pr/include/md/Makefile
index a365ef91d1f3..d25635445c92 100644
--- a/nsprpub/pr/include/md/Makefile
+++ b/nsprpub/pr/include/md/Makefile
@@ -99,6 +99,10 @@ ifeq ($(OS_ARCH),Rhapsody)
 MDCPUCFG_H = _rhapsody.cfg
 endif
 
+ifeq ($(OS_ARCH),NEXTSTEP)
+MDCPUCFG_H = _nextstep.cfg
+endif
+
 ifeq ($(OS_ARCH),NEWS-OS)
 MDCPUCFG_H = _sony.cfg
 endif
diff --git a/nsprpub/pr/include/md/_nextstep.cfg b/nsprpub/pr/include/md/_nextstep.cfg
new file mode 100644
index 000000000000..2525eb76a2e8
--- /dev/null
+++ b/nsprpub/pr/include/md/_nextstep.cfg
@@ -0,0 +1,236 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/*
+ * The contents of this file are subject to the Netscape Public License
+ * Version 1.0 (the "NPL"); you may not use this file except in
+ * compliance with the NPL.  You may obtain a copy of the NPL at
+ * http://www.mozilla.org/NPL/
+ * 
+ * Software distributed under the NPL is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
+ * for the specific language governing rights and limitations under the
+ * NPL.
+ * 
+ * The Initial Developer of this code under the NPL is Netscape
+ * Communications Corporation.  Portions created by Netscape are
+ * Copyright (C) 1998 Netscape Communications Corporation.  All Rights
+ * Reserved.
+ */
+
+#ifndef nspr_cpucfg___
+#define nspr_cpucfg___
+
+#ifndef XP_UNIX
+#define XP_UNIX
+#endif
+
+#ifndef NEXTSTEP
+#define NEXTSTEP
+#endif
+
+/*	Platform specific
+*/
+#if defined(__sparc__)
+
+/* Check these
+*/
+#undef  IS_LITTLE_ENDIAN
+#define IS_BIG_ENDIAN 1
+#define	HAVE_LONG_LONG
+#undef	HAVE_ALIGNED_DOUBLES
+#define	HAVE_ALIGNED_LONGLONGS 1
+
+#define PR_BYTES_PER_BYTE   1
+#define PR_BYTES_PER_SHORT  2
+#define PR_BYTES_PER_INT    4
+#define PR_BYTES_PER_INT64  8
+#define PR_BYTES_PER_LONG   4
+#define PR_BYTES_PER_FLOAT  4
+#define PR_BYTES_PER_DOUBLE 8
+/* Taken from _solaris.cfg
+*/
+#define PR_BYTES_PER_WORD   4
+#define PR_BYTES_PER_DWORD  8
+#define PR_BYTES_PER_WORD_LOG2   2
+#define PR_BYTES_PER_DWORD_LOG2  3
+
+#define PR_BITS_PER_BYTE    8
+#define PR_BITS_PER_SHORT   16
+#define PR_BITS_PER_INT     32
+#define PR_BITS_PER_INT64   64
+#define PR_BITS_PER_LONG    32
+#define PR_BITS_PER_FLOAT   32
+#define PR_BITS_PER_DOUBLE  64
+/* Taken from _solaris.cfg
+*/
+#define PR_BITS_PER_WORD    32
+
+#define PR_BITS_PER_BYTE_LOG2   3
+#define PR_BITS_PER_SHORT_LOG2  4
+#define PR_BITS_PER_INT_LOG2    5
+#define PR_BITS_PER_INT64_LOG2  6
+#define PR_BITS_PER_LONG_LOG2   5
+#define PR_BITS_PER_FLOAT_LOG2  5
+#define PR_BITS_PER_DOUBLE_LOG2 6
+/* Taken from _solaris.cfg
+*/
+#define PR_BITS_PER_WORD_LOG2   5
+
+#define PR_ALIGN_OF_SHORT   2
+#define PR_ALIGN_OF_INT     4
+#define PR_ALIGN_OF_LONG    4
+#define PR_ALIGN_OF_INT64   8
+#define PR_ALIGN_OF_FLOAT   4
+#define PR_ALIGN_OF_DOUBLE  8
+#define PR_ALIGN_OF_POINTER 4
+
+#define PR_WORDS_PER_DWORD_LOG2  1
+
+#elif defined(__m68k__)
+
+/* Check these
+*/
+#undef  IS_LITTLE_ENDIAN
+#define IS_BIG_ENDIAN 1
+#define	HAVE_LONG_LONG
+#undef	HAVE_ALIGNED_DOUBLES
+#define	HAVE_ALIGNED_LONGLONGS 1
+
+#define PR_BYTES_PER_BYTE   1
+#define PR_BYTES_PER_SHORT  2
+#define PR_BYTES_PER_INT    4
+#define PR_BYTES_PER_INT64  8
+#define PR_BYTES_PER_LONG   4
+#define PR_BYTES_PER_FLOAT  4
+#define PR_BYTES_PER_DOUBLE 8
+#define PR_BYTES_PER_WORD   4
+#define PR_BYTES_PER_DWORD  8
+#define PR_BYTES_PER_WORD_LOG2   2
+#define PR_BYTES_PER_DWORD_LOG2  3
+
+#define PR_BITS_PER_BYTE    8
+#define PR_BITS_PER_SHORT   16
+#define PR_BITS_PER_INT     32
+#define PR_BITS_PER_INT64   64
+#define PR_BITS_PER_LONG    32
+#define PR_BITS_PER_FLOAT   32
+#define PR_BITS_PER_DOUBLE  64
+#define PR_BITS_PER_WORD    32
+
+#define PR_BITS_PER_BYTE_LOG2   3
+#define PR_BITS_PER_SHORT_LOG2  4
+#define PR_BITS_PER_INT_LOG2    5
+#define PR_BITS_PER_INT64_LOG2  6
+#define PR_BITS_PER_LONG_LOG2   5
+#define PR_BITS_PER_FLOAT_LOG2  5
+#define PR_BITS_PER_DOUBLE_LOG2 6
+#define PR_BITS_PER_WORD_LOG2   5
+
+#define PR_ALIGN_OF_SHORT   2
+#define PR_ALIGN_OF_INT     2
+#define PR_ALIGN_OF_LONG    2
+#define PR_ALIGN_OF_INT64   2
+#define PR_ALIGN_OF_FLOAT   2
+#define PR_ALIGN_OF_DOUBLE  2
+#define PR_ALIGN_OF_POINTER 2
+
+#define PR_WORDS_PER_DWORD_LOG2  1
+
+#elif defined(__i386__)
+
+/* Check these
+*/
+#define IS_LITTLE_ENDIAN 1
+#undef  IS_BIG_ENDIAN
+#define	HAVE_LONG_LONG
+#undef	HAVE_ALIGNED_DOUBLES
+#define	HAVE_ALIGNED_LONGLONGS 1
+
+#define PR_BYTES_PER_BYTE   1
+#define PR_BYTES_PER_SHORT  2
+#define PR_BYTES_PER_INT    4
+#define PR_BYTES_PER_INT64  8
+#define PR_BYTES_PER_LONG   4
+#define PR_BYTES_PER_FLOAT  4
+#define PR_BYTES_PER_DOUBLE 8
+#define PR_BYTES_PER_WORD   4
+#define PR_BYTES_PER_DWORD  8
+
+#define PR_BITS_PER_BYTE    8
+#define PR_BITS_PER_SHORT   16
+#define PR_BITS_PER_INT     32
+#define PR_BITS_PER_INT64   64
+#define PR_BITS_PER_LONG    32
+#define PR_BITS_PER_FLOAT   32
+#define PR_BITS_PER_DOUBLE  64
+#define PR_BITS_PER_WORD    32
+
+#define PR_BITS_PER_BYTE_LOG2   3
+#define PR_BITS_PER_SHORT_LOG2  4
+#define PR_BITS_PER_INT_LOG2    5
+#define PR_BITS_PER_INT64_LOG2  6
+#define PR_BITS_PER_LONG_LOG2   5
+#define PR_BITS_PER_FLOAT_LOG2  5
+#define PR_BITS_PER_DOUBLE_LOG2 6
+#define PR_BITS_PER_WORD_LOG2   5
+
+#define PR_ALIGN_OF_SHORT   2
+#define PR_ALIGN_OF_INT     4
+#define PR_ALIGN_OF_LONG    4
+#define PR_ALIGN_OF_INT64   4
+#define PR_ALIGN_OF_FLOAT   4
+#define PR_ALIGN_OF_DOUBLE  4
+#define PR_ALIGN_OF_POINTER 4
+#define PR_ALIGN_OF_WORD    4
+
+#define PR_BYTES_PER_WORD_LOG2   2
+#define PR_BYTES_PER_DWORD_LOG2  3
+#define PR_WORDS_PER_DWORD_LOG2  1
+#endif /* defined(__somearch__) */
+
+
+#ifndef NO_NSPR_10_SUPPORT
+
+#define BYTES_PER_BYTE		PR_BYTES_PER_BYTE
+#define BYTES_PER_SHORT 	PR_BYTES_PER_SHORT
+#define BYTES_PER_INT 		PR_BYTES_PER_INT
+#define BYTES_PER_INT64		PR_BYTES_PER_INT64
+#define BYTES_PER_LONG		PR_BYTES_PER_LONG
+#define BYTES_PER_FLOAT		PR_BYTES_PER_FLOAT
+#define BYTES_PER_DOUBLE	PR_BYTES_PER_DOUBLE
+#define BYTES_PER_WORD		PR_BYTES_PER_WORD
+#define BYTES_PER_DWORD		PR_BYTES_PER_DWORD
+
+#define BITS_PER_BYTE		PR_BITS_PER_BYTE
+#define BITS_PER_SHORT		PR_BITS_PER_SHORT
+#define BITS_PER_INT		PR_BITS_PER_INT
+#define BITS_PER_INT64		PR_BITS_PER_INT64
+#define BITS_PER_LONG		PR_BITS_PER_LONG
+#define BITS_PER_FLOAT		PR_BITS_PER_FLOAT
+#define BITS_PER_DOUBLE		PR_BITS_PER_DOUBLE
+#define BITS_PER_WORD		PR_BITS_PER_WORD
+
+#define BITS_PER_BYTE_LOG2	PR_BITS_PER_BYTE_LOG2
+#define BITS_PER_SHORT_LOG2	PR_BITS_PER_SHORT_LOG2
+#define BITS_PER_INT_LOG2	PR_BITS_PER_INT_LOG2
+#define BITS_PER_INT64_LOG2	PR_BITS_PER_INT64_LOG2
+#define BITS_PER_LONG_LOG2	PR_BITS_PER_LONG_LOG2
+#define BITS_PER_FLOAT_LOG2	PR_BITS_PER_FLOAT_LOG2
+#define BITS_PER_DOUBLE_LOG2 	PR_BITS_PER_DOUBLE_LOG2
+#define BITS_PER_WORD_LOG2	PR_BITS_PER_WORD_LOG2
+
+#define ALIGN_OF_SHORT		PR_ALIGN_OF_SHORT
+#define ALIGN_OF_INT		PR_ALIGN_OF_INT
+#define ALIGN_OF_LONG		PR_ALIGN_OF_LONG
+#define ALIGN_OF_INT64		PR_ALIGN_OF_INT64
+#define ALIGN_OF_FLOAT		PR_ALIGN_OF_FLOAT
+#define ALIGN_OF_DOUBLE		PR_ALIGN_OF_DOUBLE
+#define ALIGN_OF_POINTER	PR_ALIGN_OF_POINTER
+#define ALIGN_OF_WORD		PR_ALIGN_OF_WORD
+
+#define BYTES_PER_WORD_LOG2	PR_BYTES_PER_WORD_LOG2
+#define BYTES_PER_DWORD_LOG2	PR_BYTES_PER_DWORD_LOG2
+#define WORDS_PER_DWORD_LOG2	PR_WORDS_PER_DWORD_LOG2
+
+#endif /* NO_NSPR_10_SUPPORT */
+
+#endif /* nspr_cpucfg___ */
diff --git a/nsprpub/pr/include/md/_nextstep.h b/nsprpub/pr/include/md/_nextstep.h
new file mode 100644
index 000000000000..97c0ca9acb8f
--- /dev/null
+++ b/nsprpub/pr/include/md/_nextstep.h
@@ -0,0 +1,284 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/*
+ * The contents of this file are subject to the Netscape Public License
+ * Version 1.0 (the "NPL"); you may not use this file except in
+ * compliance with the NPL.  You may obtain a copy of the NPL at
+ * http://www.mozilla.org/NPL/
+ * 
+ * Software distributed under the NPL is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
+ * for the specific language governing rights and limitations under the
+ * NPL.
+ * 
+ * The Initial Developer of this code under the NPL is Netscape
+ * Communications Corporation.  Portions created by Netscape are
+ * Copyright (C) 1998 Netscape Communications Corporation.  All Rights
+ * Reserved.
+ */
+
+#ifndef nspr_nextstep_defs_h___
+#define nspr_nextstep_defs_h___
+
+#include "prthread.h"
+
+#include <bsd/libc.h>
+#include <bsd/syscall.h>
+
+/*	syscall() is not declared in NEXTSTEP's syscall.h ...
+*/
+extern int syscall(int number, ...);
+
+/*
+ * Internal configuration macros
+ */
+
+#define PR_LINKER_ARCH	"nextstep"
+#define _PR_SI_SYSNAME  "NEXTSTEP"
+#if defined(__sparc__)
+#define _PR_SI_ARCHITECTURE "sparc"
+#elif defined(__m68k__)
+#define _PR_SI_ARCHITECTURE "m68k"
+#elif defined(__i386__)
+#define _PR_SI_ARCHITECTURE "x86"
+#else
+error Unknown NEXTSTEP architecture
+#endif
+#define PR_DLL_SUFFIX		".so"
+
+#define _PR_VMBASE              0x30000000
+#define _PR_STACK_VMBASE	0x50000000
+#define _MD_DEFAULT_STACK_SIZE	65536L
+#define _MD_MMAP_FLAGS          MAP_PRIVATE
+
+#undef  HAVE_STACK_GROWING_UP
+
+#define HAVE_WEAK_MALLOC_SYMBOLS
+
+/* do this until I figure out the rhapsody dll stuff. */
+#define HAVE_DLL
+#define USE_RLD
+#define _PR_HAVE_SOCKADDR_LEN
+#define _PR_STAT_HAS_ONLY_ST_ATIME
+#define _PR_NO_LARGE_FILES
+
+#define USE_SETJMP
+
+#ifndef _PR_PTHREADS
+
+#include <setjmp.h>
+
+#define PR_CONTEXT_TYPE	jmp_buf
+
+#define CONTEXT(_th) ((_th)->md.context)
+
+/* balazs.pataki@sztaki.hu:
+** __sparc__ is checked
+** __m68k__ is checked
+** __i386__ is a guess (one of the two defines should work)
+*/
+#if defined(__sparc__)
+#define _MD_GET_SP(_th)		(_th)->md.context[2]
+#elif defined(__m68k__)
+#define _MD_GET_SP(_th)		(_th)->md.context[2]
+#elif defined(__i386__)
+/* One of this two must be OK ... try using sc_onstack
+*/
+#define _MD_GET_SP(_th)    (((struct sigcontext *) (_th)->md.context)->sc_onstack)
+//#define _MD_GET_SP(_th)		(_th)->md.context[0].sc_esp
+#else
+error Unknown NEXTSTEP architecture
+#endif
+
+#define PR_NUM_GCREGS	_JBLEN
+
+/*
+** Initialize a thread context to run "_main()" when started
+*/
+#define _MD_INIT_CONTEXT(_thread, _sp, _main, status)  \
+{  \
+    *status = PR_TRUE;  \
+    if (setjmp(CONTEXT(_thread))) {  \
+        _main();  \
+    }  \
+    _MD_GET_SP(_thread) = (int) ((_sp) - 64); \
+}
+
+#define _MD_SWITCH_CONTEXT(_thread)  \
+    if (!setjmp(CONTEXT(_thread))) {  \
+	(_thread)->md.errcode = errno;  \
+	_PR_Schedule();  \
+    }
+
+/*
+** Restore a thread context, saved by _MD_SWITCH_CONTEXT
+*/
+#define _MD_RESTORE_CONTEXT(_thread) \
+{   \
+    errno = (_thread)->md.errcode;  \
+    _MD_SET_CURRENT_THREAD(_thread);  \
+    longjmp(CONTEXT(_thread), 1);  \
+}
+
+/* Machine-dependent (MD) data structures */
+
+struct _MDThread {
+    PR_CONTEXT_TYPE context;
+    int id;
+    int errcode;
+};
+
+struct _MDThreadStack {
+    PRInt8 notused;
+};
+
+struct _MDLock {
+    PRInt8 notused;
+};
+
+struct _MDSemaphore {
+    PRInt8 notused;
+};
+
+struct _MDCVar {
+    PRInt8 notused;
+};
+
+struct _MDSegment {
+    PRInt8 notused;
+};
+
+/*
+ * md-specific cpu structure field
+ */
+#define _PR_MD_MAX_OSFD FD_SETSIZE
+
+struct _MDCPU_Unix {
+    PRCList ioQ;
+    PRUint32 ioq_timeout;
+    PRInt32 ioq_max_osfd;
+    PRInt32 ioq_osfd_cnt;
+#ifndef _PR_USE_POLL
+    fd_set fd_read_set, fd_write_set, fd_exception_set;
+    PRInt16 fd_read_cnt[_PR_MD_MAX_OSFD],fd_write_cnt[_PR_MD_MAX_OSFD],
+				fd_exception_cnt[_PR_MD_MAX_OSFD];
+#else
+	struct pollfd *ioq_pollfds;
+	int ioq_pollfds_size;
+#endif	/* _PR_USE_POLL */
+};
+
+#define _PR_IOQ(_cpu)			((_cpu)->md.md_unix.ioQ)
+#define _PR_ADD_TO_IOQ(_pq, _cpu) PR_APPEND_LINK(&_pq.links, &_PR_IOQ(_cpu))
+#define _PR_FD_READ_SET(_cpu)		((_cpu)->md.md_unix.fd_read_set)
+#define _PR_FD_READ_CNT(_cpu)		((_cpu)->md.md_unix.fd_read_cnt)
+#define _PR_FD_WRITE_SET(_cpu)		((_cpu)->md.md_unix.fd_write_set)
+#define _PR_FD_WRITE_CNT(_cpu)		((_cpu)->md.md_unix.fd_write_cnt)
+#define _PR_FD_EXCEPTION_SET(_cpu)	((_cpu)->md.md_unix.fd_exception_set)
+#define _PR_FD_EXCEPTION_CNT(_cpu)	((_cpu)->md.md_unix.fd_exception_cnt)
+#define _PR_IOQ_TIMEOUT(_cpu)		((_cpu)->md.md_unix.ioq_timeout)
+#define _PR_IOQ_MAX_OSFD(_cpu)		((_cpu)->md.md_unix.ioq_max_osfd)
+#define _PR_IOQ_OSFD_CNT(_cpu)		((_cpu)->md.md_unix.ioq_osfd_cnt)
+#define _PR_IOQ_POLLFDS(_cpu)		((_cpu)->md.md_unix.ioq_pollfds)
+#define _PR_IOQ_POLLFDS_SIZE(_cpu)	((_cpu)->md.md_unix.ioq_pollfds_size)
+
+#define _PR_IOQ_MIN_POLLFDS_SIZE(_cpu)	32
+
+struct _MDCPU {
+	struct _MDCPU_Unix md_unix;
+};
+
+#define _MD_INIT_LOCKS()
+#define _MD_NEW_LOCK(lock) PR_SUCCESS
+#define _MD_FREE_LOCK(lock)
+#define _MD_LOCK(lock)
+#define _MD_UNLOCK(lock)
+#define _MD_INIT_IO()
+#define _MD_IOQ_LOCK()
+#define _MD_IOQ_UNLOCK()
+
+extern PRStatus _MD_InitializeThread(PRThread *thread);
+
+#define _MD_INIT_RUNNING_CPU(cpu)       _MD_unix_init_running_cpu(cpu)
+#define _MD_INIT_THREAD                 _MD_InitializeThread
+#define _MD_EXIT_THREAD(thread)
+#define _MD_SUSPEND_THREAD(thread)      _MD_suspend_thread
+#define _MD_RESUME_THREAD(thread)       _MD_resume_thread
+#define _MD_CLEAN_THREAD(_thread)
+
+extern PRStatus _MD_CREATE_THREAD(
+    PRThread *thread,
+    void (*start) (void *),
+    PRThreadPriority priority,
+    PRThreadScope scope,
+    PRThreadState state,
+    PRUint32 stackSize);
+extern void _MD_SET_PRIORITY(struct _MDThread *thread, PRUintn newPri);
+extern PRStatus _MD_WAIT(PRThread *, PRIntervalTime timeout);
+extern PRStatus _MD_WAKEUP_WAITER(PRThread *);
+extern void _MD_YIELD(void);
+
+#endif /* ! _PR_PTHREADS */
+
+extern void _MD_EarlyInit(void);
+extern PRIntervalTime _PR_UNIX_GetInterval(void);
+extern PRIntervalTime _PR_UNIX_TicksPerSecond(void);
+
+#define _MD_EARLY_INIT                  _MD_EarlyInit
+#define _MD_FINAL_INIT			_PR_UnixInit
+#define _MD_GET_INTERVAL                  _PR_UNIX_GetInterval
+#define _MD_INTERVAL_PER_SEC              _PR_UNIX_TicksPerSecond
+
+/*
+ * We wrapped the select() call.  _MD_SELECT refers to the built-in,
+ * unwrapped version.
+ */
+#define _MD_SELECT(nfds,r,w,e,tv) syscall(SYS_select,nfds,r,w,e,tv)
+
+/* For writev() */
+#include <sys/uio.h>
+
+/* signal.h */
+/* 	balazs.pataki@sztaki.hu: this is stolen from sunos4.h. The things is that
+** 	NEXTSTEP doesn't support these flags for `struct sigaction's sa_flags, so
+**	I have to fake them ...
+*/
+#define SA_RESTART 0
+
+/* mmap */
+/* 	balazs.pataki@sztaki.hu: NEXTSTEP doesn't have mmap, at least not 
+**	publically. We have sys/mman.h, but it doesn't declare mmap(), and
+**	PROT_NONE is also missing. syscall.h has entries for mmap, munmap, and 
+**	mprotect so I wrap these in nextstep.c as  mmap(), munmap() and mprotect()
+**	and pray for it to work.
+**	
+*/
+#define PROT_NONE	0x0
+
+caddr_t mmap(caddr_t addr, size_t len, int prot, int flags,
+          int fildes, off_t off);
+int munmap(caddr_t addr, size_t len);
+int mprotect(caddr_t addr, size_t len, int prot);
+
+/*	my_mmap() is implemented in nextstep.c and is based on map_fd() of mach.
+*/
+caddr_t my_mmap(caddr_t addr, size_t len, int prot, int flags,
+          int fildes, off_t off);
+int my_munmap(caddr_t addr, size_t len);
+
+
+/*	string.h
+*/
+/* balazs.pataki@sztaki.hu: this is missing so implemenetd in nextstep.c ...
+*/
+char *strdup(const char *s1);
+
+/* unistd.h
+*/
+/* 	balazs.pataki@sztaki.hu: these functions are hidden, though correctly 
+**	implemented in NEXTSTEP. Here I give the declaration for them to be used
+**	by prmalloc.c, and I have a wrapped syscall() version of them in nextstep.c
+*/
+int brk(void *endds);
+void *sbrk(int incr);
+
+#endif /* nspr_nextstep_defs_h___ */
diff --git a/nsprpub/pr/include/md/_unixos.h b/nsprpub/pr/include/md/_unixos.h
index 5d3f523dcfbe..ab507d860039 100644
--- a/nsprpub/pr/include/md/_unixos.h
+++ b/nsprpub/pr/include/md/_unixos.h
@@ -27,7 +27,7 @@
  * Linux: FD_SETSIZE is defined in /usr/include/sys/select.h and should
  * not be redefined.
  */
-#if !defined(LINUX) && !defined(RHAPSODY)
+#if !defined(LINUX) && !defined(RHAPSODY) && !defined(NEXTSTEP)
 #ifndef FD_SETSIZE
 #define FD_SETSIZE  4096
 #endif
@@ -144,7 +144,7 @@ extern void _MD_unix_init_running_cpu(struct _PRCPU *cpu);
 ** work - it just means that we don't really have a functional
 ** redzone.
 */
-#if defined(DEBUG) && !defined(RHAPSODY)
+#if defined(DEBUG) && !defined(RHAPSODY) && !defined(NEXTSTEP)
 #if !defined(SOLARIS)	
 #include <string.h>  /* for memset() */
 #define _MD_INIT_STACK(ts,REDZONE)					\
diff --git a/nsprpub/pr/include/md/prosdep.h b/nsprpub/pr/include/md/prosdep.h
index 980025585723..b0150007dd44 100644
--- a/nsprpub/pr/include/md/prosdep.h
+++ b/nsprpub/pr/include/md/prosdep.h
@@ -80,6 +80,9 @@ PR_BEGIN_EXTERN_C
 #elif defined(RHAPSODY)
 #include "md/_rhapsody.h"
 
+#elif defined(NEXTSTEP)
+#include "md/_nextstep.h"
+
 #elif defined(SOLARIS)
 #include "md/_solaris.h"
 
diff --git a/nsprpub/pr/include/private/primpl.h b/nsprpub/pr/include/private/primpl.h
index f4c32230f5dd..200b8fc386cc 100644
--- a/nsprpub/pr/include/private/primpl.h
+++ b/nsprpub/pr/include/private/primpl.h
@@ -1536,6 +1536,7 @@ extern PRBool _pr_ipv6_enabled;  /* defined in prnetdb.c */
         && !defined(_PR_PTHREADS) && !defined(_PR_GLOBAL_THREADS_ONLY) \
         && !defined(PURIFY) \
         && !defined(RHAPSODY) \
+        && !defined(NEXTSTEP) \
         && !(defined (UNIXWARE) && defined (USE_SVR4_THREADS))
 #define _PR_OVERRIDE_MALLOC
 #endif
diff --git a/nsprpub/pr/src/io/prfile.c b/nsprpub/pr/src/io/prfile.c
index ece72b0af5c3..ffe6479af81e 100644
--- a/nsprpub/pr/src/io/prfile.c
+++ b/nsprpub/pr/src/io/prfile.c
@@ -265,7 +265,7 @@ PR_IMPLEMENT(PRFileDesc*) PR_Open(const char *name, PRIntn flags, PRIntn mode)
 
 PRInt32 PR_GetSysfdTableMax(void)
 {
-#if defined(XP_UNIX) && !defined(AIX)
+#if defined(XP_UNIX) && !defined(AIX) && !defined(NEXTSTEP)
     struct rlimit rlim;
 
     if ( getrlimit(RLIMIT_NOFILE, &rlim) < 0) {
@@ -274,7 +274,7 @@ PRInt32 PR_GetSysfdTableMax(void)
     }
 
     return rlim.rlim_max;
-#elif defined(AIX)
+#elif defined(AIX) || defined(NEXTSTEP)
     return sysconf(_SC_OPEN_MAX);
 #elif defined(WIN32) || defined(OS2)
     /*
@@ -294,7 +294,7 @@ PRInt32 PR_GetSysfdTableMax(void)
 
 PRInt32 PR_SetSysfdTableSize(int table_size)
 {
-#if defined(XP_UNIX) && !defined(AIX)
+#if defined(XP_UNIX) && !defined(AIX) && !defined(NEXTSTEP)
     struct rlimit rlim;
     PRInt32 tableMax = PR_GetSysfdTableMax();
 
@@ -318,7 +318,8 @@ PRInt32 PR_SetSysfdTableSize(int table_size)
     }
 
     return rlim.rlim_cur;
-#elif defined(AIX) || defined(WIN32) || defined(WIN16) || defined(OS2)
+#elif defined(AIX) || defined(WIN32) || defined(WIN16) || defined(OS2) \
+        || defined(NEXTSTEP)
     PR_SetError(PR_NOT_IMPLEMENTED_ERROR, 0);
     return -1;
 #elif defined (XP_MAC)
diff --git a/nsprpub/pr/src/io/prmapopt.c b/nsprpub/pr/src/io/prmapopt.c
index 6bd4dddc1a77..88496d825807 100644
--- a/nsprpub/pr/src/io/prmapopt.c
+++ b/nsprpub/pr/src/io/prmapopt.c
@@ -36,6 +36,11 @@
 
 #include "primpl.h"
 
+#if defined(NEXTSTEP)
+/* NEXTSTEP is special: this must come before netinet/tcp.h. */
+#include <netinet/in_systm.h>  /* n_short, n_long, n_time */
+#endif
+
 #if defined(XP_UNIX) || defined(OS2)
 #include <netinet/tcp.h>  /* TCP_NODELAY, TCP_MAXSEG */
 #endif
diff --git a/nsprpub/pr/src/linking/prlink.c b/nsprpub/pr/src/linking/prlink.c
index ff06b33d840a..7516ef0e9564 100644
--- a/nsprpub/pr/src/linking/prlink.c
+++ b/nsprpub/pr/src/linking/prlink.c
@@ -32,7 +32,7 @@
 #include <dlfcn.h>
 #elif defined(USE_HPSHL)
 #include <dl.h>
-#elif defined(RHAPSODY)
+#elif defined(RHAPSODY) || defined(NEXTSTEP)
 #include <mach-o/dyld.h>
 #endif
 
@@ -45,7 +45,7 @@
 /*
  * On these platforms, symbols have a leading '_'.
  */
-#if defined(SUNOS4) || defined(RHAPSODY) || defined(WIN16)
+#if defined(SUNOS4) || defined(RHAPSODY) || defined(NEXTSTEP) || defined(WIN16)
 #define NEED_LEADING_UNDERSCORE
 #endif
 
@@ -71,7 +71,7 @@ struct PRLibrary {
 #ifdef XP_UNIX
 #if defined(USE_HPSHL)
     shl_t                       dlh;
-#elif defined(RHAPSODY)
+#elif defined(RHAPSODY) || defined(NEXTSTEP)
     NSModule                    dlh;
 #else
     void*                       dlh;
@@ -170,7 +170,7 @@ void _PR_InitLinker(void)
 #elif defined(USE_HPSHL)
     h = NULL;
     /* don't abort with this NULL */
-#elif defined(RHAPSODY)
+#elif defined(RHAPSODY) || defined(NEXTSTEP)
     h = NULL; /* XXXX  toshok */
 #else
 #error no dll strategy
@@ -641,7 +641,7 @@ PR_LoadLibrary(const char *name)
     void *h = dlopen(name, RTLD_LAZY);
 #elif defined(USE_HPSHL)
     shl_t h = shl_load(name, BIND_DEFERRED | DYNAMIC_PATH, 0L);
-#elif defined(RHAPSODY)
+#elif defined(RHAPSODY) || defined(NEXTSTEP)
     NSObjectFileImage ofi;
     NSModule h = NULL;
     if (NSCreateObjectFileImageFromFile(name, &ofi)
@@ -714,7 +714,7 @@ PR_UnloadLibrary(PRLibrary *lib)
     result = dlclose(lib->dlh);
 #elif defined(USE_HPSHL)
     result = shl_unload(lib->dlh);
-#elif defined(RHAPSODY)
+#elif defined(RHAPSODY) || defined(NEXTSTEP)
     result = NSUnLinkModule(lib->dlh, FALSE);
 #else
 #error Configuration error
@@ -827,7 +827,7 @@ pr_FindSymbolInLib(PRLibrary *lm, const char *name)
     if (shl_findsym(&lm->dlh, name, TYPE_PROCEDURE, &f) == -1) {
         f = NULL;
     }
-#elif defined(RHAPSODY)
+#elif defined(RHAPSODY) || defined(NEXTSTEP)
     f = NSAddressOfSymbol(NSLookupAndBindSymbol(name));
 #endif
 #endif /* HAVE_DLL */
diff --git a/nsprpub/pr/src/md/prosdep.c b/nsprpub/pr/src/md/prosdep.c
index 326b3536bd6d..3d288b071495 100644
--- a/nsprpub/pr/src/md/prosdep.c
+++ b/nsprpub/pr/src/md/prosdep.c
@@ -42,7 +42,8 @@ static void GetPageSize(void)
     /* Get page size */
 #ifdef XP_UNIX
 #if defined SUNOS4 || defined LINUX || defined BSDI || defined AIX \
-	|| defined FREEBSD || defined NETBSD || defined OPENBSD || defined RHAPSODY
+        || defined FREEBSD || defined NETBSD || defined OPENBSD \
+        || defined RHAPSODY || defined NEXTSTEP
     _pr_pageSize = getpagesize();
 #elif defined(HPUX)
     /* I have no idea. Don't get me started. --Rob */
diff --git a/nsprpub/pr/src/md/unix/Makefile b/nsprpub/pr/src/md/unix/Makefile
index 7d36371ce47d..3d9e41df8728 100644
--- a/nsprpub/pr/src/md/unix/Makefile
+++ b/nsprpub/pr/src/md/unix/Makefile
@@ -94,6 +94,10 @@ RHAPSODY_CSRCS = \
 	rhapsody.c \
 	$(NULL)
 
+NEXTSTEP_CSRCS = \
+	nextstep.c \
+	$(NULL)
+
 NEC_CSRCS = \
 	nec.c \
 	$(NULL)
@@ -163,6 +167,9 @@ endif
 ifeq ($(OS_ARCH),Rhapsody)
 CSRCS += $(RHAPSODY_CSRCS)
 endif
+ifeq ($(OS_ARCH),NEXTSTEP)
+CSRCS += $(NEXTSTEP_CSRCS)
+endif
 ifeq ($(OS_ARCH),NEC)
 CSRCS += $(NEC_CSRCS)
 endif
diff --git a/nsprpub/pr/src/md/unix/nextstep.c b/nsprpub/pr/src/md/unix/nextstep.c
new file mode 100644
index 000000000000..4bdc00a30c1e
--- /dev/null
+++ b/nsprpub/pr/src/md/unix/nextstep.c
@@ -0,0 +1,265 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/*
+ * The contents of this file are subject to the Netscape Public License
+ * Version 1.0 (the "NPL"); you may not use this file except in
+ * compliance with the NPL.  You may obtain a copy of the NPL at
+ * http://www.mozilla.org/NPL/
+ * 
+ * Software distributed under the NPL is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
+ * for the specific language governing rights and limitations under the
+ * NPL.
+ * 
+ * The Initial Developer of this code under the NPL is Netscape
+ * Communications Corporation.  Portions created by Netscape are
+ * Copyright (C) 1998 Netscape Communications Corporation.  All Rights
+ * Reserved.
+ */
+
+#include "primpl.h"
+
+#import <mach/mach.h>
+#import <mach/mach_error.h>
+#import <mach-o/dyld.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/mman.h>
+#include <syscall.h>
+
+
+
+/*	These functions are hidden in NEXTSTEP, but beacuse they have syscall()
+**	entries I can wrap these into their corresponding missing function.
+*/
+caddr_t
+mmap(caddr_t addr, size_t len, int prot, int flags,
+          int fildes, off_t off)
+{
+	return (caddr_t) syscall (SYS_mmap, addr, len, prot, flags, fildes, off);
+}
+
+int
+munmap(caddr_t addr, size_t len)
+{
+	return syscall (SYS_munmap, addr, len);
+}
+
+int
+mprotect(caddr_t addr, size_t len, int prot)
+{
+	return syscall (SYS_mprotect, addr, len, prot);
+}
+
+
+/* If found the brk() symbol in the sahred libraries but no syscall() entry ...
+** I don't know whether it will work ...
+int brk(void *endds)
+{
+	return syscall ();
+}
+*/
+
+void *sbrk(int incr)
+{
+	return (void *) syscall (SYS_sbrk, incr);
+}
+
+/*	These are my mach based versions, untested and probably bad ...
+*/
+caddr_t my_mmap(caddr_t addr, size_t len, int prot, int flags,
+          int fildes, off_t off)
+{
+	kern_return_t ret_val;
+	
+	/*	First map ...
+	*/
+	ret_val = map_fd ( fildes, 					/* fd				*/
+	                  (vm_offset_t) off,		/* offset			*/
+					  (vm_offset_t*)&addr,		/* address			*/
+					  TRUE, 					/* find_space		*/
+					  (vm_size_t) len);			/* size				*/
+
+	if (ret_val != KERN_SUCCESS) {
+    	mach_error("Error calling map_fd() in mmap", ret_val );
+		return (caddr_t)0;
+	}
+	
+	/*	... then protect (this is probably bad)
+	*/
+	ret_val = vm_protect( task_self(),			/* target_task 		*/
+						 (vm_address_t)addr,	/* address			*/
+						 (vm_size_t) len,		/* size 			*/
+						 FALSE,					/* set_maximum		*/
+						 (vm_prot_t) prot);		/* new_protection	*/
+	if (ret_val != KERN_SUCCESS) {
+		mach_error("vm_protect in mmap()", ret_val );
+		return (caddr_t)0;
+	}
+	
+	return addr;
+}
+
+int my_munmap(caddr_t addr, size_t len)
+{
+	kern_return_t ret_val;
+
+	ret_val = vm_deallocate(task_self(),
+	 						(vm_address_t) addr,
+							(vm_size_t) len);
+
+	if (ret_val != KERN_SUCCESS) {
+		mach_error("vm_deallocate in munmap()", ret_val);
+		return -1;
+	}
+	
+	return 0;
+}
+
+int my_mprotect(caddr_t addr, size_t len, int prot)
+{
+	vm_prot_t mach_prot;
+	kern_return_t ret_val;
+	
+	switch (prot) {
+		case PROT_READ:		mach_prot = VM_PROT_READ;		break;
+		case PROT_WRITE:	mach_prot = VM_PROT_WRITE;		break;
+		case PROT_EXEC:		mach_prot = VM_PROT_EXECUTE;	break;
+		case PROT_NONE:		mach_prot = VM_PROT_NONE;		break;
+	}
+	
+	ret_val = vm_protect(task_self(),			/* target_task 		*/
+						 (vm_address_t)addr,	/* address			*/
+						 (vm_size_t) len,		/* size 			*/
+						 FALSE,					/* set_maximum		*/
+						 (vm_prot_t) prot);		/* new_protection	*/
+
+	if (ret_val != KERN_SUCCESS) {
+		mach_error("vm_protect in mprotect()", ret_val);
+		return -1;
+	}
+	
+	return 0;
+}
+
+char *strdup(const char *s1)
+{
+	int len = strlen (s1);
+	char *copy = (char*) malloc (len+1);
+	
+	if (copy == (char*)0)
+		return (char*)0;
+
+	strcpy (copy, s1);
+
+	return copy;
+}
+
+/* Stub rld functions
+*/
+extern NSObjectFileImageReturnCode NSCreateObjectFileImageFromFile(
+    const char *pathName,
+    NSObjectFileImage *objectFileImage)
+{
+	return NSObjectFileImageFailure;
+}
+
+extern void * NSAddressOfSymbol(
+    NSSymbol symbol)
+{
+	return NULL;
+}
+
+extern NSModule NSLinkModule(
+    NSObjectFileImage objectFileImage, 
+    const char *moduleName, /* can be NULL */
+    enum bool bindNow)
+{
+	return NULL;
+}
+
+extern NSSymbol NSLookupAndBindSymbol(
+    const char *symbolName)
+{
+	return NULL;
+}
+
+extern enum bool NSUnLinkModule(
+    NSModule module, 
+    enum bool keepMemoryMapped)
+{
+	return 0;
+}
+
+
+
+void _MD_EarlyInit(void)
+{
+}
+
+PRWord *_MD_HomeGCRegisters(PRThread *t, int isCurrent, int *np)
+{
+#ifndef _PR_PTHREADS
+    if (isCurrent) {
+	(void) sigsetjmp(CONTEXT(t), 1);
+    }
+    *np = sizeof(CONTEXT(t)) / sizeof(PRWord);
+    return (PRWord *) CONTEXT(t);
+#else
+	*np = 0;
+	return NULL;
+#endif
+}
+
+#ifndef _PR_PTHREADS
+
+void
+_MD_SET_PRIORITY(_MDThread *thread, PRUintn newPri)
+{
+    return;
+}
+
+PRStatus
+_MD_InitializeThread(PRThread *thread)
+{
+	return PR_SUCCESS;
+}
+
+PRStatus
+_MD_WAIT(PRThread *thread, PRIntervalTime ticks)
+{
+    PR_ASSERT(!(thread->flags & _PR_GLOBAL_SCOPE));
+    _PR_MD_SWITCH_CONTEXT(thread);
+    return PR_SUCCESS;
+}
+
+PRStatus
+_MD_WAKEUP_WAITER(PRThread *thread)
+{
+    if (thread) {
+	PR_ASSERT(!(thread->flags & _PR_GLOBAL_SCOPE));
+    }
+    return PR_SUCCESS;
+}
+
+/* These functions should not be called for NEXTSTEP */
+void
+_MD_YIELD(void)
+{
+    PR_NOT_REACHED("_MD_YIELD should not be called for NEXTSTEP.");
+}
+
+PRStatus
+_MD_CREATE_THREAD(
+    PRThread *thread,
+    void (*start) (void *),
+    PRThreadPriority priority,
+    PRThreadScope scope,
+    PRThreadState state,
+    PRUint32 stackSize)
+{
+    PR_NOT_REACHED("_MD_CREATE_THREAD should not be called for NEXTSTEP.");
+	return PR_FAILURE;
+}
+
+#endif
diff --git a/nsprpub/pr/src/md/unix/objs.mk b/nsprpub/pr/src/md/unix/objs.mk
index 1d3213245a3e..311926a98997 100644
--- a/nsprpub/pr/src/md/unix/objs.mk
+++ b/nsprpub/pr/src/md/unix/objs.mk
@@ -86,6 +86,10 @@ RHAPSODY_CSRCS = \
 	rhapsody.c \
 	$(NULL)
 
+NEXTSTEP_CSRCS = \
+	nextstep.c \
+	$(NULL)
+
 NEC_CSRCS = \
 	nec.c \
 	$(NULL)
@@ -156,6 +160,9 @@ endif
 ifeq ($(OS_ARCH),Rhapsody)
 CSRCS += $(RHAPSODY_CSRCS)
 endif
+ifeq ($(OS_ARCH),NEXTSTEP)
+CSRCS += $(NEXTSTEP_CSRCS)
+endif
 ifeq ($(OS_ARCH),NEC)
 CSRCS += $(NEC_CSRCS)
 endif
diff --git a/nsprpub/pr/src/md/unix/unix.c b/nsprpub/pr/src/md/unix/unix.c
index 62de2cabf954..62096a6de586 100644
--- a/nsprpub/pr/src/md/unix/unix.c
+++ b/nsprpub/pr/src/md/unix/unix.c
@@ -46,7 +46,8 @@
 #if defined(IRIX) || defined(HPUX) || defined(OSF1) || defined(SOLARIS) \
     || defined(AIX4_1) || defined(LINUX) || defined(SONY) \
     || defined(BSDI) || defined(SCO) || defined(NEC) || defined(SNI) \
-    || defined(SUNOS4) || defined(NCR) || defined(RHAPSODY)
+    || defined(SUNOS4) || defined(NCR) || defined(RHAPSODY) \
+    || defined(NEXTSTEP)
 #define _PRSockLen_t int
 #elif (defined(AIX) && !defined(AIX4_1)) || defined(FREEBSD) \
     || defined(NETBSD) || defined(OPENBSD) || defined(UNIXWARE) || defined(DGUX)
diff --git a/nsprpub/pr/src/md/unix/uxwrap.c b/nsprpub/pr/src/md/unix/uxwrap.c
index e7a169866295..783b9885fd07 100644
--- a/nsprpub/pr/src/md/unix/uxwrap.c
+++ b/nsprpub/pr/src/md/unix/uxwrap.c
@@ -83,6 +83,9 @@ void PR_SetXtHackOkayToReleaseXLockFn(int (*fn)(void))
 
 #if defined(HPUX9)
 int select(size_t width, int *rl, int *wl, int *el, const struct timeval *tv)
+#elif defined(NEXTSTEP)
+int wrap_select(int width, fd_set *rd, fd_set *wr, fd_set *ex,
+        const struct timeval *tv)
 #elif defined(AIX4_1)
 int wrap_select(unsigned long width, void *rl, void *wl, void *el,
         struct timeval *tv)
diff --git a/nsprpub/pr/src/misc/pratom.c b/nsprpub/pr/src/misc/pratom.c
index d69bb6b06e8c..499c74801f44 100644
--- a/nsprpub/pr/src/misc/pratom.c
+++ b/nsprpub/pr/src/misc/pratom.c
@@ -39,11 +39,11 @@
  * The lock contention should be acceptable.
  */
 
-static PRLock *monitor = NULL;
+static PRLock *lock = NULL;
 void _PR_MD_INIT_ATOMIC()
 {
-    if (monitor == NULL) {
-        monitor = PR_NewLock();
+    if (lock == NULL) {
+        lock = PR_NewLock();
     }
 }
 
@@ -55,9 +55,9 @@ _PR_MD_ATOMIC_INCREMENT(PRInt32 *val)
     if (!_pr_initialized) {
         _PR_ImplicitInitialization();
     }
-    PR_Lock(monitor);
+    PR_Lock(lock);
     rv = ++(*val);
-    PR_Unlock(monitor);
+    PR_Unlock(lock);
     return rv;
 }
 
@@ -69,9 +69,9 @@ _PR_MD_ATOMIC_ADD(PRInt32 *ptr, PRInt32 val)
     if (!_pr_initialized) {
         _PR_ImplicitInitialization();
     }
-    PR_Lock(monitor);
+    PR_Lock(lock);
     rv = ((*ptr) += val);
-    PR_Unlock(monitor);
+    PR_Unlock(lock);
     return rv;
 }
 
@@ -83,9 +83,9 @@ _PR_MD_ATOMIC_DECREMENT(PRInt32 *val)
     if (!_pr_initialized) {
         _PR_ImplicitInitialization();
     }
-    PR_Lock(monitor);
+    PR_Lock(lock);
     rv = --(*val);
-    PR_Unlock(monitor);
+    PR_Unlock(lock);
     return rv;
 }
 
@@ -97,10 +97,10 @@ _PR_MD_ATOMIC_SET(PRInt32 *val, PRInt32 newval)
     if (!_pr_initialized) {
         _PR_ImplicitInitialization();
     }
-    PR_Lock(monitor);
+    PR_Lock(lock);
     rv = *val;
     *val = newval;
-    PR_Unlock(monitor);
+    PR_Unlock(lock);
     return rv;
 }
 
diff --git a/nsprpub/pr/tests/Makefile b/nsprpub/pr/tests/Makefile
index a004d214a61b..b84afe655093 100644
--- a/nsprpub/pr/tests/Makefile
+++ b/nsprpub/pr/tests/Makefile
@@ -281,6 +281,12 @@ ifeq ($(OS_ARCH), NCR)
     export LD_RUN_PATH = $(PWD)/$(DIST)/lib
 endif
 
+ifeq ($(OS_ARCH), NEXTSTEP)
+# balazs.pataki@sztaki.hu: linkage is done in a different pass in the `tests'
+# modeul, so we have to pass the `-posix' flag by "hand" to `ld'
+LDOPTS += -posix
+endif
+
 ifeq ($(OS_ARCH), NEWS-OS)
 # This hardcodes in the executable programs the directory to find
 # libnspr.so etc. at program startup.  Equivalent to the -R or -rpath