diff --git a/security/coreconf/Darwin.mk b/security/coreconf/Darwin.mk
new file mode 100644
index 000000000000..da05b77aa88f
--- /dev/null
+++ b/security/coreconf/Darwin.mk
@@ -0,0 +1,70 @@
+#
+# The contents of this file are subject to the Mozilla Public
+# License Version 1.1 (the "License"); you may not use this file
+# except in compliance with the License. You may obtain a copy of
+# the License at http://www.mozilla.org/MPL/
+# 
+# Software distributed under the License is distributed on an "AS
+# IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
+# implied. See the License for the specific language governing
+# rights and limitations under the License.
+# 
+# The Original Code is the Netscape security libraries.
+# 
+# The Initial Developer of the Original Code is Netscape
+# Communications Corporation.  Portions created by Netscape are 
+# Copyright (C) 1994-2000 Netscape Communications Corporation.  All
+# Rights Reserved.
+# 
+# Contributor(s):
+# 
+# Alternatively, the contents of this file may be used under the
+# terms of the GNU General Public License Version 2 or later (the
+# "GPL"), in which case the provisions of the GPL are applicable 
+# instead of those above.  If you wish to allow use of your 
+# version of this file only under the terms of the GPL and not to
+# allow others to use your version of this file under the MPL,
+# indicate your decision by deleting the provisions above and
+# replace them with the notice and other provisions required by
+# the GPL.  If you do not delete the provisions above, a recipient
+# may use your version of this file under either the MPL or the
+# GPL.
+#
+# Config stuff for Darwin.
+#
+
+include $(CORE_DEPTH)/coreconf/UNIX.mk
+
+CC		= cc
+CCC		= c++
+RANLIB		= ranlib
+
+ifeq (86,$(findstring 86,$(OS_TEST)))
+OS_REL_CFLAGS	= -Di386
+CPU_ARCH	= i386
+else
+OS_REL_CFLAGS	= -Dppc
+CPU_ARCH	= ppc
+endif
+
+# "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 Darwin dynamic libraries.
+
+OS_CFLAGS	= $(DSO_CFLAGS) $(OS_REL_CFLAGS) -Wmost -fpascal-strings -traditional-cpp -fno-common -pipe -DXP_MACOSX -DHAVE_STRERROR -DHAVE_BSD_FLOCK
+
+ARCH		= darwin
+
+# May override this with -bundle to create a loadable module.
+DSO_LDOPTS	= -dynamiclib -compatibility_version 1 -current_version 1
+
+MKSHLIB		= $(CC) -arch $(CPU_ARCH) $(DSO_LDOPTS)
+DLL_SUFFIX	= dylib
+
+G++INCLUDES	= -I/usr/include/g++