diff --git a/lib/Makefile.netware b/lib/Makefile.netware
index 642f051d6..a4f6ebb65 100644
--- a/lib/Makefile.netware
+++ b/lib/Makefile.netware
@@ -146,7 +146,10 @@ ARFLAGS	= -cq
 LIBEXT	= a
 RANLIB	= ranlib
 CFLAGS  += -m32
-CFLAGS	+= -fno-builtin -fpcc-struct-return -fno-strict-aliasing
+CFLAGS	+= -fno-builtin -fno-strict-aliasing
+ifeq ($(findstring gcc,$(CC)),gcc)
+CFLAGS	+= -fpcc-struct-return
+endif
 CFLAGS	+= -Wall # -pedantic
 ifeq ($(LIBARCH),LIBC)
 ifeq ($(POSIXFL),1)
diff --git a/src/Makefile.netware b/src/Makefile.netware
index ebfbcb5f0..b801f3be0 100644
--- a/src/Makefile.netware
+++ b/src/Makefile.netware
@@ -141,7 +141,10 @@ LD	= nlmconv
 LDFLAGS	= -T
 LIBEXT	= a
 CFLAGS	+= -m32
-CFLAGS	+= -fno-builtin -fpcc-struct-return -fno-strict-aliasing
+CFLAGS  += -fno-builtin -fno-strict-aliasing
+ifeq ($(findstring gcc,$(CC)),gcc)
+CFLAGS  += -fpcc-struct-return
+endif
 CFLAGS	+= -Wall # -pedantic
 ifeq ($(LIBARCH),LIBC)
 ifeq ($(POSIXFL),1)