diff --git a/lib/Makefile.netware b/lib/Makefile.netware
index 642f051d665cab988fbc5fe1180b6322201cbd9a..a4f6ebb657955dfef499510079cd08b698908a22 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 ebfbcb5f03dc031c4ad3c20fc6e67b53f0b9f73c..b801f3be063ee6ed84fc89cc4e13bce084737c17 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)