Index: b/usr/src/lib/libm/Makefile.libm.com
===================================================================
--- a/usr/src/lib/libm/Makefile.libm.com
+++ b/usr/src/lib/libm/Makefile.libm.com
@@ -53,6 +53,11 @@ CPPFLAGS	+= -I$(LIBMSRC)/C \
 CFLAGS		+= -_gcc=-D__C99FEATURES__
 CFLAGS64	+= -_gcc=-D__C99FEATURES__
 
+
+# for __inline__
+CFLAGS		+= -_gcc=-fgnu89-inline
+CFLAGS64	+= -_gcc=-fgnu89-inline
+
 # libm depends on integer overflow characteristics
 CFLAGS		+= -_gcc=-fno-strict-overflow
 CFLAGS64	+= -_gcc=-fno-strict-overflow