diff --git a/library/GNUmakefile.os4 b/library/GNUmakefile.os4
index c7554e3..e6caed0 100644
--- a/library/GNUmakefile.os4
+++ b/library/GNUmakefile.os4
@@ -1,5 +1,5 @@
 #
-# $Id: GNUmakefile.os4,v 1.57 2005-05-12 13:21:43 obarthel Exp $
+# $Id: GNUmakefile.os4,v 1.58 2005-05-12 15:07:22 obarthel Exp $
 #
 # :ts=8
 #
@@ -110,8 +110,8 @@ WARNINGS = \
 #	-Wconversion -Wshadow
 
 INCLUDES = -Iinclude -I. -I$(SDK_INCLUDE)
-#OPTIONS = -D__THREAD_SAFE -DNDEBUG -DUSE_64_BIT_INTS -D__USE_INLINE__ -Wa,-mregnames -fno-common
- OPTIONS =                 -DNDEBUG -DUSE_64_BIT_INTS -D__USE_INLINE__ -Wa,-mregnames -fno-common
+#OPTIONS = -D__THREAD_SAFE -DNDEBUG -DUSE_64_BIT_INTS -D__USE_INLINE__ -Wa,-mregnames -fno-common -std=gnu99
+ OPTIONS =                 -DNDEBUG -DUSE_64_BIT_INTS -D__USE_INLINE__ -Wa,-mregnames -fno-common -std=gnu99
 OPTIMIZE = -O3
 #DEBUG = -ggdb