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-rw-r--r--stdlib/Makefile1
1 files changed, 1 insertions, 0 deletions
diff --git a/stdlib/Makefile b/stdlib/Makefile
index c7493cdac1..0d4cc060cc 100644
--- a/stdlib/Makefile
+++ b/stdlib/Makefile
@@ -160,6 +160,7 @@ $(objpfx)isomac.out: $(objpfx)isomac
 	$(dir $<)$(notdir $<) '$(CC)'  \
 	'-I../include -I.. $(+sysdep-includes) $(sysincludes)' > $<.out
 
+isomac-CFLAGS = -O
 $(objpfx)isomac: isomac.c
 	$(native-compile)