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-rw-r--r--tools/Makefile4
1 files changed, 3 insertions, 1 deletions
diff --git a/tools/Makefile b/tools/Makefile
index 9e40bcd27..57a4d84ce 100644
--- a/tools/Makefile
+++ b/tools/Makefile
@@ -1,5 +1,7 @@
.PHONY: all
+CFLAGS := -std=c99
+
all: \
lzcomp \
png_dimensions \
@@ -11,4 +13,4 @@ all: \
@:
%: %.c
- $(CC) -o $@ $<
+ $(CC) $(CFLAGS) -o $@ $<