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-rw-r--r--libc/string/i386/memchr.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/libc/string/i386/memchr.c b/libc/string/i386/memchr.c
index 772251cee..c2fc44b4a 100644
--- a/libc/string/i386/memchr.c
+++ b/libc/string/i386/memchr.c
@@ -55,7 +55,7 @@ void *memchr(const void *s, int c, size_t count)
#ifndef memchr
libc_hidden_def(memchr)
#else
-/* Uncomment TESTING, gcc -D__USE_GNU -m32 -Os memchr.c -o memchr
+/* Uncomment TESTING, gcc -D_GNU_SOURCE -m32 -Os memchr.c -o memchr
* and run ./memchr
*/
int main()