diff --git a/thirdparty/libtiff/test_inline.c b/thirdparty/libtiff/test_inline.c
index ad25a9c6..db0d056c 100644
--- a/thirdparty/libtiff/test_inline.c
+++ b/thirdparty/libtiff/test_inline.c
@@ -3,8 +3,3 @@ typedef int foo_t;
 static inline foo_t static_foo(){return 0;}
 foo_t foo(){return 0;}
 int main(int argc, char *argv[]){return 0;}
-/* Test source lifted from /usr/share/autoconf/autoconf/c.m4 */
-typedef int foo_t;
-static inline foo_t static_foo(){return 0;}
-foo_t foo(){return 0;}
-int main(int argc, char *argv[]){return 0;}