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-rw-r--r--configure.ac2
1 files changed, 1 insertions, 1 deletions
diff --git a/configure.ac b/configure.ac
index f523ece..e16ab97 100644
--- a/configure.ac
+++ b/configure.ac
@@ -22,7 +22,7 @@ PKG_CHECK_MODULES(SDL, sdl2,
AM_CONDITIONAL(ENABLE_ROTOTILLER, [test "x$build_rototiller" = xtrue])
LIBS="$DRM_LIBS $SDL_LIBS $LIBS"
-CFLAGS="$DRM_CFLAGS $SDL_CFLAGS $CFLAGS"
+CFLAGS="$DRM_CFLAGS $SDL_CFLAGS $CFLAGS -D_GNU_SOURCE"
AX_PTHREAD
LIBS="$PTHREAD_LIBS $LIBS"
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