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-rw-r--r--css/ruleset.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/css/ruleset.c b/css/ruleset.c
index 3b5fb164e..99cb57b86 100644
--- a/css/ruleset.c
+++ b/css/ruleset.c
@@ -18,6 +18,7 @@
* any of it to be used.
*/
+#define _GNU_SOURCE /* for strndup */
#include <assert.h>
#include <stdbool.h>
#include <stdlib.h>