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-rw-r--r--pugl/detail/x11.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/pugl/detail/x11.c b/pugl/detail/x11.c
index d959dbf..e3fb264 100644
--- a/pugl/detail/x11.c
+++ b/pugl/detail/x11.c
@@ -37,6 +37,7 @@
#ifdef HAVE_XSYNC
# include <X11/extensions/sync.h>
+# include <X11/extensions/syncconst.h>
#endif
#include <sys/select.h>