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-rw-r--r--Build/source/utils/asymptote/glrender.cc2
1 files changed, 2 insertions, 0 deletions
diff --git a/Build/source/utils/asymptote/glrender.cc b/Build/source/utils/asymptote/glrender.cc
index 7698798e951..9214c19a133 100644
--- a/Build/source/utils/asymptote/glrender.cc
+++ b/Build/source/utils/asymptote/glrender.cc
@@ -4,7 +4,9 @@
* Render 3D Bezier paths and surfaces.
*****/
+#ifdef __CYGWIN__
#define _POSIX_C_SOURCE 200809L
+#endif
#include <stdlib.h>
#include <fstream>