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-rw-r--r--Build/source/utils/asymptote/glew.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/Build/source/utils/asymptote/glew.c b/Build/source/utils/asymptote/glew.c
index bea419ea8a7..4bdea46b606 100644
--- a/Build/source/utils/asymptote/glew.c
+++ b/Build/source/utils/asymptote/glew.c
@@ -2,6 +2,10 @@
#include "config.h"
#endif
+#ifdef __MSDOS__
+#define _WIN32
+#endif
+
#ifdef HAVE_LIBGL
#include "GL/glew.c"
#endif /* HAVE_LIBGL */