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-rw-r--r--Build/source/utils/asymptote/util.cc2
1 files changed, 2 insertions, 0 deletions
diff --git a/Build/source/utils/asymptote/util.cc b/Build/source/utils/asymptote/util.cc
index 228f7596df6..2d66fb2316f 100644
--- a/Build/source/utils/asymptote/util.cc
+++ b/Build/source/utils/asymptote/util.cc
@@ -5,7 +5,9 @@
* A place for useful utility functions.
*****/
+#ifdef __CYGWIN__
#define _POSIX_C_SOURCE 200809L
+#endif
#include <cassert>
#include <iostream>