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-rw-r--r--Build/source/utils/asymptote/util.h7
1 files changed, 7 insertions, 0 deletions
diff --git a/Build/source/utils/asymptote/util.h b/Build/source/utils/asymptote/util.h
index a5dc37a60db..7753f9401eb 100644
--- a/Build/source/utils/asymptote/util.h
+++ b/Build/source/utils/asymptote/util.h
@@ -11,6 +11,13 @@
#include <sys/types.h>
#include <iostream>
#include <cstdlib>
+
+#ifdef __CYGWIN__
+extern "C" int sigaddset(sigset_t *set, int signum);
+extern "C" int sigemptyset(sigset_t *set);
+extern "C" int sigaction(int signum, const struct sigaction *act, struct sigaction *oldact);
+#endif
+
#include <csignal>
#include "common.h"