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-rw-r--r--Src/system.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/Src/system.h b/Src/system.h
index 558508d2d..f03d890c4 100644
--- a/Src/system.h
+++ b/Src/system.h
@@ -675,6 +675,7 @@ extern short ospeed;
 #endif
 
 #ifdef __CYGWIN__
+# include <sys/cygwin.h>
 # define IS_DIRSEP(c) ((c) == '/' || (c) == '\\')
 #else
 # define IS_DIRSEP(c) ((c) == '/')