check for header availability

diff --git a/ext/zip/lib/mkstemp.c b/ext/zip/lib/mkstemp.c
index 57d88484911b074549e18784062f6c03bb1744a7..ccd8da855edbaf8f77bafa0df7dd0febf0c064fe 100644 (file)
--- a/ext/zip/lib/mkstemp.c
+++ b/ext/zip/lib/mkstemp.c
@@ -43,7 +43,9 @@
 #endif
 #include <stdio.h>
 #include <stdlib.h>
+#ifdef _WIN32
 #include <unistd.h>
+#endif
 
 #ifndef O_BINARY
 #define O_BINARY 0