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-rw-r--r--Src/Modules/tcp.h4
1 files changed, 2 insertions, 2 deletions
diff --git a/Src/Modules/tcp.h b/Src/Modules/tcp.h
index 36ceb0886..231267e22 100644
--- a/Src/Modules/tcp.h
+++ b/Src/Modules/tcp.h
@@ -46,9 +46,9 @@
  * __USE_LARGEFILE.  This means the problem is somewhere in the
  * header files where we can't get at it.  For now, revert to
  * not including this file only on systems where we know it's missing.
- * Currently this is just cygwin.
+ * Currently this is just some older versions of cygwin.
  */
-#ifndef __CYGWIN__
+#if defined(HAVE_NETINET_IN_SYSTM_H) || !defined(__CYGWIN__)
 # include <netinet/in_systm.h>
 #endif
 #include <netinet/in.h>