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-rw-r--r--Src/zsh_system.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/Src/zsh_system.h b/Src/zsh_system.h
index a9cbf02d0..5339b496f 100644
--- a/Src/zsh_system.h
+++ b/Src/zsh_system.h
@@ -37,7 +37,7 @@
 #endif
 #endif
 
-#if defined(__linux) || defined(__GNU__) || defined(__GLIBC__) || defined(LIBC_MUSL)
+#if defined(__linux) || defined(__GNU__) || defined(__GLIBC__) || defined(LIBC_MUSL) || defined(__CYGWIN__)
 /*
  * Turn on numerous extensions.
  * This is in order to get the functions for manipulating /dev/ptmx.