Fix missing unistd.h header for Cygwin build

Blackhex · Blackhex · commit 98768eba23e5 · 2025-06-26T19:50:01.000+02:00
diff --git a/gzguts.h b/gzguts.h
@@ -66,6 +66,7 @@
 #endif
 
 #if defined(__CYGWIN__)
+#include <unistd.h>
 #  ifndef HAVE_VSNPRINTF
 #    define HAVE_VSNPRINTF
 #  endif
