#if wxUSE_SOCKETS || defined(__GSOCKET_STANDALONE__)
#include <stddef.h>
-#ifndef __WXMAC__
+
+/*
+ Including sys/types.h under cygwin results in the warnings about "fd_set
+ having been defined in sys/types.h" when winsock.h is included later and
+ doesn't seem to be necessary anyhow. It's not needed under Mac neither.
+ */
+#if !defined(__WXMAC__) && !defined(__CYGWIN__)
#include <sys/types.h>
#endif