// When using configure, the path must be "zlib.h" I don't know
// what other ports (wxMac, wxMotif without configure) need here.
-
-#ifdef __WXMSW__
+// If we are building with configure (defines __WX_SETUP_H__),
+// we trust the zlib path is given as a -I option.
+#if defined(__WXMSW__) && !defined(__WX_SETUP_H__)
#include "..\zlib\zlib.h"
#else
#include "zlib.h"