class WXDLLIMPEXP_FWD_BASE wxProcess;
class wxStreamTempInputBuffer;
-#if defined(__UNIX__)
+// some ports have toolkit-specific implementations of wxAddProcessCallback()
+// but by default we use a generic wxFDIOHandler-based mechanism under Unix
+#if defined(__UNIX__) && \
+ !(defined(__WXGTK__) || defined(__WXMOTIF__) || defined(__WXMGL__))
#define wxHAS_GENERIC_PROCESS_CALLBACK 1
#endif