void WXDLLEXPORT wxStripExtension(wxString& buffer);
// Get a temporary filename, opening and closing the file.
-char* WXDLLEXPORT wxGetTempFileName(const wxString& prefix, char *buf = NULL);
+char* WXDLLEXPORT wxGetTempFileName(const wxString& prefix, char *buf = (char *) NULL);
// Expand file name (~/ and ${OPENWINHOME}/ stuff)
char* WXDLLEXPORT wxExpandPath(char *dest, const char *path);
// copies into buf.
// IMPORTANT NOTE getcwd is know not to work under some releases
// of Win32s 1.3, according to MS release notes!
-char* WXDLLEXPORT wxGetWorkingDirectory(char *buf = NULL, int sz = 1000);
+char* WXDLLEXPORT wxGetWorkingDirectory(char *buf = (char *) NULL, int sz = 1000);
// Set working directory
bool WXDLLEXPORT wxSetWorkingDirectory(const wxString& d);