<windows.h>. Replaced with a typedef to WNDPROC or FARPROC (depending on whether STRICT mode is being used). Change proposed by Christoph Schulz git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_2_2_BRANCH@7105 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775