Gave up building GTK+ and wxGTK under MSys, now trying to do Code::Blocks under Cygwin wxGTK.
Looks like wxWidgets requires major changes to get wxGTK to compile under MinGW MSys. I think I could get GTK+ to compile under MinGW MSys with about a week worth of work, but it is so much easier to just download the finished binary and development file so gave up on that.
Tim S
Code::Blocks Patches needed for CygWin wxGTK build. This is not the complete list, still trying to make it. I got a whole bunch of link errors relating to wxScintilla. Going to try an wxWidgets 2.6.3 build next.
The missing WXMAKINGDLL_SCI just like your build.
Index: src/sdk/wxscintilla/Makefile.am
===================================================================
--- src/sdk/wxscintilla/Makefile.am (revision 3989)
+++ src/sdk/wxscintilla/Makefile.am (working copy)
@@ -3,7 +3,7 @@
-I$(srcdir)/src/scintilla/include \
-I$(srcdir)/src/scintilla/src
-AM_CPPFLAGS = -DSCI_LEXER -DLINK_LEXERS -DGTK
+AM_CPPFLAGS = -DSCI_LEXER -DLINK_LEXERS -DGTK -DWXMAKINGDLL_SCI
noinst_LTLIBRARIES = libwxscintilla.la