installed the compile tools, and ran configure, but it broke because I apparently don't have a /usr/local/include/tcl8.5/tools/genStub.tcl ...
From all I know, ActiveTcl does not provide a source installation including private headers, genStub.tcl & friends. But you got your answer already in https://groups.google.com/forum/?fromgroups#!topic/comp.lang.tcl/APlqIM_kyKY.
FWIW, ActiveTcl does include internal headers, and I have compiled extensions using mingw against ActiveTcl without issue (though not tried xotcl recently).
Ah ok, my bad then. I will check it ...
Best //stefan