"G:\USR\BIN\PYTHON.EXE" "G:/ux2bs/workdir/Zope-2.7.2-0/setup.py" install \ --prefix="/usr/local/Zope" --build-base="G:/ux2bs/workdir/Zope-2.7.2-0/build-base/python-2.3" --build-lib="G:/ux2bs/workdir/Zope-2.7.2-0/build-base/python-2.3/build-lib" --build-scripts="G:/ux2bs/workdir/Zope-2.7.2-0/build-base/python-2.3/build-scripts" --build-temp="G:/ux2bs/workdir/Zope-2.7.2-0/build-base/python-2.3/build-temp" invalid command name '' make: *** [install] Error 1 I had the same problem, got around it by removing the makefile variable that keeps all the '--build*' parameters and putting them in manually at that step. I was then able to get the build to complete in the ux2bs environment; however, the build does not seem to startup for me. I think one of the '--build*' vars has an extra newline in it that is triggering this error, but since I had not tried any other Zope version on OS/2, I gave up at that point.