Barry: What is the download cache?
I have a guess. If you are installing with the setuptools "install" command, then the things which are "install_requires" get installed into some target location, but things which are build_requires get installed into the PWD. (If you don't specify a target, then it is the system site-packages. In my build system [1], we typically don't use "install" and instead use "develop" with a --prefix argument which specifies the target. I assume virtualenv does something similar.)
Therefore, a later build will have its install_requires already satisfied (if it is using the same installation target), but its build_requirements will not be satisfied.
If that's what's going on then a solution might involve pre- installing setuptools_bzr onto the build system, or patching setuptools to specify a location for build requirements and re-using that location.
Regards, Zooko [1] http://allmydata.org/trac/tahoe/browser/setup.cfg _______________________________________________ Distutils-SIG maillist - Distutils-SIG@python.org http://mail.python.org/mailman/listinfo/distutils-sig
