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This command rebuilds the file MANIFEST:

python setup.py sdist --manifest-only

But then build complains about missing files:

python setup.py build
running build

*** SOURCE ERROR: There are files missing (245/250 found)!
Missing: roundup-admin
Missing: roundup-demo
Missing: roundup-gettext
Missing: roundup-mailgw
Missing: roundup-server

I don't know why sdist put these lines, remove the 5 lines
starting with roundup- in the file MANIFEST and build works