/usr/bin/lttng-gen-tp is a python script that starts with a shebang "#!/usr/bin/env python", so executing this script with dev-lang/python-exec[-native-symlinks] will fail. Reproducible: Always Steps to Reproduce: 1.use dev-lang/python-exec[-native-symlinks] 2.execute /usr/bin/lttng-gen-tp 3./usr/bin/env: 'python': No such file or directory Found on https://bugs.gentoo.org/932783
The proper fix for this is to use python-single-r1 and then fix the shebangs.