I have succeeded, by doing 1) update to the python3.9 you just committed 2) adding this symlink instead my venv lrwxr-xr-x 1 gdt wheel 48 Dec 30 10:21 lib/python3.9/_sysconfigdata__netbsd9_.py -> /usr/pkg/lib/python3.9/_sysconfigdata_netbsd9.py I am not sure that step 1 was needed. Note that in the symlink, the os is netbsd9 in pkgsrc and _netbsd9_ within pip. Thanks for the pointers/help/fix. I'll post again if I get more clarity.
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