libX11 1.7.3 tarball is missing ax_gcc_builtin.m4
Presumably an incomplete autotools run before make dist?
./configure: line 21761: syntax error near unexpected token `__builtin_popcountl' ./configure: line 21761: `AX_GCC_BUILTIN(__builtin_popcountl)'
Reproduced on Fedora 34 and current Rawhide
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