Error when building 3.21.1 with Sphinx items
I've downloaded the sources for CMake 3.21.1 and tried to build with essentially everything turned on, including the Sphinx-related items. With all prerequisites satisfied, supposedly (and choosing "system version of X" for everything possible), I get:
... snip ...
[ 98%] sphinx-build man: see Utilities/Sphinx/build-man.log
[ 98%] sphinx-build singlehtml: see Utilities/Sphinx/build-singlehtml.log
[ 98%] sphinx-build texinfo: see Utilities/Sphinx/build-texinfo.log
[100%] sphinx-build qthelp: see Utilities/Sphinx/build-qthelp.log
Sphinx error:
Builder name qthelp not registered or available through entry point
make[2]: *** [Utilities/Sphinx/CMakeFiles/documentation.dir/build.make:102: Utilities/Sphinx/doc_format_qthelp] Error 2
I'm using Devuan GNU/Linux 4.0 Chimaera (which is essentially Debian Bullseye without systemd).