performous: FTBFS on ppc64el

Imported from Debian bug http://bugs.debian.org/1010095:

Source: performous
Version: 1.1+git20181118-5
Severity: serious
Tags: ftbfs sid bookworm
Justification: fails to build from source (but built successfully in the past)
X-Debbugs-Cc: <email address hidden>

performous FTBFS on ppc64el:

cd /<<PKGBUILDDIR>>/obj-powerpc64le-linux-gnu && /usr/bin/cmake -E cmake_depends "Unix Makefiles" /<<PKGBUILDDIR>> /<<PKGBUILDDIR>>/docs/man /<<PKGBUILDDIR>>/obj-powerpc64le-linux-gnu /<<PKGBUILDDIR>>/obj-powerpc64le-linux-gnu/docs/man /<<PKGBUILDDIR>>/obj-powerpc64le-linux-gnu/docs/man/CMakeFiles/gh_fsb_decrypt.1.dir/DependInfo.cmake --color=
In file included from /usr/include/c++/11/bits/stl_algobase.h:63,
                 from /usr/include/c++/11/memory:63,
                 from /<<PKGBUILDDIR>>/ced/compact_enc_det/compact_enc_det.cc:24:
/usr/include/c++/11/ext/numeric_traits.h:222:38: error: ‘__ieee128’ was not declared in this scope; did you mean ‘__int128’?
  222 | struct __numeric_traits_floating<__ieee128>
      | ^~~~~~~~~
      | __int128
154 translated messages, 20 fuzzy translations, 138 untranslated messages.
/usr/include/c++/11/ext/numeric_traits.h:222:47: error: template argument 1 is invalid
  222 | struct __numeric_traits_floating<__ieee128>
      | ^
make[3]: Leaving directory '/<<PKGBUILDDIR>>/obj-powerpc64le-linux-gnu'
/usr/include/c++/11/ext/numeric_traits.h:230:29: error: ‘__ieee128’ was not declared in this scope; did you mean ‘__int128’?
  230 | struct __numeric_traits<__ieee128>
      | ^~~~~~~~~
      | __int128
/usr/include/c++/11/ext/numeric_traits.h:230:38: error: template argument 1 is invalid
  230 | struct __numeric_traits<__ieee128>
      | ^
make[3]: Leaving directory '/<<PKGBUILDDIR>>/obj-powerpc64le-linux-gnu'
make -f docs/man/CMakeFiles/ss_chc_decode.1.dir/build.make docs/man/CMakeFiles/ss_chc_decode.1.dir/build
make[3]: Entering directory '/<<PKGBUILDDIR>>/obj-powerpc64le-linux-gnu'
/usr/include/c++/11/ext/numeric_traits.h:231:40: error: ‘__ieee128’ was not declared in this scope; did you mean ‘__int128’?
  231 | : public __numeric_traits_floating<__ieee128>
      | ^~~~~~~~~
      | __int128
/usr/include/c++/11/ext/numeric_traits.h:231:49: error: template argument 1 is invalid
  231 | : public __numeric_traits_floating<__ieee128>
      | ^
make[3]: Leaving directory '/<<PKGBUILDDIR>>/obj-powerpc64le-linux-gnu'

See
https://buildd.debian.org/status/fetch.php?pkg=performous&arch=ppc64el&ver=1.1%2Bgit20181118-5%2Bb1&stamp=1650784603&raw=0

Cheers
--
Sebastian Ramacher