bug#53064: pioneer FTBFS

[Stephen Paul Weber]

Hello,

Today I tried to `guix install pioneer` and it seems there is no substitute.  It
very quickly fails to build from source with this error in log:

-- Checking for module 'sigc++-2.0'
--   No package 'sigc++-2.0' found
CMake Error at 
/gnu/store/aain9m7r37jlzd21kvgvrkhc2pm7mk1w-cmake-minimal-3.21.3/share/cmake-3.21/Modules/FindPkgConfig.cmake:562
 (message):
  A required package was not found

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