HEALPIX Gnu Data Language instruction notice for Mageia
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The healpix GDL/IDL routines are installed in the default GDL library
directory:

  /usr/share/gnudatalanguage/lib/healpix

together with a startup configuration file, "HEALPIX_startup.gdl"
installed in

 /usr/share/gnudatalanguage

which automatically updates the GDL path to look for them. This
configuration file needs to be loaded by specifying both the HEALPIX
and GDL_STARTUP environment variables:

  export HEALPIX=/usr
  export GDL_STARTUP=/usr/share/gnudatalanguage/HEALPIX_startup.gdl

Adding the two above lines to your shell (e.g. ~/.bashrc) should be enough
to get the whole set of healpix routines available each time you start GDL.