... commands¹

Microsoft Windows users can have a look at
https://sourceforge.net/p/healpix/wiki/Windows%20and%20peazip/

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... set²

In particular, the Intel Fortran Compiler, available for free for Linux systems with Intel-like processors, have specific tuning options for each Intel processor family and instructions set. Please consult the online help (ifort -help) or PDF documentation (/opt/intel/composer*/Documentation/en_US/Release_NotesF.pdf) or HTML documentation ( /opt/intel/composer*/Documentation/en_US/documentation_f.htm) for further information.

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...PKG_CONFIG_PATH³

a third option is provide the location of the .pc file in full at each pkg-config invocation : eg
pkg-config -–cflags -–libs full_path/healpix.pc

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... 19.*⁴

problems have been reported with one of the code (sky_ng_sim) when compiled with ifort 14.0.1.106

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... results⁵

All the caveats listed below have been noticed in GDL 0.9.7 (released in Jan 2017), 0.9.8 (March 2018), 0.9.9 (Nov 2018) and 1.0.1 (Oct 2021) and may be solved in subsequent versions. Please send all your questions on GDL and/or its installation directly to GDL developpers at https://github.com/gnudatalanguage/gdl/issues.

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