[gnuastro-devel] [bug #47868] Check Ghostscript version at ./configure time

[Mohammad Akhlaghi]

Follow-up Comment #8, bug #47868 (project gnuastro):

When the version of Ghostscript is 9.05, the version test we had initially
implemented wasn't successful (so `make check' would give a FAILed result for
the `convertt/fitstopdf.sh' test). 

Since GNU Autoconf Archives already had a very thoroughly tested version
checking tool (as explained below), its ax_compare_version.m4 is now used to
check Ghostscript's version. It works nicely and is able to tell that 9.05 is
less than 9.10 and so `make check' will SKIP that test. This .m4 file was also
included in bootstrap.conf so it will be automatically prepared upon
bootstrapping.

This change has been merged with master.

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