URW++ OTF only optional?

[Jonas Hahnfeld]

https://gitlab.com/lilypond/lilypond/-/merge_requests/191 switched to
using URW++ / C059 fonts by default. However, it looks like configure
only requires the previous default, TeX Gyre; URW++ / C059 is optional.
Is that intended and / or correct?

On a more general note, I wonder why the build system is installing the
fonts by default. I get that for prebuilt binaries (from GUB), but for
Linux distributions it actually means I have the fonts multiple times
(see below). Is there a compelling reason? AFAICT this was started very
long ago when there was a need to convert available fonts to a format
understood by LilyPond (but my archeology might be completely wrong
here).



 $ ll /usr/share/lilypond/2.20.0/fonts/otf/{C059,Nimbus,texgyre}*
-rw-r--r-- 1 root root 102K 16. Mär 00:01 
/usr/share/lilypond/2.20.0/fonts/otf/C059-BdIta.otf
-rw-r--r-- 1 root root  99K 16. Mär 00:01 
/usr/share/lilypond/2.20.0/fonts/otf/C059-Bold.otf
-rw-r--r-- 1 root root  99K 16. Mär 00:01 
/usr/share/lilypond/2.20.0/fonts/otf/C059-Italic.otf
-rw-r--r-- 1 root root  96K 16. Mär 00:01 
/usr/share/lilypond/2.20.0/fonts/otf/C059-Roman.otf
-rw-r--r-- 1 root root  88K 16. Mär 00:01 
/usr/share/lilypond/2.20.0/fonts/otf/NimbusMonoPS-BoldItalic.otf
-rw-r--r-- 1 root root  86K 16. Mär 00:01 
/usr/share/lilypond/2.20.0/fonts/otf/NimbusMonoPS-Bold.otf
-rw-r--r-- 1 root root  81K 16. Mär 00:01 
/usr/share/lilypond/2.20.0/fonts/otf/NimbusMonoPS-Italic.otf
-rw-r--r-- 1 root root  77K 16. Mär 00:01 
/usr/share/lilypond/2.20.0/fonts/otf/NimbusMonoPS-Regular.otf
-rw-r--r-- 1 root root  86K 16. Mär 00:01 
/usr/share/lilypond/2.20.0/fonts/otf/NimbusSans-BoldItalic.otf
-rw-r--r-- 1 root root  82K 16. Mär 00:01 
/usr/share/lilypond/2.20.0/fonts/otf/NimbusSans-Bold.otf
-rw-r--r-- 1 root root  87K 16. Mär 00:01 
/usr/share/lilypond/2.20.0/fonts/otf/NimbusSans-Italic.otf
-rw-r--r-- 1 root root  81K 16. Mär 00:01 
/usr/share/lilypond/2.20.0/fonts/otf/NimbusSans-Regular.otf
-rw-r--r-- 1 root root  89K 16. Mär 00:01 
/usr/share/lilypond/2.20.0/fonts/otf/texgyrecursor-bolditalic.otf
-rw-r--r-- 1 root root  86K 16. Mär 00:01 
/usr/share/lilypond/2.20.0/fonts/otf/texgyrecursor-bold.otf
-rw-r--r-- 1 root root  86K 16. Mär 00:01 
/usr/share/lilypond/2.20.0/fonts/otf/texgyrecursor-italic.otf
-rw-r--r-- 1 root root  83K 16. Mär 00:01 
/usr/share/lilypond/2.20.0/fonts/otf/texgyrecursor-regular.otf
-rw-r--r-- 1 root root 133K 16. Mär 00:01 
/usr/share/lilypond/2.20.0/fonts/otf/texgyreheros-bolditalic.otf
-rw-r--r-- 1 root root 133K 16. Mär 00:01 
/usr/share/lilypond/2.20.0/fonts/otf/texgyreheros-bold.otf
-rw-r--r-- 1 root root 136K 16. Mär 00:01 
/usr/share/lilypond/2.20.0/fonts/otf/texgyreheros-italic.otf
-rw-r--r-- 1 root root 131K 16. Mär 00:01 
/usr/share/lilypond/2.20.0/fonts/otf/texgyreheros-regular.otf
-rw-r--r-- 1 root root 142K 16. Mär 00:01 
/usr/share/lilypond/2.20.0/fonts/otf/texgyreschola-bolditalic.otf
-rw-r--r-- 1 root root 139K 16. Mär 00:01 
/usr/share/lilypond/2.20.0/fonts/otf/texgyreschola-bold.otf
-rw-r--r-- 1 root root 140K 16. Mär 00:01 
/usr/share/lilypond/2.20.0/fonts/otf/texgyreschola-italic.otf
-rw-r--r-- 1 root root 138K 16. Mär 00:01 
/usr/share/lilypond/2.20.0/fonts/otf/texgyreschola-regular.otf

 $ ll /usr/share/fonts/gsfonts/C059-*
-rw-r--r-- 1 root root 102K 16. Mai 13:20 
/usr/share/fonts/gsfonts/C059-BdIta.otf
-rw-r--r-- 1 root root  99K 16. Mai 13:20 /usr/share/fonts/gsfonts/C059-Bold.otf
-rw-r--r-- 1 root root  99K 16. Mai 13:20 
/usr/share/fonts/gsfonts/C059-Italic.otf
-rw-r--r-- 1 root root  96K 16. Mai 13:20 
/usr/share/fonts/gsfonts/C059-Roman.otf
 $ ll /usr/share/fonts/gsfonts/{NimbusMonoPS,NimbusSans}-*.otf
-rw-r--r-- 1 root root 88K 16. Mai 13:20 
/usr/share/fonts/gsfonts/NimbusMonoPS-BoldItalic.otf
-rw-r--r-- 1 root root 86K 16. Mai 13:20 
/usr/share/fonts/gsfonts/NimbusMonoPS-Bold.otf
-rw-r--r-- 1 root root 81K 16. Mai 13:20 
/usr/share/fonts/gsfonts/NimbusMonoPS-Italic.otf
-rw-r--r-- 1 root root 77K 16. Mai 13:20 
/usr/share/fonts/gsfonts/NimbusMonoPS-Regular.otf
-rw-r--r-- 1 root root 86K 16. Mai 13:20 
/usr/share/fonts/gsfonts/NimbusSans-BoldItalic.otf
-rw-r--r-- 1 root root 82K 16. Mai 13:20 
/usr/share/fonts/gsfonts/NimbusSans-Bold.otf
-rw-r--r-- 1 root root 87K 16. Mai 13:20 
/usr/share/fonts/gsfonts/NimbusSans-Italic.otf
-rw-r--r-- 1 root root 81K 16. Mai 13:20 
/usr/share/fonts/gsfonts/NimbusSans-Regular.otf
 $ ll /usr/share/fonts/tex-gyre/texgyre{cursor,heros,schola}-*.otf
-rw-r--r-- 1 root root  89K 16. Mai 11:59 
/usr/share/fonts/tex-gyre/texgyrecursor-bolditalic.otf
-rw-r--r-- 1 root root  86K 16. Mai 11:59 
/usr/share/fonts/tex-gyre/texgyrecursor-bold.otf
-rw-r--r-- 1 root root  86K 16. Mai 11:59 
/usr/share/fonts/tex-gyre/texgyrecursor-italic.otf
-rw-r--r-- 1 root root  83K 16. Mai 11:59 
/usr/share/fonts/tex-gyre/texgyrecursor-regular.otf
-rw-r--r-- 1 root root 133K 16. Mai 11:59 
/usr/share/fonts/tex-gyre/texgyreheros-bolditalic.otf
-rw-r--r-- 1 root root 133K 16. Mai 11:59 
/usr/share/fonts/tex-gyre/texgyreheros-bold.otf
-rw-r--r-- 1 root root 136K 16. Mai 11:59 
/usr/share/fonts/tex-gyre/texgyreheros-italic.otf
-rw-r--r-- 1 root root 131K 16. Mai 11:59 
/usr/share/fonts/tex-gyre/texgyreheros-regular.otf
-rw-r--r-- 1 root root 142K 16. Mai 11:59 
/usr/share/fonts/tex-gyre/texgyreschola-bolditalic.otf
-rw-r--r-- 1 root root 139K 16. Mai 11:59 
/usr/share/fonts/tex-gyre/texgyreschola-bold.otf
-rw-r--r-- 1 root root 140K 16. Mai 11:59 
/usr/share/fonts/tex-gyre/texgyreschola-italic.otf
-rw-r--r-- 1 root root 138K 16. Mai 11:59 
/usr/share/fonts/tex-gyre/texgyreschola-regular.otf

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