fontforge version detection fails during build

[Markus Oehme]

Hello,

I have the same problem reported by Kyrylo Shpytsya a month ago. The version
detection for fontforge fails during the build despite fontforge being
installed.

ERROR: Please install required programs:  /usr/bin/fontforge >= 20110222 
(installed: )

I'm using Gentoo ~amd64. I have fontforge-20190317 and lilypond-2.19.80
installed and trying to rebuild lilypond fails. There exists a Gentoo bug
for this issue at [1] (not by me).

Please let me know if you need any additional information

           Markus

[1] https://bugs.gentoo.org/681630

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