The error is from PangoFont, and AFAIK that means it's using freetype (xft) and fontconfig under pango.
$ ldd /usr/bin/ghemical | grep font
libfontconfig.so.1 => /usr/lib/x86_64-linux-gnu/libfontconfig.so.1
(0x00007fb7b9691000)
THAT means all you need do is change "Courier 12" to "Monospace", the
fontconfig alias for the 'best' available fixed-width font.
The default size is 12pt, so "Monospace-12" or "Monospace 12"
shouldn't be needed.
src/p1dview_wcl.cpp:171: ogl_InitPangoFont("courier 12");
src/eldview_wcl.cpp:135: ogl_InitPangoFont("courier 12");
src/oglview_wcl.cpp:929: ogl_InitPangoFont("courier 12");
src/p2dview_wcl.cpp:207: ogl_InitPangoFont("courier 12");
src/gpcview_wcl.cpp:61: ogl_InitPangoFont("courier 12");
If you're really paranoid, you could also add
Depends: ttf-dejavu-core
I don't have the time or interest to test this theory myself.
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