Builds problems affect kerning pairs

[ghost]

Using fontforge to build the fonts, I get a bunch of errors:

Skipping non-existent glyph A' in group @MMK_L_A.
Skipping non-existent glyph A.c2' in group @MMK_L_A.c2.
Skipping non-existent glyph Aacute.c2' in group @MMK_L_Aacute.c2.
Skipping non-existent glyph Adieresis.c2' in group @MMK_L_Adieresis.c2.
…

This has the effect of causing it to not build most of the kerning pairs.

The root cause is that many of the glyph names in groups.list have a ' added to them. I've changed this in my own copy, but I'm unsure as to the reason for this. Is there some software in which it works?

[skinpop]

Similar issue here, I'm not finding any kerning tables in the ttf files.