Comment 14 for bug 221065

mkcomposecache is a binary utility, maybe it just seemed inappropriate to put it into a library?

The code looks pretty antique; it still uses Imake...! The code will need to be updated to current, given a new makefile, integrated somewhere (maybe it'd fit better into x11-xserver-utils?) and tested out thoroughly.

I'm also wondering whether mkcomposecache is actually necessary. From the blog post above it sort of sounds like simply creating the directory is sufficient, maybe that's something we all could test out... Looks like it expects this to be located at /var/cache/libx11/compose/