Ebuilds using imake don't work anymore with ABI=x32:
Imakefile.c:34:0: fatal error: Imake.tmpl: No such file or directory
But file is present:
# find / -type f -name Imake.tmpl
Example of ebuild:
it isn't just ABI=x32. imake stuff appears to have /usr/lib/ hardcoded, so if you build on any system where /usr/lib doesn't point to your native ABI, it'll fail. i hit this while building tightvnc.
symlinking /usr/lib*/X11 /usr/lib/ worked around the issue.
media-libs/nas is the only package in tree that I see that is actually multilib (many packages inherit multilib for get_libdir()) that depends on imake, and it seems to deal with imake's deficiency sufficiently.
imake is basically unmaintained, and the /usr/lib*/X11 lib paths don't exist anymore. Let's WONTFIX since I expect fewer and fewer projects to use imake over time.