Function elisp-comp has been deprecated, see bug 235442. elisp-compile should be used instead. Patch will follow.
Created attachment 163916 [details, diff] Proposed change for uim-1.5.2-r1.ebuild Patch for 1.5.2-r1, but please apply to 1.4.2 as well. The installed files will be identical (except for a changed comment in the header of the .elc files).