Same as #40953 and #40347, but affects qmamecat. Here's the patch, copied from xxdiff.
Created attachment 25289 [details, diff]
perhaps better way is to figure out a way of inherit-ing kde eclass and addwrite to it
Created attachment 25350 [details, diff]
Ebuild patch v2
This patch acknowledges SpanKY's suggestion. Should work for every ebuild with
the same problem. The "none" argument to kde_src_compile prevents it to default
to "all" and does just nothing! :)
Applied to the ebuild. Thanks for the patch and bug report.