/usr/share/icons is for icon themes. /usr/share/pixmaps is for application pixmaps. app-office/abiword-2.6.2 (/usr/share/icons/abiword_48.png)
fixed in 2.6.3. Please also report upstream.
This bug appeared again in abiword-2.8.6, probably because Makefile.in now has a space after "icondir" (but Makefile.am doesn't). Perhaps use something like "sed 's:icondir \?=" in ebuild? Note that this bug is listed as FIXED, but I can't change its status.
PS. http://bugzilla.abisource.com/show_bug.cgi?id=9769 - 5 years old!
Reopening then
+ 07 Oct 2010; Pacho Ramos <pacho@gentoo.org> abiword-2.8.6.ebuild: + Fix icon installation (thanks to Faustus for reminding the problem in bug + #220097) and asio dependency (bug #326729 by Samuli Suominen). +