I've installed gtkmm-2.4.8, seems that the configure-script doesn't find it. checking for gtkmm-2.0 >= 2.2.5 libgnomecanvas-2.0 >= 1.113.0... Package gtkmm-2.0 was not found in the pkg-config search path. Perhaps you should add the directory containing `gtkmm-2.0.pc' to the PKG_CONFIG_PATH environment variable No package 'gtkmm-2.0' found configure: error: Library requirements (gtkmm-2.0 >= 2.2.5 libgnomecanvas-2.0 >= 1.113.0) not met; consider adjusting the PKG_CONFIG_PATH environment variable if your libraries are in a nonstandard prefix so pkg-config can find them.
What do you mean by "the configure-script doesn't find it" ? It seems the package you're trying to install depends on gtkmm-2.2 which is != gtkmm-2.4 Just emerge gtkmm-2.2.12 and you'd be fine.
Created attachment 48309 [details, diff] depfix.patch patch to fix incorrect depcheck and description of libgnomecanvasmm-2.0.1.ebuild
this was fixed by foser on 17 Jan 2005 (according to changelog). this bug can be closed I think.
guess so