The myconf variable is missing in the ebuild compile section for fltk-1.0.11-r1.ebuild. Because this, the emerge do not create the shared libs for this library (libfltk.so.1). You must to include ${myconf} in the end for ./configure sentence in the compile section.
Created attachment 438 [details] Fixed ebuild, including myconf var in the compile section. Maybe, this ebuild will be -r2 version. Really it is a minor change.
Fixed (also in 1.1 beta). Thanks for the catch strusberg! Also, fixed SRC_URI in 1.0.11. FYI: for small fixes to existing ebuilds, it is nicer to attach a patch file so the changes can be easily identified. Is there a reason why you commented out the 'use opengl' configuration check in your attached ebuild? FYI2: I'm bumping the ebuild -r* versions. My rational for doing this is so that other users of fltk not aware of this bug will get an automatic update to the shared libs when doing a emerge --world update. If the change was cosmetic and not functional, I would not have bumped the revisions.