When you prepare to compile media-sound/lilypond-2.10.33 with gcc-4.3.1 you have to add three includes, else it will fail. I attached a patch. Reproducible: Always Steps to Reproduce:
Created attachment 158331 [details, diff] lilypond-2.10.33+gcc-4.3.1.patch Patch to compile lilypond-2.10.33 with gcc >= 4.3
For the installation problem see: http://bugs.gentoo.org/show_bug.cgi?id=228823
*** This bug has been marked as a duplicate of bug 214594 ***
Sorry for the duplicate, but I do not visit the bug report. "media-sound/lilypond-2.11.42 version bump + gcc-4.3 patch" I did not think (because of the title) that I can find a patch for the v2.10.33 there.