nano-2.x needs sys-libs/slang-2.x and a patch s/slang/slang-2/ when build against slang. Reproducible: Always Steps to Reproduce:
Created attachment 139564 [details, diff] nano-2.0.7/configure.ac s/slang/slang-2/
also depends on bug 141947
Created attachment 139566 [details, diff] nano-2.0.7 changes
Created attachment 139567 [details] nano-2.0.7.ebuild
Bug 141947 is not relevant as noted in the comments on that bug already if slang-2 is a pile of crap in Gentoo, then i'd just as soon punt USE=slang from nano. it's inferior anyways to ncurses.
(In reply to comment #5) > if slang-2 is a pile of crap in Gentoo, then i'd just as soon punt USE=slang It works, the lib is just renamed (in gentoo) from libslang to libslang-2 (slot=2).
Please see bug 209416
verified that sys-libs/slang-2.1.3 is sane and nano works with it as is.