Wavemon is a another package that does not compile with tinfo use-flag of ncurses enabled as wavemon does not link against libtinfo if needed. Hence, this bug is of the type summarized in bug #457530. The attached patch uses pkg-config to determine flags for ncurses.
Created attachment 371770 [details, diff]
Patch configure.ac to use pkg-config for ncurses libs
+ 06 Mar 2014; Sergey Popov <email@example.com> wavemon-0.7.5.ebuild,
+ Bump EAPI to 5, fix building with sys-libs/ncurses[tinfo], wrt bug #503494,
+ thanks to Stefan Huber <shuber-bgo AT sthu.org>