Check the attached build log.
Created attachment 167594 [details] Build log
+ 11 May 2009; Samuli Suominen <ssuominen@gentoo.org> + substract_wave-0.3.ebuild, +files/substract_wave-0.3-Makefile.patch, + -files/substract_wave-0.3.diff: + Fix Makefile to work with -Wl,--as-needed wrt #240484, thanks to Diego E. + Pettenò.