Check the attached build log, grep for -Wno-pointer-sign.
Created attachment 162298 [details]
Created attachment 181059 [details, diff]
configure.ac had a trivial error with CXXFLAGS="$(CFLAGS) ". I run a basic sed in configure (not configure.ac to prevent autoconf) and it fixes everything.
This patch is adding the sed command and switch from src_unpack to src_prepare.
I assumed it will be better to update to -r1 so everyone will recompile the ebuild with fixed CXXFLAGS.