If you try to build fakenes with LDFLAGS="-Wl,--as-needed" emerge process will fail when trying to install the binary which hasn't been produced because of a link failure.
See attached build log.
Created attachment 211591 [details]
After fixing reference to openal-config by Tupone Alfredo on Dec 04, package builds with as-needed on my box.
thanks for the report. Reopen if this is still a problem.