See attached build log. (Please do not complain about the need for looking at the build log until you can provide an easy way to open bugs with the correct data picked out of a tinderbox log. Thanks.)
Created attachment 245436 [details] Build log
Adding LDFLAGS="${LDFLAGS}" on the emake line in src_compile solve this issue for me. No need to patch the Makefile.
[QA] Fixed.