Created attachment 164432 [details] powerpc64-gcc-build_depends.diff Append to BUILD_DEPENDS variable instead of setting it. This allows slave ports define additional dependencies. Existing ports do not need this functionality but upcoming devel/mips-none-elf-gcc port requires it
Why not simply adding the new build dependency after including the master port makefile inside devel/mips-none-elf-gcc/Makefile like .include "${MASTERDIR}"/Makefile BUILD_DEPENDS+= newdep
portlint complains if there is anything after ".include" line. But it's, probably more portlint issue. Closing this one