sci-libs/spooles-2.2: sed: -e expression #2, char 9: unknown option to `s'

[setun-90]

The command
sed -e "s/@CC@/$(tc-getCC)/" -e "s/@AR@/$(tc-getAR)/" -e "s/@RANLIB@/$(tc-getRANLIB)/" "${FILESDIR}"/Make.inc.in > Make.inc || die
fails with
sed: -e expression #2, char 9: unknown option to `s'

sci-libs_spooles-2.2_build.log
sci-libs_spooles-2.2_info.txt

The info also shows a userland_GNU USE flag which doesn't show up in equery uses spooles - I am puzzled as to how a USE flag deletion didn't trigger a rebuild earlier.