Apparently, the makefile of dvd+rw-tools-7.1 uses several bashisms, e.g. when /bin/sh is a symlink to dash there are errors like [: 1: ==: unexpected operator I suggest to either patch the makefile or (simpler) to pass SHELL=/bin/bash to the call of make from within the ebuild
+ 28 Sep 2008; Peter Alfredsen <loki_val@gentoo.org> + dvd+rw-tools-7.1.ebuild: + Fixed dash compat. Bug 233408. +