+ unless sh "top_srcdir=$(pwd)/@top_srcdir@; top_builddir=$(pwd)/@top_builddir@; export ARCHFLAGS=\"-arch $(uname -m)\"; cd #{File::dirname(EXT_CONF)}; ruby #{File::basename(EXT_CONF)} --with-_guestfs-include=$top_srcdir/src --with-_guestfs-lib=$top_builddir/src/.libs"