expect_configuration always
common_setup
make configure bindir='${prefix}/special'
make clean
expected='bindir = ${prefix}/special'
conf=$(make show_configuration --no-print-directory)
if [ "${conf}" != "${expected}" ] ; then
   echo "Expected configuration:" >&2
   echo "${expected}" >&2
   echo "Configuration found:" >&2
   echo "${conf}" >&2
   exit 1
fi