build_checks() {

	local __ _exit _pname;

	for __ in ${DEFAULT_CHECK_PATH_VARS}; do

		if [ -z "${___:=$(ex_rtl_get_var_unsafe "${__}")}" ]; then

			ex_rtl_log_msg failexit "Error: variable \`${__}' is empty or unset.";

		elif [ "${___#* *}" != "${___}" ]; then

			ex_rtl_log_msg failexit "Error: variable \`${__}' contains one or more whitespace characters.";

		fi;

	done;

	for __ in ${DEFAULT_CHECK_PREREQ_CMDS} $(eval echo ${DEFAULT_CHECK_PREREQ_FILES_DYNAMIC}) ${DEFAULT_CHECK_PREREQ_FILES}; do

		if [ "${__#/}" != "${__}" ]; then

			if [ ! -e "${__}" ]; then

				ex_rtl_log_msg fail "Error: missing prerequisite file \`${__}'.";

				_exit=1;

			fi;

		else

			if ! ex_rtl_test_cmd "${__}"; then

				ex_rtl_log_msg fail "Error: missing prerequisite command \`${__}'.";

				_exit=1;

			fi;

		fi;

	done;

	for __ in ${DEFAULT_CHECK_PREREQ_PERL_MODULES}; do

		if ! perl -M"${__}" -e "" 2>/dev/null; then

			ex_rtl_log_msg fail "Error: missing prerequisite Perl module \`${__}'.";

			_exit=1;

		fi;

	done;

	if [ ${_exit:-0} = 1 ]; then

		exit 1;

	fi;

	if [ ${ARG_CLEAN:-0} -eq 1 ]; then

		ex_rtl_log_msg info "-c specified, cleaning prefix...";

		for _pname in ${DEFAULT_CLEAR_PREFIX_PATHS}; do

			ex_rtl_fileop rm ${PREFIX}/${_pname};

		done;

	fi;

};

# vim:filetype=sh