+defvalopt '--build-products-dir','','.*', \$buildproductsdir;
+
+defvalopt '--initiator-tempdir','','.*', sub {
+ ($initiator_tempdir) = (@_);
+ $initiator_tempdir =~ m#^/# or
+ badusage "--initiator-tempdir must be used specify an".
+ " absolute, not relative, directory."
+};