downloading https://github.com/eile/tclap/archive/tclap-1-2-1-release-final.tar.gz GET returned 404 Not Found

this file url is no longer valid，today
In addition, how to use the build option --distdir?
I tried
build --distdir=/source/pkg,
and the local file path is
/source/pkg/com_github_eile_tclap/tclap-1-2-1-release-final.tar.gz
or
/source/pkg/tclap-1-2-1-release-final.tar.gz

But it is not succeed.