To put a package on hold mode:
$ xbps-pkgdb -m hold foo
To unhold the package:
$ xbps-pkgdb -m unhold foo
To list packages on hold mode:
$ xbps-query -H
This also close#12 from github.
The list of required external deps is now confuse, libarchive and openssl.
libxbps now includes a wrapper for proplib prefixed with xbps_ rather than prop_.