I tried building it but it looks like you are missing a dependency.
make[1]: Entering directory '/build/vim-command-t-1.13'
cd ruby/command-t && ruby extconf.rb
mkmf.rb can't find header files for ruby at /usr/lib/ruby/include/ruby.h
debian/rules:7: recipe for target 'override_dh_auto_configure' failed
make[1]: *** [override_dh_auto_configure] Error 1
make[1]: Leaving directory '/build/vim-command-t-1.13'
debian/rules:4: recipe for target 'build' failed
make: *** [build] Error 2
dpkg-buildpackage: error: debian/rules build gave error exit status 2