Drush Make: Do this instead of x.x-dev

; Download the module with Git
projects[webform_userpoints][download][type] = "git"

; Find this revision by clicking View Commits on the project page
; in the lower right-hand column. Click on the most recent commit
; in the branch you were going to use. Copy and paste the full revision
; identifier.
projects[webform_userpoints][download][revision] = "25bfe11d2c6dc6480d0aabc79b1edb54dec06236"

; Tell Drush Make it's a module. This might not be necessary.
projects[webform_userpoints][type] = "module"

; You can erase or change the subdirectory. I like to separate
; my Git-downloaded modules.
projects[webform_userpoints][subdir] = "_custom"