qt-pro-mode 
GNU Emacs major-mode for Qt build-system files
Install
From MELPA
(use-package qt-pro-mode
:ensure t
:mode ("\\.pro\\'" "\\.pri\\'"))Or manually, after downloading into your load-path
(require 'qt-pro-mode)
(add-to-list 'auto-mode-alist '("\\.pr[io]$" . qt-pro-mode))Acknowledgments
Thanks to Todd Neal for the original version of this file, which I found here.
License
GPL 2 (or higher) © Free Software Foundation, Inc.