Thanks-to: James Browning
Gentoo bug: 836730
Gentoo bug: 967742

--- a/SConscript
+++ b/SConscript
@@ -1542,7 +1542,6 @@ if not cleaning and not helping:
         have_canplayer = config.CheckProg('canplayer')
         have_coverage = config.CheckProg('coverage')
         have_cppcheck = config.CheckProg('cppcheck')
-        have_dia = config.CheckProg('dia')
         have_flake8 = config.CheckProg('flake8')
         have_pycodestyle = config.CheckProg('pycodestyle')
         have_pylint = config.CheckProg('pylint')