Fix the locale before running tests in order to make sure that sort

behaves in the same manner on all configurations.

src/test/Makefile

@@ -5,13 +5,13 @@ LC2=../lus2lic --compile-all-items
 NL="----------------------------------------------------------------------\\n"
 filter_line=grep -v Opening\ file
 
-OK_LUS=$(shell find should_work -name "*.lus" -print | sort -n)
+OK_LUS=$(shell find should_work -name "*.lus" -print | LC_ALL=C sort -n)
 
-KO_LUS=$(shell find should_fail -name "*.lus" -print | sort -n)
+KO_LUS=$(shell find should_fail -name "*.lus" -print | LC_ALL=C sort -n)
 
 ALL_LUS=$(OK_LUS) $(KO_LUS)
 
-LIC=$(shell find should_work -name "*.lic" -print | sort -n)
+LIC=$(shell find should_work -name "*.lic" -print | LC_ALL=C sort -n)
 
 
 when: