diff -up extra-cmake-modules-5.91.0/tests/ECMPoQmToolsTest/check.cmake.in.orig extra-cmake-modules-5.91.0/tests/ECMPoQmToolsTest/check.cmake.in
--- extra-cmake-modules-5.91.0/tests/ECMPoQmToolsTest/check.cmake.in.orig	2022-02-05 16:33:17.000000000 +0100
+++ extra-cmake-modules-5.91.0/tests/ECMPoQmToolsTest/check.cmake.in	2022-02-14 16:48:05.753931574 +0100
@@ -74,7 +74,7 @@ if("@CMAKE_SYSTEM_NAME@" STREQUAL "Linux
         foreach(lang en de de_AT fr)
             execute_process(
                 COMMAND "${CMAKE_COMMAND}" -E env "XDG_DATA_DIRS=${ACTUAL_TREE}/share"
-                    LANG=${lang} "${exec}"
+                    LC_ALL=${lang} "${exec}"
                 OUTPUT_VARIABLE output
             )
             string(STRIP "${output}" stripped_output)