https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120106
--- Comment #13 from Eric Botcazou <ebotcazou at gcc dot gnu.org> --- > The default GNATMAKE_FOR_BUILD in the ada Makefiles should be set with '?=' > instead of '=', so that the value passed by the top level Makefile or the > user via the environment is not overridden. That's already how "=" works though, see 9.5 Overriding Variables in the GNU make manual.
