U-Boot must use $(BR2_MAKE) as it uses a Make feature from v4.0. We already use $(BR2_MAKE) in the BUILD_CMDS, but the kconfig commands still uses $(MAKE). Without this fix, building U-Boot with kconfig will fail with the following cryptic error. > Makefile:37: *** missing separator. Stop. Signed-off-by: Brandon Maier <brandon.maier@rockwellcollins.com> Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr> (cherry picked from commit 43dc2007a93194f6126987a2f2716dda1f3f17b5) Signed-off-by: Peter Korsgaard <peter@korsgaard.com>