Hi, i have the same problem with L4T 32.4.2.
I also have a solution. This is caused by new version of make 4.3.
Problem is described here: makefile - Possible bug in GNU make 4.3? - Stack Overflow
To make it working you must edit file: scripts/Kbuild.include
Then change lines:
the-space :=
the-space +=
To:
E =
the-space = $E $E