Just quick look into the final failure (all passed, but last stage - IFD failed):
Compile IFDTOOL
HOSTCC util/ifdfake/ifdfake
DD Adding Intel Firmware Descriptor
IFDTOOL Unlocking Management Engine
File build/coreboot.pre is 8388608 bytes
No Flash Descriptor found in this image
src/southbridge/intel/common/firmware/Makefile.inc:50: recipe for target 'add_intel_firmware' failed
make: *** [add_intel_firmware] Error 1
[user@localhost coreboot]$
At first, I suspect that culprit my .config file, but I have checked it several times (maybe > dozen), and I could NOT find any problem with it (except minor doubts).
Then I switched to inspect -southbridge- setup, but these is none, since (simplified explanation/view) APL-I is SoC.
The next phase was to inspect src/southbridge/intel/common/firmware/Makefile.inc , but there (although my make scripting is rusty) I could NOT find any problem...
Finally, somewhere around 2:00 AM I noticed/determined the root cause of the problem: the util/ifdtool/ifdtool.c, line: