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When building the arm-trusted-firmware, if the host environment has a value configured in the BL31 variable such as the following: export BL31=/tmp/bl31.elf This will cause the build of the bl31.elf to be skipped leading to the following build error: make[1]: Nothing to be done for 'bl31'. And then: readelf: Error: './output/build/arm-trusted-firmware-custom/build/versal/release/bl31/bl31.elf': No such file To fix this, clear the BL31 variable in the MAKE_OPTS, so that building the arm-trusted-firmware will build regardless of the host environment. Signed-off-by: Neal Frager <neal.frager@amd.com> Tested-by: Luca Ceresoli <luca.ceresoli@bootlin.com> Reviewed-by: Luca Ceresoli <luca.ceresoli@bootlin.com> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>