make: "directive-unexport.mk" line 14: UT_A=a UT_B=b UT_C=c
make: "directive-unexport.mk" line 15: UT_A UT_B UT_C
make: "directive-unexport.mk" line 23: UT_A=a UT_B=b UT_C=c
make: "directive-unexport.mk" line 24: 
make: "directive-unexport.mk" line 26: Unknown directive "unexpor"
make: Fatal errors encountered -- cannot continue
make: stopped in unit-tests
exit status 1