1make: Unknown modifier 'Z' 2make: "cond-token-string.mk" line 9: Malformed conditional ("" != "${:Uvalue:Z}") 3make: "cond-token-string.mk" line 18: xvalue is not defined. 4make: "cond-token-string.mk" line 24: Malformed conditional (x${:Uvalue} == "") 5make: "cond-token-string.mk" line 33: Expected. 6make: Fatal errors encountered -- cannot continue 7make: stopped in unit-tests 8exit status 1 9