Without the change parallel build fails as:
cowpatty> clang -pipe -Wall -DOPENSSL -O2 -g3 -ggdb genpmk.c -o genpmk utils.o sha1.o -lpcap -lcrypto
cowpatty> clang-11clang-11: : errorerror: no such file or directory: 'utils.o'
cowpatty> : no such file or directory: 'utils.o'