as seen in https://github.com/xianyi/OpenBLAS/issues/1912#issuecomment-
514183900 , any external setting of TARGET_ARCH (which could result from building OpenBLAS as part of a larger project that actually uses this variable) would cause the utest build to fail.
(Other subtargets appear to be unaffected as they do not use implicit make rules)
UTEST_CHECK = 1
TOPDIR = ..
+override TARGET_ARCH=
+override TARGET_MACH=
+
UTESTBIN=openblas_utest
.PHONY : all