```
'/var/folders/fy/x2xtwh1n7fn0_0q2kk29xkv9vvmbqb/T/s3j/spack-stage/spack-stage-valgrind-3.15.0-mtir7ubjz7mqmjbb7bogze2qm35hl4ze/spack-src/configure' '--prefix=/ornldev/code/spack/opt/spack/clang-11.0.0-apple/valgrind/mtir7ub' '--enable-only64bit' '--build=amd64-darwin'
1 error found in build log:
43 checking host system type... x86_64-pc-darwin
44 checking for a supported CPU... ok (x86_64)
45 checking for a 64-bit only build... yes
46 checking for a 32-bit only build... no
47 checking for a supported OS... ok (darwin)
48 checking for the kernel version... unsupported (18.7.0)
>> 49 configure: error: Valgrind works on Darwin 10.x, 11.x, 12.x, 13.x, 14.x, 15.x, 16.x and 17.x (Mac OS X 10.6/7/8/9/10/11 and macOS 10.12/13)
```
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