I configured the build to enable memkind:

cmake -DENABLE_MEMKIND=1 ../.

The ccmake showed that ENABLE_MEMKIND=1, but when I built the library and ran it, the code paths that were delimited by:

#ifdef ENABLE_MEMKIND
...
#endif

did not execute. To fix that, I manually added -DENABLE_MEMKIND to CMakeFiles/wiredtiger_shared.dir/flags.make.

After that, the build correctly enabled the flags.

We need to fix that, so that using cmake -DENABLE_MEMKIND=1 automatically produces the -DENABLE_MEMKIND flag.