Quick answer.

That's a C problem, that is, it is make reporting the failure of a C compiler component (the linker, prob. gcc ld) and that's a failure of the build to be set up properly (in other words, configured)

If we take a look at the linker command being echoed by make, we see cc -L/usr/local/lib -o miniperl [...] miniperlmain.o opmini.o

No -lpthreads in there.

Something has gone amiss with your configury of the build.