Cannot build with pthreads

Hi,
I'm working on a DAP project via mingwW64 and ran into an issue with it trying to link against `-lpthreads` (I think my MinGW install does not provide it).
Is this dependency required? I was able to to build fine by stripping this bit: https://git.allpurposem.at/mat/cppdap/commit/a31323c2eeb2fa4253e3f441776a3fec53024116 though I have not further tested use of this library.