Hi everyone, This patch series was born after I noticed that libssh_threads.so was not being built on FreeBSD in our ports tree: we pass -DTHREADS_HAVE_PTHREAD_ARG=1 by default to CMake there. It means all the checks for -lpthread, -lpthreads, -lthread etc are skipped and CMake knows that pthreads is present and -pthread is supposed to be passed to the compiler.
A side-effect of this is that CMAKE_HAVE_THREADS_LIBRARY is not set (as far as I understood, it is supposed to mean that a separate threading library like libthread.so or libpthreads.so is present on the system). This can be "fixed" in the build system by checking for the availability of pthreads in the system in question, since that's ultimately what is needed and used.
