Fails to Compile on FreeBSD

[cieplak]

c_src/exec.cpp:474:14: error: #error setresuid(3) not supported!
             #error setresuid(3) not supported!
              ^

c_src/exec_impl.cpp:352:58: error: ptsname_r was not declared in this scope
             r = ptsname_r(fdm, pts_name, sizeof(pts_name));
                                                          ^