There are alternate implementations of those libraries that use pthreads.
check_header windows.h
check_header X11/extensions/XvMClib.h
-disabled zlib || check_lib zlib.h zlibVersion -lz || disable zlib
-disabled bzlib || check_lib2 bzlib.h BZ2_bzlibVersion -lbz2 || disable bzlib
-
if ! disabled w32threads && ! enabled pthreads; then
check_func_headers "windows.h process.h" _beginthreadex && enable w32threads
fi
fi
done
+disabled zlib || check_lib zlib.h zlibVersion -lz || disable zlib
+disabled bzlib || check_lib2 bzlib.h BZ2_bzlibVersion -lbz2 || disable bzlib
+
enabled sync_val_compare_and_swap && enable atomics_gcc
enabled_all atomic_cas_ptr machine_rw_barrier && enable atomics_suncc
enabled MemoryBarrier && enable atomics_win32