Please let me know if you need some more information / tests from me. This is starting to become critical on our side ; because although for GNU/Linux targets, it can be worked around by adding '-lcurl' to LDFLAGS (at the expense of making the resulting binary dependent on curl), there seem to be no workaround for mingw target (I get undefined references to Winsock functions, and adding '-lws2_32' doesn't help - maybe a calling convention problem?)