Thanks for your help. Could this mean I am missing a dependency? Or have an OpenSSL build without EC support? Not sure where to go from here. I do not get the "ECDSA is disabled" message that the #error directive would apparently show if I didn't have ECDSA support.
Are you saying you do not have /usr/include/openssl/ec.h or /usr/include/openssl/ecdsa.h ?