$ make CXXFLAGS="-I../secp256k1/install/usr/local/include -L../secp256k1/install/usr/local/lib -static" g++ -O2 -Wall -I../secp256k1/install/usr/local/include -L../secp256k1/install/usr/local/lib -static -I. contracthashtool.c stolen.cpp uint256.cpp crypto/ripemd160.cpp crypto/sha2.cpp -o contracthashtool -lsecp256k1 contracthashtool.c: In function ‘int main(int, char**)’: contracthashtool.c:246:75: error: cannot convert ‘unsigned char*’ to ‘secp256k1_pubkey_t*’ for argument ‘2’ to ‘int secp256k1_ec_pubkey_tweak_add(const secp256k1_context_t*, secp256k1_pubkey_t*, const unsigned char*)’ if (secp256k1_ec_pubkey_tweak_add(secp256k1_ctx, keys_work[i], 33, res) == 0) { ^ contracthashtool.c:290:67: error: cannot convert ‘unsigned char*’ to ‘secp256k1_pubkey_t*’ for argument ‘2’ to ‘int secp256k1_ec_pubkey_create(const secp256k1_context_t*, secp256k1_pubkey_t*, const unsigned char*)’ if (secp256k1_ec_pubkey_create(secp256k1_ctx, pub, &len, priv, 1) != 1 || len != 33) ^ make: *** [all] Error 1