TSHttpTxnServerReqHdrBytesGet in ./proxy/InkAPI.cc has an extra parameter (int *bytes) from the prototype in ./proxy/api/ts/ts.h. The extra parameter needs to be removed as it is not used.

The definitions are:

./proxy/InkAPI.cc:TSHttpTxnServerReqHdrBytesGet(TSHttpTxn txnp, int *bytes)
./proxy/api/ts/ts.h.in: tsapi int TSHttpTxnServerReqHdrBytesGet(TSHttpTxn txnp);

The "int * bytes" parameter is not used and means that the function does not resolve and so cannot be used.