This patch deals with the 401 Unauthorized message in the RTSP negotiation, this message is not part of the RTSP standard, but several IP cameras and RTSP servers need authentication to work properly.
 
In order to execute this patch you have to follow the following steps:
1. Copy curl.patch into the $HOME_CURL
2. Execute in the terminal: patch -p1 -i curl.patch
3. Then make && make install