With rtnet-0.9.12, RTAI and new version of kernels (e.g. 18.104.22.168) the command:
returns this error:
line 11568: .: .rtnet_config: file not found
To correct this problem the configure file must be corrected or configuration must be performed directly with a shell command.
In the second hypothesis, for instance, if RTAI patched kernel is in the directory /usr/src/linux and RTAI is installed in the directory /usr/rtai and a Realtek Semiconductor 8139 network card is used an example of configuration command is:
./configure --enable-8139 --with-linux=/usr/src/linux --with-rtext=/usr/rtai/