Compiling a program with with a rpc call, the following error:
Code:
g++ -g -I/usr/include/ntirpc -c vxi11_cmd.cc -o vxi11_cmd.o 
In file included from /usr/include/ntirpc/rpc/rpc.h:47, 
                 from vxi11_user.h:31, 
                 from vxi11_cmd.cc:25:

/usr/include/ntirpc/rpc/xdr.h:136:18:error: declaration of ‘vio_type xdr_vio::vio_type’ changes meaning of ‘vio_type’ [-fpermissive] 
  136 |         vio_type vio_type;      /* type of buffer */
This error is thrown in a system file. Nothing included before (#include <rpc/rpc.h).

Anybody knows, how to solve this problem?

Original Program:
https://github.com/applied-optics/vxi11

Thanks,
Johannes