Some recent update for Debian incorrectly assumed that everyone used stock kernels and thus had the feature enabled. In case you didn't, it would fail to launch the NFS server with this kind of error message
rpc.nfsd: unable to create inet6 TCP socket: errno 97 (Address family not supported by protocol)Novell suggests the following solution which actually happens to work. Another thing I had long forgotten appeared when compiling a new kernel. When mounting file systems as an ordinary user (the 'users' option set in /etc/fstab), the mount automatically gets the noexec flag set on. This more or less prevents one from compiling the kernel when it's located on this user mounted file system. Good to remember.