Hi,
using gradm-2.1.7-200511041858 from
http://www.grsecurity.net/~spender/
I found a small (easy to fix) "grave" bug,
the make, then make install, do not copy the created grlearn into /sbin/
Afeter make and make install,
root@lore:/home/raf256/cre.os/grsec/gradm/gradm-2.1.7-200511041858/gradm2# gradm -E
/sbin/grlearn does not exist. Please reinstall gradm.
# file /sbin/grlearna
/sbin/grlearn: ERROR: cannot open `/sbin/grlearn' (No such file or directory)
so I just did cp grlearn /sbin/ and now it works