nmh-1.0.3-6x on RedHat Linux 6.1/i386 with all announced security/errata updates the command 'man nmh' results in (standard input):8: unsafe to execute request 'tmac.h' tmac.h is placed in /usr/man by nmh install nmh.1 uses ".so tmac.h" I manually included tmac.h into nmh.1 so the page would display; I'm not familiar enough with the man page system to provide the "correct" fix
What version of groff ("rpm -q groff")? I believe the problem is fixed in the groff-1.15-8 package from Raw Hide (or Red Hat 6.2). Please reopen if I'm wrong.