Frank Maas says:

I have had this question a couple of times, so I wondered if you could
add the following comment just before the #include <sys/vnode.h> state-
ment in src/kernel/irix5.c... (we are talking pident2.5.1 here ;-):

/** Well... here some problems begin: when upgrading IRIX to 5.3 the **/
/** `inst' program shows one of its peculiar bugs: the file vnode.h  **/
/** has changed location in between versions and now the file is up- **/
/** grade first (new package) and then deleted (old package). So if  **/
/** you have problems finding this file: reinstall eoe1.sw.unix.     **/