1998.07.09 16:30 "Re: tiffsplit in a cronjob", by Phillip Griffith
You may be relying on an environment variable to tell tiffsplit where to find the libtiff library. I know I do, for Solaris, with the LD_LIBRARY_PATH environment variable. Cron jobs may not get the same environment variables your login session does.
Bjorn Brox posted a solution back in May, that involves changing the makefile so that all the TIFF utilities know where to find libtiff without relying on environment variables.