Problem with cflow

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I am having problems with cflow.  I am using ULTRIX 4.0 on a DECstation
5000/200.  After modifying the cflow script so it could actually find
lint1, when I run cflow in the little example in the man pages for cflow
it works OK.  When I run it for a real program i get 

/usr/bin/cflow: 11987 Memory fault - core dumped

I ran cflow on a SUN on the same files with no problems.  What gives?