SSI exec cmd

Dear folks,

I would appreciate any pointers on how to get this line to work in my HTML files on my Dreamhost web space:

I know that SSI is working in principle, because this line works:

“boinxcurl” is a shell script that I can execute from the shell. However, I do not get any error message or anything telling me what might be wrong. My guess is that it is not in the search path, but I can also not execute it when I give the explicit path to the executable.

Any ideas?