shebang line, gives syntax error

["Ruud H.G. van Tol" <rvtol@isolution.nl>]

I have put a shebang-line
in the very first line of
a .gp file, like:

#!/usr/local/bin/gp

When I let that file run itself,
it mentions:

parisize = 8000000, primelimit = 500000, nbthreads = 8
  ***   syntax error, unexpected '/': #!/usr/local/bin/gp
  ***                                   ^-----------------
... skipping file '<redacted>.gp'

How to make gp ignore that shebang-line?

- - - - - - - - -

BTW, a (dirty) workaround is:

$ ln -fs $(which gp) ~/run_gp

and then use

#!run_gp

or even

#!run_gp -q

-- Greetings, Ruud