Then I have a question about compiler warnings. Compiling gdl with our
gcc flags gives a lot of warnings about unused parameters (they are
unused params in callback functions, so the warnings don't really
apply here). Is there an easy way to suppress them just for this
directory using the current build system? There's a trick mentioned in
configure.ac:684 that suggest that removing the parameter name would
fix this, but I'm getting an "error: parameter name omitted" when
trying it? Is it perhaps valid C++, but invalid C?