Suggestion: Which Binary?

Dear PostgreSQL Hackers,

I recently ran into an issue where I was having trouble compiling  
PostgreSQL with PL/Perl. Although Mac OS X 10.4 comes with a dynamic  
Perl, I long ago compiled my own Perl, which is static. So /usr/bin/ 
perl was my static Perl, and /usr/bin/perl5.8.6 is the stock Perl.  
But of course, PostgreSQL's configure script was just executing  
'perl' and finding it in the path, thus getting my static Perl which,  
of course, wouldn't work.

I got 'round this by temporarily moving things around:
  rm /usr/bin/perl  ln /usr/bin/perl5.8.6 /usr/bin/perl  ./configure --with-perl  rm /usr/bin/perlo  ln
/usr/local/bin/perl5.8.8/usr/bin/perl
 

But that's a PITA. I'd much rather have been able to tell configure  
*which* perl to use:
  ./configure --with-perl=/usr/bin/perl5.8.6

Would it be possible to add support for an optional argument to the  
PL/* options (--with-perl,--with-python, --with-tcl) so that we can  
get it to use the correct binary without having to resort to any  
shenanigans?

Just an idea.

Thanks!

David