I've been using SVN::Notify to find executables. Try this:

 
#!/usr/bin/perl

use strict;
use warnings;
use ExtUtils::MakeMaker qw(prompt);
use File::Spec;
use SVN::Notify;

my $exe_name = prompt("Enter name of exe: ");
my $exe = SVN::Notify->find_exe($exe_name);
print "$exe\n";
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