Here's a stripped down demonstration:

$ /opt/apache/bin/httpd -D USER -D DEVELOPMENT $* -f ~/httpd.conf
Syntax error on line 64 of /home/yscottthoennes/httpd.conf:
One or more of the following files could not be located:\n   file1\n  
+ file2\nin the directory /home/yscottthoennes/www_cache.  You must ru
+n the build script for the missing files prior to Apache startup.\nCo
+mpilation failed in require at (eval 4) line 3.\n
$ grep Foo httpd.conf
PerlModule                    Foo
$ cat Foo.pm
package Foo;

use strict;
use warnings;

my $dir = '/home/yscottthoennes/www_cache';
my @reqd_files = qw/ file1 file2 /;

die "One or more of the following files could not be located:\n   " .
        join( "\n   ", @reqd_files ) . "\nin the directory $dir.  " .
        "You must run the build script for the missing files " .
        "prior to Apache startup.\n" if ( grep { ! -r "$dir/$_" } @req
+d_files );

1;
$
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