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+package blib;
+
+=head1 NAME
+
+blib - Use MakeMaker's uninstalled version of a package
+
+=head1 SYNOPSIS
+
+ perl -Mblib script [args...]
+
+ perl -Mblib=dir script [args...]
+
+=head1 DESCRIPTION
+
+Looks for MakeMaker-like I<'blib'> directory structure starting in
+I<dir> (or current directory) and working back up to five levels of '..'.
+
+Intended for use on command line with B<-M> option as a way of testing
+arbitrary scripts against an uninstalled version of a package.
+
+However it is possible to :
+
+ use blib;
+ or
+ use blib '..';
+
+etc. if you really must.
+
+=head1 BUGS
+
+Pollutes global name space for development only task.
+
+=head1 AUTHOR
+
+Nick Ing-Simmons nik@tiuk.ti.com
+
+=cut
+
+use Cwd;
+use File::Spec;
+
+use vars qw($VERSION $Verbose);
+$VERSION = '1.04';
+$Verbose = 0;
+
+sub import
+{
+ my $package = shift;
+ my $dir;
+ if ($^O eq "MSWin32" && -f "Win32.xs") {
+ # We don't use getcwd() on Windows because it will internally
+ # call Win32::GetCwd(), which will get the Win32 module loaded.
+ # That means that it would not be possible to run `make test`
+ # for the Win32 module because blib.pm would always load the
+ # installed version before @INC gets updated with the blib path.
+ chomp($dir = `cd`);
+ }
+ else {
+ $dir = getcwd;
+ }
+ if ($^O eq 'VMS') { ($dir = VMS::Filespec::unixify($dir)) =~ s-/\z--; }
+ if (@_)
+ {
+ $dir = shift;
+ $dir =~ s/blib\z//;
+ $dir =~ s,/+\z,,;
+ $dir = File::Spec->curdir unless ($dir);
+ die "$dir is not a directory\n" unless (-d $dir);
+ }
+ my $i = 5;
+ my($blib, $blib_lib, $blib_arch);
+ while ($i--)
+ {
+ $blib = File::Spec->catdir($dir, "blib");
+ $blib_lib = File::Spec->catdir($blib, "lib");
+
+ if ($^O eq 'MacOS')
+ {
+ $blib_arch = File::Spec->catdir($blib_lib, $MacPerl::Architecture);
+ }
+ else
+ {
+ $blib_arch = File::Spec->catdir($blib, "arch");
+ }
+
+ if (-d $blib && -d $blib_arch && -d $blib_lib)
+ {
+ unshift(@INC,$blib_arch,$blib_lib);
+ warn "Using $blib\n" if $Verbose;
+ return;
+ }
+ $dir = File::Spec->catdir($dir, File::Spec->updir);
+ }
+ die "Cannot find blib even in $dir\n";
+}
+
+1;