fix this test so it can be run outside of "dzil build"

t/file.t

@@ -2,6 +2,7 @@ use strict;
 use warnings;
 use Test::More;
 use Test::DZil;
+use File::pushd 'pushd';
 use Test::Script 1.05;
 
 my $tzil
@@ -14,6 +15,7 @@ my $tzil
 				'source/lib/Foo.pm' => "package Foo;\n1;\n",
 				'source/dist.ini' => simple_ini(
 					[ GatherDir => ],
+					[ MakeMaker => ],
 					['Test::PodSpelling']
 				)
 			}
@@ -33,6 +35,11 @@ my $fn
 
 ok ( -e $fn, 'test file exists');
 
-script_compiles( '' . $fn->relative, 'check test compiles' );
+{
+	my $wd = pushd $tzil->tempdir->subdir('build');
+	$tzil->plugin_named('MakeMaker')->build;
+
+	script_compiles( '' . $fn->relative, 'check test compiles' );
+}
 
 done_testing;