Getting the config on root dir and solving a build bug.

Makefile.PL

@@ -1,4 +1,8 @@
 use ExtUtils::MakeMaker;
+use File::Basename;
+use Const::Fast;
+
+const my $CONFIG_FILE => dirname(__FILE__) . '/peertube-dl-web.conf';
 
 WriteMakefile(
     NAME        => 'Peertube::DL',
@@ -10,12 +14,39 @@ WriteMakefile(
     DIR         => [ 'src', 'javascript_interpreter_xs/' ],
 );
 
-sub MY::postamble {
-    '
-src: src/Makefile
-	src && $(MAKE) $(PASSTHRU)
-javascript_interpreter_xs: javascript_interpreter_xs/Makefile
-	cd javascript_interpreter_xs/ && $(MAKE) $(PASSTHRU)
-';
-}
+package MY {
 
+    sub top_targets {
+        my $self   = shift;
+        my $return = $self->SUPER::top_targets(@_);
+        $return = [ split /\n/, $return ];
+        for my $i ( keys @$return ) {
+            $return->[$i] .= ' install_config' if $return->[$i] =~ /^all :/;
+        }
+        return join "\n", @$return;
+    }
+
+    sub const_config {
+        my $self   = shift;
+        my $return = $self->SUPER::const_config(@_);
+
+        open my $fh, '<', $CONFIG_FILE or die "No config file";
+        my $config = eval( join ' ', <$fh> );
+        close $fh;
+
+        chomp $return;
+        return $return . '
+THEME = ' . ( $config->{theme} // 'default' ) . "\n";
+    }
+
+    sub postamble {
+        return
+            "\n"
+          . "install_config :\n"
+          . "\tinstall peertube-dl-web.conf bin/peertube-dl-web.conf\n"
+          . "src: src/Makefile\n"
+          . "\tcd src && $(MAKE) $(PASSTHRU)\n"
+          . "javascript_interpreter_xs: javascript_interpreter_xs/Makefile\n"
+          . "\tcd javascript_interpreter_xs/ && $(MAKE) $(PASSTHRU)\n";
+    }
+}

javascript_interpreter_xs/javascript.xs

@@ -92,7 +92,7 @@ _duk_call_function(SV *, SV *, ...)
         }
         duk_size_t *lstring_len;
         duk_call(context, 1);
-        char * return_value = duk_get_lstring(context, -1, lstring_len);
+        const char * return_value = duk_get_lstring(context, -1, lstring_len);
         if ( (top_index = duk_get_top_index(context)) != DUK_INVALID_INDEX ) {
             duk_pop_n(context, top_index+1);
         }