Fresh install of 1.26, the logo doesn't work... Docroot set as /var/www in apache config, mw in w folder, accessed and installed from this dir

GET http://10.0.100.174/resources/assets/wiki.png 404 (Not Found)

In LocalSettings.php we see

$wgScriptPath = "/w";

## The protocol and server name to use in fully-qualified URLs
$wgServer = "http://10.0.100.174";

#var_dump( $wgResourceBasePath ); die();
## The relative URL path to the logo.  Make sure you change this from the default,
## or else you'll overwrite your logo when you upgrade!
$wgLogo = "$wgResourceBasePath/resources/assets/wiki.png";

$wgResourceBasePath is null at this point, not set in LocalSettings.php. Should the substitution wait till later? (ie not use "", and then str_replace? Or should the installer be settings $wgResourceBasePath?). Not using a w subdir under the docroot would mean that it would work by fluke, rather than design