Unable to build www/mediawiki

[Peter Jeremy]

When I try to build www/mediawiki with built-in TeX rendering (WITH_TEXVC)
on, I get:

server% make
===>  License check disabled, port has not defined LICENSE
===>  Found saved configuration for mediawiki-1.18.0
===>  Extracting for mediawiki-1.18.0
=> SHA256 Checksum OK for mediawiki-1.18.0.tar.gz.
===>  Patching for mediawiki-1.18.0
===>   mediawiki-1.18.0 depends on executable: ocaml - found
===>   mediawiki-1.18.0 depends on executable: gmake - found
===>   mediawiki-1.18.0 depends on shared library: mysqlclient.16 - found
===>  Configuring for mediawiki-1.18.0
===>  Building for mediawiki-1.18.0
cd: can't cd to /tank/obj/usr/ports/www/mediawiki/work/mediawiki-1.18.0/math
*** Error code 2

Stop in /usr/ports/www/mediawiki.
*** Error code 1

Stop in /usr/ports/www/mediawiki.
server% 

The cd fails because that directory doesn't exist (though the parent does).
This appears to be caused by:
# $FreeBSD: ports/www/mediawiki/Makefile,v 1.72 2011/12/08 01:56:00 wen Exp $
...
do-build:
.if defined(WITH_TEXVC)
        @(cd ${WRKSRC}/math && ${GMAKE})
.endif

Could you please look into this.

-- 
Peter Jeremy
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