Help: unknown issue (config) breaking xorg port

[Andrew Johnson]

Hi,
  Trying to build xorg on a workstation that hadn't been updated
since 25 Feb 2014.

  Any suggestion or advice on why the build may not be not looking in
the right directory would be much appreciated.
  Rebuilt system:   10.1-PRERELEASE GENERIC i386  Nov 16 2014
  All ports deleted.
  Old /var/db/ports and etc directories left in place.

  I did a make install clean in ports-mgmt/portupgrade 
  and then did the same in x11/org
  The build has installed libraries including
/usr/local/include/X11/Xlib.h
  The xorg build then gets up to this death throw:

===>   xorg-apps-7.7_1 depends on executable: dga - not found
===>    Verifying install for dga in /usr/ports/x11/xf86dga
===>  Building for xf86dga-1.0.3_1
--- all ---
/usr/bin/make  all-am
--- dga.o ---
  CC     dga.o
dga.c:3:10:  fatal error: 'X11/Xlib.h' file not found
#include <X11/Xlib.h>
         ^
1 error generated.
*** [dga.o] Error code 1

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