ports/177515: textproc/libxml2-2.7.8_0 causes other ports to fail compilation

[Walter Hurry]

>Number:         177515
>Category:       ports
>Synopsis:       textproc/libxml2-2.7.8_0 causes other ports to fail compilation
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-ports-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Sat Mar 30 23:30:00 UTC 2013
>Closed-Date:
>Last-Modified:
>Originator:     Walter Hurry
>Release:        9.1-RELEASE
>Organization:
>Environment:
FreeBSD red.laptop 9.1-RELEASE FreeBSD 9.1-RELEASE #0 r243825: Tue Dec  4 09:23:10 UTC 2012     root at farrell.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC  amd64
>Description:
After upgrading textproc/libxml2 from version 2.7.8_5 to version 2.7.8_0, a number of ports dependent on libxml2 will not compile.

One example is x11-toolkits/gtksourceview2. The following error is received:

  CCLD   test-widget
./gtksourceview/.libs/libgtksourceview-2.0.so: undefined reference to 
`xmlTextReaderRelaxNGValidate'
gmake[2]: *** [test-widget] Error 1

The only workaround I have found so far is to downgrade textproc/libxml2-2.7.8_0 to version 2.7.8_5 again (and downgrade /usr/ports/textproc/py-libxml2 to version 2-2.7.8_2 with it)
>How-To-Repeat:
Upgrade textproc/libxml2 from version 2.7.8_5 to version 2.7.8_0 (and textproc/py-libxml2 with it).

Try to recompile x11-toolkits/gtksourceview2 and other dependent ports
>Fix:


>Release-Note:
>Audit-Trail:
>Unformatted: