x11/xextproto breaks libXext build

[Scott Allendorf]

The recent upgrade to x11/xextproto 7.0.5 appears to break the building 
of x11/libXext (which was working until this update):

==========================================================================
scatest2# portupgrade libXext
--->  Upgrading 'libXext-1.0.3,1' to 'libXext-1.0.4,1' (x11/libXext)
--->  Building '/usr/ports/x11/libXext'
===>  Cleaning for libXext-1.0.4,1
===>  Extracting for libXext-1.0.4,1
=> MD5 Checksum OK for xorg/lib/libXext-1.0.4.tar.bz2.
=> SHA256 Checksum OK for xorg/lib/libXext-1.0.4.tar.bz2.
===>  Patching for libXext-1.0.4,1
===>   libXext-1.0.4,1 depends on file: 
/usr/local/libdata/pkgconfig/xextproto.pc - found
===>   libXext-1.0.4,1 depends on file: 
/usr/local/libdata/pkgconfig/xproto.pc - found
===>   libXext-1.0.4,1 depends on file: 
/usr/local/libdata/pkgconfig/x11.pc - found
===>   libXext-1.0.4,1 depends on file: 
/usr/local/libdata/pkgconfig/xau.pc - found
===>   libXext-1.0.4,1 depends on executable: pkg-config - found
===>  Configuring for libXext-1.0.4,1

...

  cc -DHAVE_CONFIG_H -I. -I.. -D_THREAD_SAFE -I/usr/local/include 
-DMALLOC_0_RETURNS_NULL -O2 -fno-strict-aliasing -pipe -march=pentium4 
-MT extutil.lo -MD -MP -MF .deps/extutil.Tpo -c extutil.c  -fPIC -DPIC 
-o .libs/extutil.o
extutil.c:254: error: conflicting types for 'XSetExtensionErrorHandler'
/usr/local/include/X11/extensions/Xext.h:43: error: previous declaration 
of 'XSetExtensionErrorHandler' was here
extutil.c:254: error: conflicting types for 'XSetExtensionErrorHandler'
/usr/local/include/X11/extensions/Xext.h:43: error: previous declaration 
of 'XSetExtensionErrorHandler' was here
extutil.c: In function `XMissingExtension':
extutil.c:272: warning: passing arg 2 of pointer to function discards 
qualifiers from pointer target type
*** Error code 1

Stop in /home/sca/usr/ports/x11/libXext/work/libXext-1.0.4/src.
*** Error code 1

Stop in /home/sca/usr/ports/x11/libXext/work/libXext-1.0.4.
*** Error code 1

Stop in /home/sca/usr/ports/x11/libXext/work/libXext-1.0.4.
*** Error code 1

Stop in /usr/ports/x11/libXext.
==========================================================================

Cheers,

Scott

-- 
Scott C. Allendorf                     Email:  scott-allendorf at uiowa.edu
UNIX Systems Administrator             Office:       216A Van Allen Hall
Department of Physics and Astronomy    Voice:             (319) 335-0003
The University of Iowa                 FAX:               (319) 335-1753
Iowa City, Iowa  52242-1479            ICBM:  41 39 43.6 N  91 31 55.1 W
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