graphics/graphviz does not install

[Rainer Hurling]

When I try to install graphics/graphviz from ports I get this error on
recent 10.0-CURRENT (amd64; clang):

gmake[4]: Entering directory
`/usr/ports/graphics/graphviz/work/graphviz-2.30.0/cmd/dot'
 /usr/local/bin/gmkdir -p '/usr/local/bin'
  /bin/sh /usr/local/bin/libtool   --mode=install install  -s -o root -g
wheel -m 555 dot dot_builtins '/usr/local/bin'
libtool: install: install -o root -g wheel -m 555 -s .libs/dot
/usr/local/bin/dot
libtool: install: install -o root -g wheel -m 555 -s .libs/dot_builtins
/usr/local/bin/dot_builtins
gmake  install-exec-hook
gmake[5]: Entering directory
`/usr/ports/graphics/graphviz/work/graphviz-2.30.0/cmd/dot'
(cd /usr/local/bin; if test -x dot; then for i in neato twopi fdp circo
osage patchwork sfdp; do rm -f $i; ln -s dot $i; done; fi;)
if test "x" = "x"; then if test -x /usr/local/bin/dot; then if test -x
/sbin/ldconfig; then /sbin/ldconfig 2>/dev/null; fi; /usr/local/bin/dot
-c; else /usr/local/bin/dot_static -c; fi; fi
Unable to find pthread_mutexattr_setkind_np versioned symbol. Aborting.
gmake[5]: *** [install-exec-hook] Abort trap (Speicherauszug erstellt)
gmake[5]: Leaving directory
`/usr/ports/graphics/graphviz/work/graphviz-2.30.0/cmd/dot'
gmake[4]: *** [install-exec-am] Fehler 2
gmake[4]: Leaving directory
`/usr/ports/graphics/graphviz/work/graphviz-2.30.0/cmd/dot'
gmake[3]: *** [install-am] Fehler 2
gmake[3]: Leaving directory
`/usr/ports/graphics/graphviz/work/graphviz-2.30.0/cmd/dot'
gmake[2]: *** [install-recursive] Fehler 1
gmake[2]: Leaving directory
`/usr/ports/graphics/graphviz/work/graphviz-2.30.0/cmd'
gmake[1]: *** [install-recursive] Fehler 1
gmake[1]: Leaving directory
`/usr/ports/graphics/graphviz/work/graphviz-2.30.0'
gmake: *** [install] Fehler 2


It differs from http://forums.freebsd.org/showthread.php?t=36708
(pthread_mutexattr instead of pthread_create), so option PTH in
lang/python27 does not help.

Is this a known issue? Please let me know, if I should provide more details.

Thanks in advance,
Rainer Hurling