graphviz-2.28.0 build error

[Leslie Jensen]

I'm having a problem with graphviz-2.28.0

I first tried portmaster -a

then cd /usr/ports/graphics/graphviz

make deinstall

make clean

make install clean

and I get the error below

Suggestions?

Thanks

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Making all in dot
gmake[3]: Går till katalogen 
"/usr/ports/graphics/graphviz/work/graphviz-2.28.0/cmd/dot"
   CC     dot-dot.o
   CC     dot-no_builtins.o
   CCLD   dot
../../lib/gvc/.libs/libgvc.so: undefined reference to `log2'
gmake[3]: *** [dot] Fel 1
gmake[3]: Lämnar katalogen 
"/usr/ports/graphics/graphviz/work/graphviz-2.28.0/cmd/dot"
gmake[2]: *** [all-recursive] Fel 1
gmake[2]: Lämnar katalogen 
"/usr/ports/graphics/graphviz/work/graphviz-2.28.0/cmd"
gmake[1]: *** [all-recursive] Fel 1
gmake[1]: Lämnar katalogen 
"/usr/ports/graphics/graphviz/work/graphviz-2.28.0"
gmake: *** [all] Fel 2
*** Error code 1

Stop in /usr/ports/graphics/graphviz.
*** Error code 1

Stop in /usr/ports/graphics/graphviz.

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