creating build/temp.linux-x86_64-2.7/pygraphviz
/opt/Modules/gcc/5.2.0/bin/gcc -fno-strict-aliasing -g -O2 -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -fPIC -I/opt/pkg/2015Q2/include/graphviz -I/shares/common/users/d.stetner/build/anac/include/python2.7 -c pygraphviz/graphviz_wrap.c -o build/temp.linux-x86_64-2.7/pygraphviz/graphviz_wrap.o
pygraphviz/graphviz_wrap.c:2954:29: fatal error: graphviz/cgraph.h: No such file or directory
 #include "graphviz/cgraph.h"
                             ^
compilation terminated.
error: command '/opt/Modules/gcc/5.2.0/bin/gcc' failed with exit status 1