I am trying to install pyGraphviz .. but no hope

[soma AA]

I have mac 10.7 and I installed py2.7 

I tried many times to run pyGraphviz.py by terminal but I got this error 

sh: dotneato-config: command not found

Warning: dotneato-config not in path.

   If you are using a non-unix system, 

   you will probably need to manually change

   the include_dirs and library_dirs in setup.py

   to point to the correct locations of your graphviz installation.

running install

running build

running build_py

running build_ext

gcc-4.2 not found, using clang instead

building 'pygraphviz._graphviz' extension

clang -fno-strict-aliasing -fno-common -dynamic -arch i386 -arch x86_64 -g -O2 -DNDEBUG -g -O3 -I/usr/include/graphviz -I/Library/Frameworks/Python.framework/Versions/2.7/include/python2.7 -c pygraphviz/graphviz_wrap.c -o build/temp.macosx-10.6-intel-2.7/pygraphviz/graphviz_wrap.o

pygraphviz/graphviz_wrap.c:847:38: warning: format string is not a string

      literal (potentially insecure) [-Wformat-security]

    PyErr_Format(PyExc_RuntimeError, mesg);

                                     ^~~~

pygraphviz/graphviz_wrap.c:2034:11: warning: initializing 'char *' with an

      expression of type 'const char *' discards qualifiers

      [-Wincompatible-pointer-types]

    char *doc = (((PyCFunctionObject *)obj) -> m_ml -> ml_doc);

          ^     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

pygraphviz/graphviz_wrap.c:2501:42: warning: incompatible pointer types passing

      'int *' to parameter of type 'Py_ssize_t *' (aka 'long *')

      [-Wincompatible-pointer-types]

    PyString_AsStringAndSize(obj, &cstr, &len);

                                         ^~~~

/Library/Frameworks/Python.framework/Versions/2.7/include/python2.7/stringobject.h:175:26: note: 

      passing argument to parameter 'len' here

    register Py_ssize_t *len    /* pointer to length variable or NULL

                         ^

pygraphviz/graphviz_wrap.c:2732:20: error: unknown type name 'Agsym_t'

  char *agattrname(Agsym_t *atsym) {    

                   ^

pygraphviz/graphviz_wrap.c:2737:22: error: unknown type name 'Agsym_t'

  char *agattrdefval(Agsym_t *atsym) {

                     ^

pygraphviz/graphviz_wrap.c:2747:3: error: use of undeclared identifier

      'Agdesc_t'

  Agdesc_t arg2 ;

  ^

pygraphviz/graphviz_wrap.c:2748:3: error: use of undeclared identifier

      'Agdisc_t'

  Agdisc_t *arg3 = (Agdisc_t *) 0 ;

  ^

pygraphviz/graphviz_wrap.c:2748:13: error: use of undeclared identifier 'arg3'

  Agdisc_t *arg3 = (Agdisc_t *) 0 ;

            ^

pygraphviz/graphviz_wrap.c:2748:21: error: use of undeclared identifier

      'Agdisc_t'

  Agdisc_t *arg3 = (Agdisc_t *) 0 ;

                    ^

pygraphviz/graphviz_wrap.c:2748:31: error: expected expression

  Agdisc_t *arg3 = (Agdisc_t *) 0 ;

                              ^

pygraphviz/graphviz_wrap.c:2749:3: error: use of undeclared identifier

      'Agraph_t'

  Agraph_t *result = 0 ;

  ^

pygraphviz/graphviz_wrap.c:2749:13: error: use of undeclared identifier 'result'

  Agraph_t *result = 0 ;

            ^

pygraphviz/graphviz_wrap.c:2775:7: error: use of undeclared identifier 'arg2'

      arg2 = *((Agdesc_t *)(argp2));

      ^

pygraphviz/graphviz_wrap.c:2775:17: error: use of undeclared identifier

      'Agdesc_t'

      arg2 = *((Agdesc_t *)(argp2));

                ^

pygraphviz/graphviz_wrap.c:2775:27: error: expected expression

      arg2 = *((Agdesc_t *)(argp2));

                          ^

pygraphviz/graphviz_wrap.c:2782:3: error: use of undeclared identifier 'arg3'

  arg3 = (Agdisc_t *)(argp3);

  ^

pygraphviz/graphviz_wrap.c:2782:11: error: use of undeclared identifier

      'Agdisc_t'

  arg3 = (Agdisc_t *)(argp3);

          ^

pygraphviz/graphviz_wrap.c:2782:21: error: expected expression

  arg3 = (Agdisc_t *)(argp3);

                    ^

pygraphviz/graphviz_wrap.c:2783:3: error: use of undeclared identifier 'result'

  result = (Agraph_t *)agopen(arg1,arg2,arg3);

  ^

pygraphviz/graphviz_wrap.c:2783:13: error: use of undeclared identifier

      'Agraph_t'

  result = (Agraph_t *)agopen(arg1,arg2,arg3);

            ^

pygraphviz/graphviz_wrap.c:2783:23: error: expected expression

  result = (Agraph_t *)agopen(arg1,arg2,arg3);

                      ^

pygraphviz/graphviz_wrap.c:2784:50: error: use of undeclared identifier 'result'

  resultobj = SWIG_NewPointerObj(SWIG_as_voidptr(result), ...

                                                 ^

pygraphviz/graphviz_wrap.c:2476:52: note: expanded from macro 'SWIG_as_voidptr'

#define SWIG_as_voidptr(a) (void *)((const void *)(a)) 

                                                   ^

pygraphviz/graphviz_wrap.c:975:83: note: expanded from macro

      'SWIG_NewPointerObj'

  ...type, flags)            SWIG_Python_NewPointerObj(ptr, type, flags)

                                                       ^

fatal error: too many errors emitted, stopping now [-ferror-limit=]

3 warnings and 20 errors generated.

error: command 'clang' failed with exit status 1

Any suggestions/