If you are working with VRML and need execute some app on OSX with simpleVRML (binary file), don't waste your time compiling VRML dev libraries, go here:

1.) Download appropriate package (depending of your OS) from http://www.artoolworks.com/dist/openvrml/0.16.6/
2.) Unzip the downloaded file.
3.) Open the "unzipped" folder and copy all files under libs/ to /usr/local/lib
4.) Check versions and make symbolic links to required libraries, by example:

$ cd /usr/local/lib
$ sudo ln -s libopenvrml.6.1.5.dylib libopenvrml.6.1.2.dylib
$ sudo ln -s libopenvrml-gl.6.0.7.dylib libopenvrml-gl.6.0.4.dylib
$ sudo ln -s libpng12.0.18.0.dylib libpng12.0.12.0.dylib

Voulá!