Installation (Lion)
PKG_CONFIG_PATH=$PKG_CONFIG_PATH:/usr/local/lib/pkgconfig:/usr/local/opt/cairo/lib/pkgconfig:/usr/local/opt/pixman/lib/pkgconfig:/usr/local/opt/fontconfig/lib/pkgconfig:/usr/local/opt/freetype/lib/pkgconfig:/usr/local/opt/libpng/lib/pkgconfig:/usr/X11/lib/pkgconfignpm install