depends  freetype2  &&
depends  xerces-c   &&

optional_depends  OPENGL                       \
                  "--enable-opengl-renderer"   \
                  "--disable-opengl-renderer"  \
                  "for an OpenGL renderer"     &&

optional_depends  devil                             \
                  "--with-devil"                    \
                  "--without-devil"                 \
                  "for DevIL OpenGL image loading"
