optional_depends  "libggi" "--with-ggi=/usr" "" "GGI is installed "                &&
optional_depends  "svgalib" "--with-svga=/usr" "" "SVGALib is installed"           &&
optional_depends  "X11-LIBS"  "--with-x" "--with-x=no" "To use the X Window System" &&
optional_depends  "GLUT" "--with-glut" "--without-glut" "for OpenGL Utility Toolkit support"
