optional_depends "bzip2"        "--with-bzip2"          "--without-bzip2"        "for file compression support"
optional_depends "zlib"         "--with-zlib"           "--without-zlib"         "for zlib compression support"
optional_depends "mesa-lib"     "--with-mesa"           "--with-opengl"          "for MesaGL support (no=use OpenGL)"
optional_depends "freetype2"    "--with-freetype"       "--without-freetype"     "for freetype font support"
optional_depends "fontconfig"   "--with-fontconfig"     "--without-freeconfig"   "for various font support"
optional_depends "openal"       "--with-openal"         "--without-openal"       "for 3D audio support"
optional_depends "expat"        "--enable-system-expat" "--disable-system-expat" "for system use of expat support"
optional_depends "spidermonkey" "--with-spidermonkey"   "--without-spidermonkey" "C implementation of JavaScript support"
optional_depends "%JAVA_SDK"    "--enable-java-wrapper" "--disable-java-wrapper" "enable building java wrapper"
optional_depends "SoQt"         "--with-simage"         "--without-simage"       "for Coin high-level 3D visualization support (say no if Coin is not installed)"

optional_depends "doxygen"      "--with-doxygen --enable-man --enable-html" "--without-doxygen --disable-man --disable-html" "for documentation support"

