AC_ARG_ENABLE(svg, [ --disable-svg disable Scalable Vector Graphics], enable_svg=$enableval, enable_svg=yes)
AC_ARG_ENABLE(svg2png, [ --disable-svg2png disable conversion of svgs to pngs], enable_svg2png=$enableval, enable_svg2png=yes)
AC_ARG_ENABLE(svg2png-scaling, [ --enable-svg2png-scaling enable conversion of svgs to pngs with specified sizes], SVG2PNG_SCALES=$enableval, SVG2PNG_SCALES="8 16 32 48 96")
-AC_ARG_ENABLE(svg2png-scaling-flag, [ --enable-svg2png-scaling-flag enable conversion of flag svgs to pngs with specified sizes], SVG2PNG_SCALES_FLAG=$enableval, SVG2PNG_SCALES_FLAG="")
-AC_ARG_ENABLE(svg2png-scaling-nav, [ --enable-svg2png-scaling-nav enable conversion of nav svgs to pngs with specified sizes], SVG2PNG_SCALES_NAV=$enableval, SVG2PNG_SCALES_NAV="")
+AC_ARG_ENABLE(svg2png-scaling-flag, [ --enable-svg2png-scaling-flag enable conversion of flag svgs to pngs with specified sizes], SVG2PNG_SCALES_FLAG=$enableval, SVG2PNG_SCALES_FLAG="8 16 32 48 96")
+AC_ARG_ENABLE(svg2png-scaling-nav, [ --enable-svg2png-scaling-nav enable conversion of nav svgs to pngs with specified sizes], SVG2PNG_SCALES_NAV=$enableval, SVG2PNG_SCALES_NAV="8 16 32 48 96")
AC_ARG_WITH(svg2png-use-convert, [ --with-svg2png-use-convert use imagemagick's convert for png creation], SVG2PNG_CONVERTER="convert")
AC_ARG_WITH(svg2png-use-rsvg-convert, [ --with-svg2png-use-rsvg-convert use librsvg's rsvg-convert for png creation], SVG2PNG_CONVERTER="rsvg-convert")
AC_ARG_WITH(svg2png-use-inkscape, [ --with-svg2png-use-inkscape use inkscapes internal convert routines for png creation], SVG2PNG_CONVERTER="inkscape")