Why SVG icons not work?

[yoursaf]

When I upgrade to fvwm3,all SVG format icons can't display.
+ "%google-chrome.svg%&Chrome" Exec exec $[fvwm_browser]
or
+ "%utilities-terminal.svg:$[icon_size]%&Urxvt" Exec exec urxvt

those 2 format code all not work.
Please help me fix this issue.
TYVM

[ONykyf]

Because there is a bug that prevents an SVG icon from loading if it lacks specified viewport. A patch that solves it is attached.
fvwm3-1.1.2-rsvg-dimensions.patch.gz