1. WEBP is supported! git clone https://chromium.googlesource.com/webm/libwebp
./autogen.sh
./configure
./make
./make install

2. fix world module built error!
-DWITH_OPENGL:BOOL="1" -DWITH_GTK:BOOL="1" -DWITH_GTK_2_X:BOOL="1" -DWITH_WEBP:BOOL="1" -DBUILD_WEBP:BOOL="1"