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wget 'https://webp.googlecode.com/files/libwebp-0.4.0.tar.gz'
tar -xzvf libwebp-0.4.0.tar.gz
cd libwebp-0.4.0
 ./configure
 make
 make install

cp graphicsmagick-webp-patch/patch/gm-1.3.18-webp.patch /opt/GraphicsMagick-1.3.18/

cd /opt/GraphicsMagick-1.3.18/
patch -p1 < gm-1.3.18-webp.patch

./configure --enable-shared
make
make install

WEBP  --with-webp=yes  yes

gm convert foo.jpg bar.webp
gm identify bar.webp

Copyright (C) 2003, 2013 GraphicsMagick Group
Copyright (C) 2002 ImageMagick Studio
Copyright 1991-1999 E. I. du Pont de Nemours and Company

This program is covered by multiple licenses, which are described in
Copyright.txt. You should have received a copy of Copyright.txt with this
package; otherwise see http://www.graphicsmagick.org/www/Copyright.html.