package/graphicsmagick: add support for webp image format

Signed-off-by: Grzegorz Blach <grzegorz@blach.pl>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/graphicsmagick/graphicsmagick.mk

@@ -27,7 +27,6 @@ GRAPHICSMAGICK_CONF_OPTS = \
 	--without-jbig \
 	--without-perl \
 	--without-trio \
-	--without-webp \
 	--without-wmf \
 	--without-x \
 	--with-gs-font-dir=/usr/share/fonts/gs
@@ -85,6 +84,13 @@ else
 GRAPHICSMAGICK_CONF_OPTS += --without-tiff
 endif
 
+ifeq ($(BR2_PACKAGE_WEBP_MUX),y)
+GRAPHICSMAGICK_CONF_OPTS += --with-webp
+GRAPHICSMAGICK_DEPENDENCIES += webp
+else
+GRAPHICSMAGICK_CONF_OPTS += --without-webp
+endif
+
 ifeq ($(BR2_PACKAGE_XZ),y)
 GRAPHICSMAGICK_CONF_OPTS += --with-lzma
 GRAPHICSMAGICK_DEPENDENCIES += xz