enlightenment: Alsa backend needs mixer support

Fixes http://autobuild.buildroot.net/results/3d6e35e3cda9428cc422b4f6203ba912bdc11faf/

Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

package/enlightenment/enlightenment.mk

@@ -28,6 +28,13 @@ ENLIGHTENMENT_CONF_OPT = --with-edje-cc=$(HOST_DIR)/usr/bin/edje_cc \
 			 --with-eet-eet=$(HOST_DIR)/usr/bin/eet \
 			 --disable-rpath
 
+# alsa backend needs mixer support
+ifeq ($(BR2_PACKAGE_ALSA_LIB)$(BR2_PACKAGE_ALSA_LIB_MIXER),yy)
+ENLIGHTENMENT_DEPENDENCIES += alsa-lib
+else
+ENLIGHTENMENT_CONF_ENV += enable_alsa=no
+endif
+
 ifeq ($(BR2_HAVE_DOCUMENTATION),)
 define ENLIGHTENMENT_REMOVE_DOCUMENTATION
 	rm -rf $(TARGET_DIR)/usr/share/enlightenment/doc/