package/ecryptfs-utils: add libgpgme optional dependency

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
(cherry picked from commit e122d962a1415fb595286ad71771701f9860765d)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/ecryptfs-utils/ecryptfs-utils.mk

@@ -16,6 +16,15 @@ ECRYPTFS_UTILS_CONF_OPTS = --disable-pywrap
 
 ECRYPTFS_UTILS_CONF_ENV = ac_cv_path_POD2MAN=true
 
+ifeq ($(BR2_PACKAGE_LIBGPGME),y)
+ECRYPTFS_UTILS_CONF_OPTS += \
+	--enable-gpg \
+	--with-gpgme-prefix=$(STAGING_DIR)/usr
+ECRYPTFS_UTILS_DEPENDENCIES += libgpgme
+else
+ECRYPTFS_UTILS_CONF_OPTS += --disable-gpg
+endif
+
 ifeq ($(BR2_PACKAGE_LINUX_PAM),y)
 ECRYPTFS_UTILS_CONF_OPTS += --enable-pam
 ECRYPTFS_UTILS_DEPENDENCIES += linux-pam