add try_preinstalled() and try_native() methods

diff --git a/config_files/docutils-0.3.7.sh b/config_files/docutils-0.3.7.sh
index 2237677270605081b6b8bacf3baca7a2eeaa77e0..126cf5449a2db1e52c54d70e628afd4367cc721d 100755 (executable)
--- a/config_files/docutils-0.3.7.sh
+++ b/config_files/docutils-0.3.7.sh
@@ -16,6 +16,15 @@ EOF
 make_env ${INSTALL_ROOT} ${INSTALL_WORK} "${PRODUCT_SEQUENCE}"
 }
 
+try_native(){
+return 1
+}
+
+try_preinstalled(){
+try_existing ${PRODUCT_DIR} ${INSTALL_ROOT} ${INSTALL_WORK} "${PRODUCT_SEQUENCE}" ${PRODUCT_TYPE}
+return $?
+}
+
 install_source()
 {
 make_env ${INSTALL_ROOT} ${INSTALL_WORK} "${PRODUCT_SEQUENCE}" ${PRODUCT_TYPE}