checkdeps: add libjson-perl

scripts/checkdeps

@@ -62,6 +62,11 @@ case "$DISTRO" in
       ;;
 esac
 
+if ! perl -MJSON -e 'exit(0);' 2>/dev/null; then
+  files="$files perl/JSON.pm"
+  files_pkg="$files_pkg libjson-perl"
+fi
+
 # project specific dependencies
 if [ -n "$EXTRA_DEPS" ] ; then
   deps="$deps $EXTRA_DEPS"
@@ -96,7 +101,7 @@ done
 
 if [ -n "$need" ]; then
   echo "**** Your system lacks the following tools needed to build $DISTRONAME ****"
-  echo $need
+  echo $need provided by $need_pkg
   echo "**** You seem to use a $DISTRO system ****"
 
   case "$DISTRO" in