Index: configure.ac
--- configure.ac.orig
+++ configure.ac
@@ -77,7 +77,7 @@ case "${host_os}" in
     GVPLUGIN_VERSION=`expr $GVPLUGIN_CURRENT + 1`
     ;;
   * )
-    GVPLUGIN_VERSION=$GVPLUGIN_CURRENT
+    GVPLUGIN_VERSION=$GVPLUGIN_CURRENT.0
     ;;
 esac
 AC_DEFINE_UNQUOTED(GVPLUGIN_VERSION,$GVPLUGIN_VERSION,[Compatibility version number for plugins.])
@@ -642,7 +642,7 @@ else
       if test "x$GUILE_CONFIG" = "x"; then
         use_guile="No (guile not available)"
       else
-        [GUILE_VERSION=`$GUILE_CONFIG --version 2>&1 | sed -n '1 s/^.* \+\([0-9\.]\+\)$/\1/ p'`]
+        [GUILE_VERSION=`$GUILE_CONFIG --version 2>&1 | sed -En '1 s/^.* +([0-9\.]+)$/\1/ p'`]
         GUILE_VERSION_MAJOR=`echo $GUILE_VERSION | cut -d '.' -f 1`
         GUILE_VERSION_MINOR=`echo $GUILE_VERSION | cut -d '.' -f 2`
         AC_CHECK_PROGS(GUILE,guile$GUILE_VERSION_MAJOR.$GUILE_VERSION_MINOR guile$GUILE_VERSION_MAJOR guile)