diff --git a/lib/ChangeLog b/lib/ChangeLog
index ec826e4f11..2977dcf0a3 100644
--- a/lib/ChangeLog
+++ b/lib/ChangeLog
@@ -1,3 +1,7 @@
+2005-06-15  Uwe Stöhr  <uwestoehr@web.de>
+
+	* configure.m4: add viewers for pdf2 and pdf3.
+
 2005-06-14  Jean-Marc Lasgouttes  <lasgouttes@lyx.org>
 
 	* configure.m4: remove texput.log after testing for spaces.
diff --git a/lib/configure.m4 b/lib/configure.m4
index 2b2b34a9f3..cd48d751d5 100644
--- a/lib/configure.m4
+++ b/lib/configure.m4
@@ -608,6 +608,8 @@ cat >$outfile <<EOF
 \\viewer dvi "$DVI_VIEWER"
 \\viewer html "$HTML_VIEWER"
 \\viewer pdf "$PDF_VIEWER"
+\\viewer pdf2 "$PDF_VIEWER"
+\\viewer pdf3 "$PDF_VIEWER"
 \\viewer ps "$PS_VIEWER"
 \\viewer eps "$EPS_VIEWER"