diff --git a/doc/Doxyfile.in b/doc/Doxyfile.in
--- a/doc/Doxyfile.in
+++ b/doc/Doxyfile.in
@@ -114,7 +114,7 @@
 #---------------------------------------------------------------------------
 # configuration options related to source browsing
 #---------------------------------------------------------------------------
-SOURCE_BROWSER         = NO
+SOURCE_BROWSER         = @LEMON_DOC_SOURCE_BROWSER@
 INLINE_SOURCES         = NO
 STRIP_CODE_COMMENTS    = YES
 REFERENCED_BY_RELATION = NO