diff --git a/doc/CMakeLists.txt b/doc/CMakeLists.txt
--- a/doc/CMakeLists.txt
+++ b/doc/CMakeLists.txt
@@ -3,6 +3,8 @@
 SET(abs_top_srcdir ${PROJECT_SOURCE_DIR})
 SET(abs_top_builddir ${PROJECT_BINARY_DIR})
 
+SET(LEMON_DOC_SOURCE_BROWSER "NO" CACHE STRING "Include source into the doc (YES/NO).")
+
 CONFIGURE_FILE(
   ${PROJECT_SOURCE_DIR}/doc/Doxyfile.in
   ${PROJECT_BINARY_DIR}/doc/Doxyfile
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