---
 src/Filelists.cmake |    2 ++
 1 file changed, 2 insertions(+)

--- a/src/Filelists.cmake
+++ b/src/Filelists.cmake
@@ -264,6 +264,8 @@ if (DOXYGEN_FOUND)
         VERBATIM)
 else (DOXYGEN_FOUND)
     message("Doxygen needs to be installed to generate the doxygen documentation")
+    add_custom_target(lwipdocs
+        COMMAND true)
 endif (DOXYGEN_FOUND)
 
 # lwIP libraries
