diff -r 9c7639f3a741 -r 257e91516e09 CMakeLists.txt
--- a/CMakeLists.txt	Fri May 29 12:44:37 2009 +0100
+++ b/CMakeLists.txt	Fri May 29 17:46:48 2009 +0100
@@ -15,6 +15,9 @@
     ERROR_QUIET
     OUTPUT_STRIP_TRAILING_WHITESPACE
   )
+  IF(HG_REVISION STREQUAL "")
+    SET(HG_REVISION "hg-tip")
+  ENDIF()
   SET(LEMON_VERSION ${HG_REVISION} CACHE STRING "LEMON version string.")
 ENDIF()