--- swift/docs/CMakeLists.txt.orig	2016-03-21 17:35:26 UTC
+++ swift/docs/CMakeLists.txt
@@ -10,7 +10,6 @@ SET(SWIFT_SPHINX_PAPER_SIZE "letter"
   CACHE STRING "Paper size for generated documentation")
 
 SET(SPHINX_ARGS
-  -W
   -D latex_paper_size=${SWIFT_SPHINX_PAPER_SIZE}
   -d ${CMAKE_BINARY_DIR}/doctrees)
 
