not compilable with msvc :(
diff --git a/unsupported/doc/CMakeLists.txt b/unsupported/doc/CMakeLists.txt
index e8f6985..efdf94f 100644
--- a/unsupported/doc/CMakeLists.txt
+++ b/unsupported/doc/CMakeLists.txt
@@ -1,2 +1,3 @@
-
-add_subdirectory(examples)
+if(NOT MSVC)
+  add_subdirectory(examples)
+endif(NOT MSVC)