two compilation fixes

CMakeLists.txt

diff --git a/CMakeLists.txt b/CMakeLists.txt
index f304401..c534a0f 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -78,7 +78,7 @@
 
 option(EIGEN_TEST_NO_EXPLICIT_VECTORIZATION "Disable explicit vectorization in tests/examples" OFF)
 if(EIGEN_TEST_NO_EXPLICIT_VECTORIZATION)
-  add_definitions(EIGEN_DONT_VECTORIZE=1)
+  add_definitions(-DEIGEN_DONT_VECTORIZE=1)
   message("Disabling vectorization in tests/examples")
 endif(EIGEN_TEST_NO_EXPLICIT_VECTORIZATION)