diff --git a/cmake/OpenCVFindLibsPerf.cmake b/cmake/OpenCVFindLibsPerf.cmake
index 4c12304687..6772c79b87 100644
--- a/cmake/OpenCVFindLibsPerf.cmake
+++ b/cmake/OpenCVFindLibsPerf.cmake
@@ -32,7 +32,7 @@ endif(WITH_CUDA)
 # --- Eigen ---
 if(WITH_EIGEN)
   find_path(EIGEN_INCLUDE_PATH "Eigen/Core"
-            PATHS /usr/local /opt /usr ENV ProgramFiles ENV ProgramW6432
+            PATHS /usr/local /opt /usr $ENV{EIGEN_ROOT}/include ENV ProgramFiles ENV ProgramW6432 
             PATH_SUFFIXES include/eigen3 include/eigen2 Eigen/include/eigen3 Eigen/include/eigen2
             DOC "The path to Eigen3/Eigen2 headers"
             CMAKE_FIND_ROOT_PATH_BOTH)
diff --git a/modules/core/src/parallel.cpp b/modules/core/src/parallel.cpp
index 918fa0bb10..014b107106 100644
--- a/modules/core/src/parallel.cpp
+++ b/modules/core/src/parallel.cpp
@@ -322,6 +322,7 @@ int cv::getNumThreads(void)
 
 void cv::setNumThreads( int threads )
 {
+    (void)threads;
 #ifdef HAVE_PARALLEL_FRAMEWORK
     numThreads = threads;
 #endif