Index: cmake/OpenCVPCHSupport.cmake
--- cmake/OpenCVPCHSupport.cmake.orig
+++ cmake/OpenCVPCHSupport.cmake
@@ -15,7 +15,7 @@
 IF(CV_GCC)
 
     IF(NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS "4.2.0")
-        SET(PCHSupport_FOUND TRUE)
+        SET(PCHSupport_FOUND FALSE)
     ENDIF()
 
     SET(_PCH_include_prefix "-I")