diff --git a/CMakeLists.txt b/CMakeLists.txt
index 6e7d5c2f7d..079d8482ce 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -10,12 +10,6 @@
 
 cmake_minimum_required(VERSION 2.8.11)
 
-if (NOT APPVEYOR)
-if (WIN32 AND (CMAKE_VERSION VERSION_EQUAL 3.6 OR (CMAKE_VERSION VERSION_GREATER 3.6 AND CMAKE_VERSION VERSION_LESS 3.7)))
-    message(FATAL_ERROR "You have bugged CMake version 3.6 which is known to not work with tesseract. Please, upgrade CMake.")
-endif()
-endif()
-
 # In-source builds are disabled.
 if (${CMAKE_SOURCE_DIR} STREQUAL ${CMAKE_BINARY_DIR})
     message(FATAL_ERROR
@@ -88,9 +82,6 @@ if (WIN32)
         add_definitions(-D_CRT_SECURE_NO_WARNINGS)
 
         set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /MP")
-        if (APPVEYOR)
-            set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /W0")
-        endif()
     endif()
 
     set(LIB_Ws2_32 Ws2_32)