Index: Modules/Compiler/GNU.cmake
--- Modules/Compiler/GNU.cmake.orig	2017-04-10 17:23:06.000000000 +0200
+++ Modules/Compiler/GNU.cmake	2017-04-11 07:44:51.480972000 +0200
@@ -37,8 +37,8 @@
   # Initial configuration flags.
   string(APPEND CMAKE_${lang}_FLAGS_INIT " ")
   string(APPEND CMAKE_${lang}_FLAGS_DEBUG_INIT " -g")
-  string(APPEND CMAKE_${lang}_FLAGS_MINSIZEREL_INIT " -Os -DNDEBUG")
-  string(APPEND CMAKE_${lang}_FLAGS_RELEASE_INIT " -O3 -DNDEBUG")
+  string(APPEND CMAKE_${lang}_FLAGS_MINSIZEREL_INIT " -O2 -DNDEBUG")
+  string(APPEND CMAKE_${lang}_FLAGS_RELEASE_INIT " -O2 -DNDEBUG")
   string(APPEND CMAKE_${lang}_FLAGS_RELWITHDEBINFO_INIT " -O2 -g -DNDEBUG")
   set(CMAKE_${lang}_CREATE_PREPROCESSED_SOURCE "<CMAKE_${lang}_COMPILER> <DEFINES> <INCLUDES> <FLAGS> -E <SOURCE> > <PREPROCESSED_SOURCE>")
   set(CMAKE_${lang}_CREATE_ASSEMBLY_SOURCE "<CMAKE_${lang}_COMPILER> <DEFINES> <INCLUDES> <FLAGS> -S <SOURCE> -o <ASSEMBLY_SOURCE>")
Index: Source/cmGlobalNinjaGenerator.cxx
--- Source/cmGlobalNinjaGenerator.cxx.orig	2017-04-10 17:23:07.000000000 +0200
+++ Source/cmGlobalNinjaGenerator.cxx	2017-04-11 07:44:51.481317000 +0200
@@ -1,5 +1,11 @@
 /* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
    file Copyright.txt or https://cmake.org/licensing for details.  */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+
 #include "cmGlobalNinjaGenerator.h"
 
 #include <algorithm>
Index: Source/kwsys/Encoding.h.in
--- Source/kwsys/Encoding.h.in.orig	2017-04-11 07:44:51.481489000 +0200
+++ Source/kwsys/Encoding.h.in	2017-04-11 07:48:03.820448000 +0200
@@ -5,6 +5,7 @@
 
 #include <@KWSYS_NAMESPACE@/Configure.h>
 
+#include <stdlib.h>
 #include <wchar.h>
 
 /* Redefine all public interface symbol names to be in the proper