diff --git a/util/OSPixmap.h b/util/OSPixmap.h
index 47cd53175..cf2c2b574 100644
--- a/util/OSPixmap.h
+++ b/util/OSPixmap.h
@@ -9,8 +9,6 @@
 #ifndef SAMPLE_UTIL_PIXMAP_H_
 #define SAMPLE_UTIL_PIXMAP_H_
 
-#include <stdlib.h>
-
 #include <EGL/egl.h>
 #include <EGL/eglext.h>
 
diff --git a/util/linux/Linux_system_utils.cpp b/util/linux/Linux_system_utils.cpp
index bd6c7afb7..5f47e55e4 100644
--- a/util/linux/Linux_system_utils.cpp
+++ b/util/linux/Linux_system_utils.cpp
@@ -8,6 +8,7 @@
 
 #include "system_utils.h"
 
+#include <sys/resource.h>
 #include <sys/stat.h>
 #include <sys/time.h>
 #include <sys/types.h>
diff --git a/util/osx/OSXPixmap.h b/util/osx/OSXPixmap.h
deleted file mode 100644
index f9cdfdcbf..000000000
--- a/util/osx/OSXPixmap.h
+++ /dev/null
@@ -1,14 +0,0 @@
-//
-// Copyright (c) 2015 The ANGLE Project Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-//
-
-// OSXPixmap.h: Definition of the implementation of OSPixmap for OSX
-
-#ifndef UTIL_OSX_PIXMAP_H_
-#define UTIL_OSX_PIXMAP_H_
-
-#include "OSPixmap.h"
-
-#endif // UTIL_OSX_PIXMAP_H_
diff --git a/util/osx/OSXPixmap.mm b/util/osx/OSXPixmap.mm
deleted file mode 100644
index 16af8bf37..000000000
--- a/util/osx/OSXPixmap.mm
+++ /dev/null
@@ -1,15 +0,0 @@
-//
-// Copyright (c) 2015 The ANGLE Project Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-//
-
-// OSXPixmap.cpp: Implementation of OSPixmap for OSX
-
-#include "osx/OSXPixmap.h"
-
-// TODO(cwallez) find out the native OSX pixmap type and implement this
-OSPixmap *CreateOSPixmap()
-{
-    return nullptr;
-}
diff --git a/util/posix/Posix_system_utils.cpp b/util/posix/Posix_system_utils.cpp
index 71623f000..ae4f79d22 100644
--- a/util/posix/Posix_system_utils.cpp
+++ b/util/posix/Posix_system_utils.cpp
@@ -8,10 +8,8 @@
 
 #include "system_utils.h"
 
-#include <sys/resource.h>
 #include <sched.h>
 #include <time.h>
-#include <unistd.h>
 
 namespace angle
 {
@@ -36,9 +34,4 @@ void Sleep(unsigned int milliseconds)
     }
 }
 
-void SetLowPriorityProcess()
-{
-    setpriority(PRIO_PROCESS, getpid(), 10);
-}
-
 } // namespace angle
diff --git a/util/util.gyp b/util/util.gyp
index 7b8b1d1e9..b03adcf19 100644
--- a/util/util.gyp
+++ b/util/util.gyp
@@ -54,8 +54,6 @@
             'osx/OSX_system_utils.cpp',
             'osx/OSXTimer.cpp',
             'osx/OSXTimer.h',
-            'osx/OSXPixmap.mm',
-            'osx/OSXPixmap.h',
             'osx/OSXWindow.mm',
             'osx/OSXWindow.h',
             'posix/Posix_system_utils.cpp',
diff --git a/util/x11/X11Pixmap.h b/util/x11/X11Pixmap.h
index fd12db624..d34382ad5 100644
--- a/util/x11/X11Pixmap.h
+++ b/util/x11/X11Pixmap.h
@@ -29,4 +29,4 @@ class X11Pixmap : public OSPixmap
     Display *mDisplay;
 };
 
-#endif // UTIL_X11_PIXMAP_H_
+#endif // UTIL_WIN32_PIXMAP_H_