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diff --git a/src/fake-quartz-cg.h b/src/fake-quartz-cg.h
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+/**
+ * libgamma — Display server abstraction layer for gamma ramp adjustments
+ * Copyright © 2014  Mattias Andrée (maandree@member.fsf.org)
+ * 
+ * This library is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ * 
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this library.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef LIBGAMMA_FAKE_QUARTZ_CG_H
+#define LIBGAMMA_FAKE_QUARTZ_CG_H
+
+#ifndef FAKE_GAMMA_METHOD_QUARTZ_CORE_GRAPHICS
+# error Including fake-quartz-cg.h without FAKE_GAMMA_METHOD_QUARTZ_CORE_GRAPHICS
+#endif
+
+
+/* This header file contains some capabilities of
+ * <CoreGraphics/CGDirectDisplay.h> and <CoreGraphics/CGError.h>,
+ * and can be used modify gamma ramps without Mac OS X and Quartz
+ * but with its API.
+ * 
+ * The content of this file is based on the documentation found on:
+ * 
+ * https://developer.apple.com/library/mac/documentation/GraphicsImaging/Reference/Quartz_Services_Ref/Reference/reference.html
+ * 
+ * https://developer.apple.com/library/mac/documentation/CoreGraphics/Reference/CoreGraphicsConstantsRef/Reference/reference.html#//apple_ref/c/tdef/CGError */
+
+
+#include <stdint.h>
+
+
+typedef int32_t CGError;
+#define kCGErrorSuccess 0
+
+typedef float CGGammaValue;
+typedef uint32_t CGDirectDisplayID;
+
+
+CGError CGGetOnlineDisplayList(uint32_t max_size, CGDirectDisplayID* displays_out, uint32_t* count_out);
+
+CGError CGSetDisplayTransferByTable(CGDirectDisplayID display, uint32_t gamma_size, const CGGammaValue* red,
+				    const CGGammaValue* green, const CGGammaValue* blue);
+
+CGError CGGetDisplayTransferByTable(CGDirectDisplayID display, uint32_t gamma_size, CGGammaValue* red,
+				    CGGammaValue* green, CGGammaValue* blue, uint32_t* gamma_size_out);
+
+void CGDisplayRestoreColorSyncSettings(void);
+
+uint32_t CGDisplayGammaTableCapacity(CGDirectDisplayID display) __attribute__((const));
+
+
+/* The follow part most only be used when this module is used,
+ * it cannot be used when the real CoreGraphics is used.
+ * CoreGraphics does not have this function, it is added so
+ * that there is a way to cleanly close the X connection
+ * and free resources needed by this module. */
+void close_fake_quartz_cg(void);
+
+
+#endif
+