commit 7202b142891ee10771af9f1f3063664d75a38bbc
Author: hasufell <hasufell@gentoo.org>
Date:   Thu Sep 5 12:28:30 2013 +0200

    Use system wavpack. Based on patch from Gentoo Bugzilla
    
    From: Azamat H. Hackimov <azamat.hackimov@gmail.com>
    
    https://bugs.gentoo.org/show_bug.cgi?id=363395

diff --git a/bam.lua b/bam.lua
index 11ac7b9..35c1d8d 100644
--- a/bam.lua
+++ b/bam.lua
@@ -11,6 +11,7 @@ config:Add(OptTestCompileC("stackprotector", "int main(){return 0;}", "-fstack-p
 config:Add(OptTestCompileC("minmacosxsdk", "int main(){return 0;}", "-mmacosx-version-min=10.5 -isysroot /Developer/SDKs/MacOSX10.5.sdk"))
 config:Add(OptTestCompileC("macosxppc", "int main(){return 0;}", "-arch ppc"))
 config:Add(OptLibrary("zlib", "zlib.h", false))
+config:Add(OptLibrary("wavpack", "wavpack/wavpack.h", false))
 config:Add(SDL.OptFind("sdl", true))
 config:Add(FreeType.OptFind("freetype", true))
 config:Finalize("config.lua")
@@ -187,7 +188,7 @@ function build(settings)
 	end
 
 	-- compile zlib if needed
-	if config.zlib.value == 1 then
+	if config.zlib.value == true then
 		settings.link.libs:Add("z")
 		if config.zlib.include_path then
 			settings.cc.includes:Add(config.zlib.include_path)
@@ -198,8 +199,18 @@ function build(settings)
 		settings.cc.includes:Add("src/engine/external/zlib")
 	end
 
+	if config.wavpack.value == true then
+		settings.link.libs:Add("wavpack")
+		if config.wavpack.include_path then
+			settings.cc.includes:Add(config.wavpack.include_path)
+		end
+		wavpack = {}
+	else
+		wavpack = Compile(settings, Collect("src/engine/external/wavpack/*.c"))
+		settings.cc.includes:Add("src/engine/external/") --The header is wavpack/wavpack.h so include the external folder
+	end
+
 	-- build the small libraries
-	wavpack = Compile(settings, Collect("src/engine/external/wavpack/*.c"))
 	pnglite = Compile(settings, Collect("src/engine/external/pnglite/*.c"))
 
 	-- build game components
diff --git a/src/engine/client/sound.cpp b/src/engine/client/sound.cpp
index 343fa2e..e32cac9 100644
--- a/src/engine/client/sound.cpp
+++ b/src/engine/client/sound.cpp
@@ -13,7 +13,7 @@
 #include "sound.h"
 
 extern "C" { // wavpack
-	#include <engine/external/wavpack/wavpack.h>
+	#include <wavpack/wavpack.h>
 }
 #include <math.h>
 
@@ -351,19 +351,25 @@ int CSound::LoadWV(const char *pFilename)
 	if(!m_pStorage)
 		return -1;
 
+	#ifndef WAVPACK_H
 	ms_File = m_pStorage->OpenFile(pFilename, IOFLAG_READ, IStorage::TYPE_ALL);
 	if(!ms_File)
 	{
 		dbg_msg("sound/wv", "failed to open file. filename='%s'", pFilename);
 		return -1;
 	}
+	#endif
 
 	SampleID = AllocID();
 	if(SampleID < 0)
 		return -1;
 	pSample = &m_aSamples[SampleID];
 
+	#ifndef WAVPACK_H
 	pContext = WavpackOpenFileInput(ReadData, aError);
+	#else
+	pContext = WavpackOpenFileInput(pFilename, aError, 0, 0);
+	#endif
 	if (pContext)
 	{
 		int m_aSamples = WavpackGetNumSamples(pContext);
@@ -419,8 +425,10 @@ int CSound::LoadWV(const char *pFilename)
 		dbg_msg("sound/wv", "failed to open %s: %s", pFilename, aError);
 	}
 
+	#ifndef WAVPACK_H
 	io_close(ms_File);
 	ms_File = NULL;
+	#endif
 
 	if(g_Config.m_Debug)
 		dbg_msg("sound/wv", "loaded %s", pFilename);