diff --git a/build/workspaces/required-libraries-linux.txt b/build/workspaces/required-libraries-linux.txt
index e605b1c0f7..d8e3814e46 100755
--- a/build/workspaces/required-libraries-linux.txt
+++ b/build/workspaces/required-libraries-linux.txt
@@ -24,8 +24,7 @@ $GL := directory containing OpenGL headers.
 $binaries := directory containing system/ and data/
 
 - OpenGL extensions:
-  download http://www.wildfiregames.com/~code/libraries/glext.h
-  ... and put it in $GL.
+  copy libraries/opengl/include/GL/glext.h to $GL.
 
 - SpiderMonkey [javascript]
   The source is *not* compatible with the mozjs libraries included in mozilla
diff --git a/source/graphics/ObjectBase.cpp b/source/graphics/ObjectBase.cpp
index 60f8485791..f43102a217 100644
--- a/source/graphics/ObjectBase.cpp
+++ b/source/graphics/ObjectBase.cpp
@@ -9,6 +9,7 @@
 #include "ps/XML/Xeromyces.h"
 #include "ps/CLogger.h"
 #include "lib/timer.h"
+#include "lib/rand.h"
 #include "maths/MathUtil.h"
 
 #define LOG_CATEGORY "graphics"
diff --git a/source/graphics/ObjectEntry.cpp b/source/graphics/ObjectEntry.cpp
index 378c5b8bc9..f32348da50 100644
--- a/source/graphics/ObjectEntry.cpp
+++ b/source/graphics/ObjectEntry.cpp
@@ -17,6 +17,7 @@
 #include "ps/XML/XMLWriter.h"
 
 #include "lib/res/file/vfs.h"
+#include "lib/rand.h"
 
 #include <sstream>
 
diff --git a/source/gui/CGUIScrollBarStyle.cpp b/source/gui/CGUIScrollBarStyle.cpp
deleted file mode 100644
index b372e6df02..0000000000
--- a/source/gui/CGUIScrollBarStyle.cpp
+++ /dev/null
@@ -1,8 +0,0 @@
-/*
-SGUIScrollBarStyle
-*/
-
-#include "precompiled.h"
-#include "GUI.h"
-
-using namespace std;
diff --git a/source/lib/external_libraries/openal.h b/source/lib/external_libraries/openal.h
new file mode 100644
index 0000000000..bf8be14d28
--- /dev/null
+++ b/source/lib/external_libraries/openal.h
@@ -0,0 +1,26 @@
+/**
+ * =========================================================================
+ * File        : openal.h
+ * Project     : 0 A.D.
+ * Description : bring in OpenAL header+library, with compatibility fixes
+ * =========================================================================
+ */
+
+// license: GPL; see lib/license.txt
+
+#ifndef INCLUDED_OPENAL
+#define INCLUDED_OPENAL
+
+#ifdef __APPLE__
+# include <OpenAL/al.h>
+# include <OpenAL/alc.h>
+#else
+# include <AL/al.h>
+# include <AL/alc.h>
+#endif
+
+#if MSC_VERSION
+# pragma comment(lib, "openal32.lib")
+#endif
+
+#endif	// #ifndef INCLUDED_OPENAL
diff --git a/source/lib/external_libraries/wxwidgets.h b/source/lib/external_libraries/wxwidgets.h
index 1578bb22d7..c3efc873f0 100644
--- a/source/lib/external_libraries/wxwidgets.h
+++ b/source/lib/external_libraries/wxwidgets.h
@@ -23,55 +23,19 @@ struct HINSTANCE__
 typedef struct HINSTANCE__* HINSTANCE;	// definition as if STRICT were #defined
 
 
-#include "wx/wx.h"
+#include "wx/wxprec.h"
 
 #include "wx/file.h"
 #include "wx/ffile.h"
 #include "wx/filename.h"
 #include "wx/mimetype.h"
-
 #include "wx/statline.h"
-
 #include "wx/debugrpt.h"
 
 #ifdef __WXMSW__
 #include "wx/evtloop.h"     // for SetCriticalWindow()
 #endif // __WXMSW__
 
-
-// automatically link against the required library
-#if MSC_VERSION
-# ifdef NDEBUG
-# else
-#  pragma comment(lib, "wxmsw28ud_core.lib")
-#  pragma comment(lib, "wxmsw28ud_qa.lib")
-#  pragma comment(lib, "wxbase28ud.lib")
-#  pragma comment(lib, "wxbase28ud_xml.lib")
-
-
-//#  pragma comment(lib, "wxbase28ud_net.lib")
-//#  pragma comment(lib, "wxbase28ud_odbc.lib")
-//#  pragma comment(lib, "wxmsw28ud_adv.lib")
-//#  pragma comment(lib, "wxmsw28ud_aui.lib")
-//#  pragma comment(lib, "wxmsw28ud_dbgrid.lib")
-//#  pragma comment(lib, "wxmsw28ud_gl.lib")
-//#  pragma comment(lib, "wxmsw28ud_html.lib")
-//#  pragma comment(lib, "wxmsw28ud_media.lib")
-//#  pragma comment(lib, "wxmsw28ud_richtext.lib")
-//#  pragma comment(lib, "wxmsw28ud_xrc.lib")
-//#  pragma comment(lib, "wxexpatd.lib")
-//#  pragma comment(lib, "wxpngd.lib")
-//#  pragma comment(lib, "wxjpegd.lib")
-//#  pragma comment(lib, "wxtiffd.lib")
-//#  pragma comment(lib, "wxzlibd.lib")
-//#  pragma comment(lib, "wxregexd.lib")
-
-#  pragma comment(lib, "Rpcrt4.lib")	// Uuid
-#  pragma comment(lib, "comctl32.lib")	// ImageList_*
-
-
-# endif	// NDEBUG
-#endif	// MSC_VERSION
-
+// note: wxWidgets already does #pragma comment(lib) to add link targets.
 
 #endif	// #ifndef INCLUDED_WXWIDGETS
diff --git a/source/lib/lib.cpp b/source/lib/lib.cpp
index 80d6907ddc..40004308df 100644
--- a/source/lib/lib.cpp
+++ b/source/lib/lib.cpp
@@ -35,57 +35,6 @@ u16 subusw(u16 x, u16 y)
 //-----------------------------------------------------------------------------
 // rand
 
-// return random integer in [min, max).
-// avoids several common pitfalls; see discussion at
-// http://www.azillionmonkeys.com/qed/random.html
-
-// rand() is poorly implemented (e.g. in VC7) and only returns < 16 bits;
-// double that amount by concatenating 2 random numbers.
-// this is not to fix poor rand() randomness - the number returned will be
-// folded down to a much smaller interval anyway. instead, a larger XRAND_MAX
-// decreases the probability of having to repeat the loop.
-#if RAND_MAX < 65536
-static const uint XRAND_MAX = (RAND_MAX+1)*(RAND_MAX+1) - 1;
-static uint xrand()
-{
-	return rand()*(RAND_MAX+1) + rand();
-}
-// rand() is already ok; no need to do anything.
-#else
-static const uint XRAND_MAX = RAND_MAX;
-static uint xrand()
-{
-	return rand();
-}
-#endif
-
-uint rand(uint min_inclusive, uint max_exclusive)
-{
-	const uint range = (max_exclusive-min_inclusive);
-	// huge interval or min >= max
-	if(range == 0 || range > XRAND_MAX)
-	{
-		WARN_ERR(ERR::INVALID_PARAM);
-		return 0;
-	}
-
-	const uint inv_range = XRAND_MAX / range;
-
-	// generate random number in [0, range)
-	// idea: avoid skewed distributions when <range> doesn't evenly divide
-	// XRAND_MAX by simply discarding values in the "remainder".
-	// not expected to run often since XRAND_MAX is large.
-	uint x;
-	do
-		x = xrand();
-	while(x >= range * inv_range);
-	x /= inv_range;
-
-	x += min_inclusive;
-	debug_assert(x < max_exclusive);
-	return x;
-}
-
 
 //-----------------------------------------------------------------------------
 // type conversion
diff --git a/source/lib/lib.h b/source/lib/lib.h
index 69970adda2..b58a9b5e8f 100644
--- a/source/lib/lib.h
+++ b/source/lib/lib.h
@@ -207,14 +207,6 @@ inline bool feqf(float f1, float f2, float epsilon = 0.001f)
 }
 
 
-/**
- * return random integer in [min, max).
- * avoids several common pitfalls; see discussion at
- * http://www.azillionmonkeys.com/qed/random.html
- **/
-extern uint rand(uint min_inclusive, uint max_exclusive);
-
-
 //-----------------------------------------------------------------------------
 // type conversion
 
diff --git a/source/lib/rand.cpp b/source/lib/rand.cpp
new file mode 100644
index 0000000000..57cd37c065
--- /dev/null
+++ b/source/lib/rand.cpp
@@ -0,0 +1,62 @@
+/**
+ * =========================================================================
+ * File        : rand.cpp
+ * Project     : 0 A.D.
+ * Description : pseudorandom number generator
+ * =========================================================================
+ */
+
+// license: GPL; see lib/license.txt
+
+#include "precompiled.h"
+#include "rand.h"
+
+// avoids several common pitfalls; see discussion at
+// http://www.azillionmonkeys.com/qed/random.html
+
+// rand() is poorly implemented (e.g. in VC7) and only returns < 16 bits;
+// double that amount by concatenating 2 random numbers.
+// this is not to fix poor rand() randomness - the number returned will be
+// folded down to a much smaller interval anyway. instead, a larger XRAND_MAX
+// decreases the probability of having to repeat the loop.
+#if RAND_MAX < 65536
+static const uint XRAND_MAX = (RAND_MAX+1)*(RAND_MAX+1) - 1;
+static uint xrand()
+{
+	return rand()*(RAND_MAX+1) + rand();
+}
+// rand() is already ok; no need to do anything.
+#else
+static const uint XRAND_MAX = RAND_MAX;
+static uint xrand()
+{
+	return rand();
+}
+#endif
+
+uint rand(uint min_inclusive, uint max_exclusive)
+{
+	const uint range = (max_exclusive-min_inclusive);
+	// huge interval or min >= max
+	if(range == 0 || range > XRAND_MAX)
+	{
+		WARN_ERR(ERR::INVALID_PARAM);
+		return 0;
+	}
+
+	const uint inv_range = XRAND_MAX / range;
+
+	// generate random number in [0, range)
+	// idea: avoid skewed distributions when <range> doesn't evenly divide
+	// XRAND_MAX by simply discarding values in the "remainder".
+	// not expected to run often since XRAND_MAX is large.
+	uint x;
+	do
+	x = xrand();
+	while(x >= range * inv_range);
+	x /= inv_range;
+
+	x += min_inclusive;
+	debug_assert(x < max_exclusive);
+	return x;
+}
diff --git a/source/lib/rand.h b/source/lib/rand.h
new file mode 100644
index 0000000000..3d3d9e248e
--- /dev/null
+++ b/source/lib/rand.h
@@ -0,0 +1,21 @@
+/**
+ * =========================================================================
+ * File        : rand.h
+ * Project     : 0 A.D.
+ * Description : pseudorandom number generator
+ * =========================================================================
+ */
+
+// license: GPL; see lib/license.txt
+
+#ifndef INCLUDED_RAND
+#define INCLUDED_RAND
+
+/**
+ * return random integer in [min, max).
+ * avoids several common pitfalls; see discussion at
+ * http://www.azillionmonkeys.com/qed/random.html
+ **/
+extern uint rand(uint min_inclusive, uint max_exclusive);
+
+#endif	// #ifndef INCLUDED_RAND
diff --git a/source/lib/res/file/path.cpp b/source/lib/res/file/path.cpp
index 5980f5e722..388190b94e 100644
--- a/source/lib/res/file/path.cpp
+++ b/source/lib/res/file/path.cpp
@@ -15,6 +15,7 @@
 
 #include "lib/posix/posix_filesystem.h"
 #include "lib/adts.h"
+#include "lib/rand.h"
 #include "lib/allocators.h"
 #include "lib/sysdep/sysdep.h"
 #include "file_internal.h"
diff --git a/source/lib/res/file/tests/test_archive_builder.h b/source/lib/res/file/tests/test_archive_builder.h
index 23fddb010e..e95ccb4144 100644
--- a/source/lib/res/file/tests/test_archive_builder.h
+++ b/source/lib/res/file/tests/test_archive_builder.h
@@ -9,6 +9,7 @@
 #include "lib/res/file/archive_builder.h"
 #include "lib/res/h_mgr.h"
 #include "lib/res/mem.h"
+#include "lib/rand.h"
 
 class TestArchiveBuilder : public CxxTest::TestSuite 
 {
diff --git a/source/lib/res/file/tests/test_file_cache.h b/source/lib/res/file/tests/test_file_cache.h
index 1ca476541d..4ad849b5a3 100644
--- a/source/lib/res/file/tests/test_file_cache.h
+++ b/source/lib/res/file/tests/test_file_cache.h
@@ -1,6 +1,7 @@
 #include "lib/self_test.h"
 
 #include "lib/res/file/file_cache.h"
+#include "lib/rand.h"
 
 class TestFileCache : public CxxTest::TestSuite 
 {
diff --git a/source/lib/res/sound/snd_mgr.cpp b/source/lib/res/sound/snd_mgr.cpp
index 588b7120bd..d6f7eaf168 100644
--- a/source/lib/res/sound/snd_mgr.cpp
+++ b/source/lib/res/sound/snd_mgr.cpp
@@ -19,15 +19,7 @@
 #include <deque>
 #include <math.h>
 
-#include "maths/MathUtil.h"
-
-#ifdef __APPLE__
-# include <OpenAL/al.h>
-# include <OpenAL/alc.h>
-#else
-# include <AL/al.h>
-# include <AL/alc.h>
-#endif
+#include "maths/MathUtil.h"	// PI
 
 // for DLL-load hack in alc_init
 #if OS_WIN
@@ -37,15 +29,11 @@
 #include "lib/res/res.h"
 #include "lib/timer.h"
 #include "lib/app_hooks.h"
+#include "lib/external_libraries/openal.h"
 
 #define OGG_HACK
 #include "ogghack.h"
 
-
-#if MSC_VERSION
-# pragma comment(lib, "openal32.lib")
-#endif
-
 // HACK: OpenAL loads and unloads certain DLLs several times on Windows.
 // that looks unnecessary and wastes 100..400 ms on startup.
 // we hold a reference to prevent the actual unload. everything works ATM;
diff --git a/source/lib/sysdep/cpu.cpp b/source/lib/sysdep/cpu.cpp
index c41faefc3e..8722c88b84 100644
--- a/source/lib/sysdep/cpu.cpp
+++ b/source/lib/sysdep/cpu.cpp
@@ -17,7 +17,7 @@
 # include "lib/sysdep/ia32/ia32.h"
 # include "lib/sysdep/ia32/ia32_memcpy.h"
 #endif
-#if OS_BSD || OS_MACOSX
+#if OS_BSD
 # include "lib/sysdep/unix/bsd.h"
 #endif
 #if OS_WIN
diff --git a/source/lib/sysdep/unix/bsd.cpp b/source/lib/sysdep/unix/bsd.cpp
index b0dc01e854..8ae1b97e18 100644
--- a/source/lib/sysdep/unix/bsd.cpp
+++ b/source/lib/sysdep/unix/bsd.cpp
@@ -1,7 +1,7 @@
 #include "precompiled.h"
 #include "bsd.h"
 
-#if OS_BSD || OS_MACOSX
+#if OS_BSD
 
 #include <sys/sysctl.h>
 
diff --git a/source/lib/tests/test_adts.h b/source/lib/tests/test_adts.h
index 74ba8d7e09..b76d696359 100644
--- a/source/lib/tests/test_adts.h
+++ b/source/lib/tests/test_adts.h
@@ -1,6 +1,7 @@
 #include "lib/self_test.h"
 
 #include "lib/adts.h"
+#include "lib/rand.h"
 
 class TestRingbuf : public CxxTest::TestSuite 
 {
diff --git a/source/lib/tests/test_cache_adt.h b/source/lib/tests/test_cache_adt.h
index d4365a4f42..4f1c179bba 100644
--- a/source/lib/tests/test_cache_adt.h
+++ b/source/lib/tests/test_cache_adt.h
@@ -1,6 +1,7 @@
 #include "lib/self_test.h"
 
 #include "lib/cache_adt.h"
+#include "lib/rand.h"
 
 class TestCache: public CxxTest::TestSuite 
 {
diff --git a/source/lib/tests/test_lib.h b/source/lib/tests/test_lib.h
index 066486a128..1bce91ce41 100644
--- a/source/lib/tests/test_lib.h
+++ b/source/lib/tests/test_lib.h
@@ -43,33 +43,4 @@ public:
 	}
 
 	// fp_to_u?? already validate the result.
-
-	void test_rand()
-	{
-		// complain if huge interval or min > max
-		debug_skip_next_err(ERR::INVALID_PARAM);
-		TS_ASSERT_EQUALS(rand(1, 0), 0);
-		debug_skip_next_err(ERR::INVALID_PARAM);
-		TS_ASSERT_EQUALS(rand(2, ~0u), 0);
-
-		// returned number must be in [min, max)
-		for(int i = 0; i < 100; i++)
-		{
-			uint min = rand(), max = min+rand();
-			uint x = rand(min, max);
-			TS_ASSERT(min <= x && x < max);
-		}
-
-		// make sure both possible values are hit
-		uint ones = 0, twos = 0;
-		for(int i = 0; i < 100; i++)
-		{
-			uint x = rand(1, 3);
-			// paranoia: don't use array (x might not be 1 or 2 - checked below)
-			if(x == 1) ones++;
-			if(x == 2) twos++;
-		}
-		TS_ASSERT_EQUALS(ones+twos, 100);
-		TS_ASSERT(ones > 10 && twos > 10);
-	}
 };
diff --git a/source/lib/tests/test_lockfree.h b/source/lib/tests/test_lockfree.h
index b2d3c0e459..2b63575715 100644
--- a/source/lib/tests/test_lockfree.h
+++ b/source/lib/tests/test_lockfree.h
@@ -3,6 +3,7 @@
 #include "lib/lockfree.h"
 #include "lib/sysdep/cpu.h"	// atomic_add
 #include "lib/timer.h"
+#include "lib/rand.h"
 
 // make sure the data structures work at all; doesn't test thread-safety.
 class TestLockfreeBasic : public CxxTest::TestSuite 
diff --git a/source/lib/tests/test_rand.h b/source/lib/tests/test_rand.h
new file mode 100644
index 0000000000..a0c635f755
--- /dev/null
+++ b/source/lib/tests/test_rand.h
@@ -0,0 +1,42 @@
+#include "lib/self_test.h"
+
+#include "lib/rand.h"
+
+class TestRand : public CxxTest::TestSuite 
+{
+public:
+	// complain if huge interval or min > max
+	void TestParam()
+	{
+		debug_skip_next_err(ERR::INVALID_PARAM);
+		TS_ASSERT_EQUALS(rand(1, 0), 0);
+		debug_skip_next_err(ERR::INVALID_PARAM);
+		TS_ASSERT_EQUALS(rand(2, ~0u), 0);
+	}
+
+	// returned number must be in [min, max)
+	void TestReturnedRange()
+	{
+		for(int i = 0; i < 100; i++)
+		{
+			uint min = rand(), max = min+rand();
+			uint x = rand(min, max);
+			TS_ASSERT(min <= x && x < max);
+		}
+	}
+
+	// make sure both possible values are hit
+	void TestTwoValues()
+	{
+		uint ones = 0, twos = 0;
+		for(int i = 0; i < 100; i++)
+		{
+			uint x = rand(1, 3);
+			// paranoia: don't use array (x might not be 1 or 2 - checked below)
+			if(x == 1) ones++;
+			if(x == 2) twos++;
+		}
+		TS_ASSERT_EQUALS(ones+twos, 100);
+		TS_ASSERT(ones > 10 && twos > 10);
+	}
+};
diff --git a/source/simulation/EntityStateProcessing.cpp b/source/simulation/EntityStateProcessing.cpp
index bb422ecb3c..5e71d4f169 100644
--- a/source/simulation/EntityStateProcessing.cpp
+++ b/source/simulation/EntityStateProcessing.cpp
@@ -21,6 +21,8 @@
 #include "ps/Game.h"
 #include "ps/World.h"
 
+#include "lib/rand.h"
+
 enum EGotoSituation
 {
 	NORMAL = 0,
diff --git a/source/sound/SoundGroup.cpp b/source/sound/SoundGroup.cpp
index ee708b5151..3cbeeeb643 100644
--- a/source/sound/SoundGroup.cpp
+++ b/source/sound/SoundGroup.cpp
@@ -16,6 +16,7 @@
 
 #include "ps/XML/Xeromyces.h"
 #include "ps/CLogger.h"
+#include "lib/rand.h"
 
 #define LOG_CATEGORY "audio"