diff --git a/progs/SConscript b/progs/SConscript
index 71ebe5e0f37..620dd30e69c 100644
--- a/progs/SConscript
+++ b/progs/SConscript
@@ -1,6 +1,7 @@
 SConscript([
     'util/SConscript',
     'demos/SConscript',
+    'glsl/SConscript',
     'redbook/SConscript',
     'samples/SConscript',
     'tests/SConscript',
diff --git a/progs/glsl/SConscript b/progs/glsl/SConscript
new file mode 100644
index 00000000000..7a4549cd705
--- /dev/null
+++ b/progs/glsl/SConscript
@@ -0,0 +1,55 @@
+Import('*')
+
+if not env['GLUT']:
+    Return()
+
+env = env.Clone()
+
+env.Prepend(CPPPATH = [
+	'../util',
+])
+
+env.Prepend(LIBS = [
+	util,
+	'$GLUT_LIB'
+])
+
+if env['platform'] == 'windows':
+    env.Append(CPPDEFINES = ['NOMINMAX'])
+    env.Prepend(LIBS = ['winmm'])
+
+progs = [
+      'array',
+      'bitmap',
+      'brick',
+      'bump',
+      'convolutions',
+      'deriv',
+      'fragcoord',
+      'identity',
+      'linktest',
+      'mandelbrot',
+      'multinoise',
+      'multitex',
+      'noise',
+      'noise2',
+      'pointcoord',
+      'points',
+      'samplers',
+      'shadow_sampler',
+      'skinning',
+      'texaaline',
+      'texdemo1',
+      'toyball',
+      'trirast',
+      'twoside',
+      'vert-or-frag-only',
+      'vert-tex',
+]
+
+for prog in progs:
+    env.Program(
+        target = prog,
+        source = prog + '.c',
+    )
+    
diff --git a/progs/glsl/array.c b/progs/glsl/array.c
index 46ef8043bcf..6da15b2fcc0 100644
--- a/progs/glsl/array.c
+++ b/progs/glsl/array.c
@@ -9,9 +9,9 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <math.h>
+#include <GL/glew.h>
 #include <GL/gl.h>
 #include <GL/glut.h>
-#include <GL/glext.h>
 #include "extfuncs.h"
 #include "shaderutil.h"
 
@@ -248,6 +248,7 @@ main(int argc, char *argv[])
    glutInitWindowSize(500, 500);
    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);
    win = glutCreateWindow(argv[0]);
+   glewInit();
    glutReshapeFunc(Reshape);
    glutKeyboardFunc(Key);
    glutSpecialFunc(SpecialKey);
diff --git a/progs/glsl/bitmap.c b/progs/glsl/bitmap.c
index d488ec6cb9f..08fac15c89d 100644
--- a/progs/glsl/bitmap.c
+++ b/progs/glsl/bitmap.c
@@ -9,6 +9,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <math.h>
+#include <GL/glew.h>
 #include <GL/gl.h>
 #include <GL/glut.h>
 #include <GL/glext.h>
@@ -309,6 +310,7 @@ main(int argc, char *argv[])
    glutInitWindowSize(WinWidth, WinHeight);
    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);
    Win = glutCreateWindow(argv[0]);
+   glewInit();
    glutReshapeFunc(Reshape);
    glutKeyboardFunc(Key);
    glutSpecialFunc(SpecialKey);
diff --git a/progs/glsl/brick.c b/progs/glsl/brick.c
index 526ef0e2e36..607acd05977 100644
--- a/progs/glsl/brick.c
+++ b/progs/glsl/brick.c
@@ -9,6 +9,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <math.h>
+#include <GL/glew.h>
 #include <GL/gl.h>
 #include <GL/glut.h>
 #include <GL/glext.h>
@@ -191,6 +192,7 @@ main(int argc, char *argv[])
    glutInitWindowSize(400, 400);
    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);
    win = glutCreateWindow(argv[0]);
+   glewInit();
    glutReshapeFunc(Reshape);
    glutKeyboardFunc(Key);
    glutSpecialFunc(SpecialKey);
diff --git a/progs/glsl/bump.c b/progs/glsl/bump.c
index 0ea1f8331ff..c401e590f74 100644
--- a/progs/glsl/bump.c
+++ b/progs/glsl/bump.c
@@ -288,6 +288,7 @@ main(int argc, char *argv[])
    glutInitWindowSize(400, 400);
    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);
    win = glutCreateWindow(argv[0]);
+   glewInit();
    glutReshapeFunc(Reshape);
    glutKeyboardFunc(Key);
    glutSpecialFunc(SpecialKey);
diff --git a/progs/glsl/convolutions.c b/progs/glsl/convolutions.c
index ac71c68235e..22ce7edcdc5 100644
--- a/progs/glsl/convolutions.c
+++ b/progs/glsl/convolutions.c
@@ -5,6 +5,8 @@
  * Author: Zack Rusin
  */
 
+#include <GL/glew.h>
+
 #define GL_GLEXT_PROTOTYPES
 #include "readtex.h"
 
@@ -455,6 +457,7 @@ int main(int argc, char **argv)
       exit(1);
    }
 
+   glewInit();
    init();
 
    glutReshapeFunc(reshape);
diff --git a/progs/glsl/deriv.c b/progs/glsl/deriv.c
index e69f0b82c45..3fd674c3310 100644
--- a/progs/glsl/deriv.c
+++ b/progs/glsl/deriv.c
@@ -13,6 +13,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <math.h>
+#include <GL/glew.h>
 #include <GL/gl.h>
 #include <GL/glut.h>
 #include <GL/glext.h>
@@ -228,6 +229,7 @@ main(int argc, char *argv[])
    glutInitWindowSize(200, 200);
    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);
    win = glutCreateWindow(argv[0]);
+   glewInit();
    glutReshapeFunc(Reshape);
    glutKeyboardFunc(Key);
    glutSpecialFunc(SpecialKey);
diff --git a/progs/glsl/fragcoord.c b/progs/glsl/fragcoord.c
index 0b7561f3e47..509ad47e7f6 100644
--- a/progs/glsl/fragcoord.c
+++ b/progs/glsl/fragcoord.c
@@ -12,6 +12,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <math.h>
+#include <GL/glew.h>
 #include <GL/gl.h>
 #include <GL/glut.h>
 #include <GL/glext.h>
@@ -174,6 +175,7 @@ main(int argc, char *argv[])
    glutInitWindowSize(WinWidth, WinHeight);
    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE);
    win = glutCreateWindow(argv[0]);
+   glewInit();
    glutReshapeFunc(Reshape);
    glutKeyboardFunc(Key);
    glutDisplayFunc(Redisplay);
diff --git a/progs/glsl/identity.c b/progs/glsl/identity.c
index 37579eb3469..5ba7468cc44 100644
--- a/progs/glsl/identity.c
+++ b/progs/glsl/identity.c
@@ -9,6 +9,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <math.h>
+#include <GL/glew.h>
 #include <GL/gl.h>
 #include <GL/glut.h>
 #include <GL/glext.h>
@@ -195,6 +196,7 @@ main(int argc, char *argv[])
    glutInitWindowSize(200, 200);
    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);
    win = glutCreateWindow(argv[0]);
+   glewInit();
    glutReshapeFunc(Reshape);
    glutKeyboardFunc(Key);
    glutSpecialFunc(SpecialKey);
diff --git a/progs/glsl/linktest.c b/progs/glsl/linktest.c
index 988d0823418..fe5d1564e07 100644
--- a/progs/glsl/linktest.c
+++ b/progs/glsl/linktest.c
@@ -9,6 +9,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <math.h>
+#include <GL/glew.h>
 #include <GL/gl.h>
 #include <GL/glut.h>
 #include <GL/glext.h>
@@ -245,6 +246,7 @@ main(int argc, char *argv[])
    glutInitWindowSize(300, 300);
    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);
    Win = glutCreateWindow(argv[0]);
+   glewInit();
    glutReshapeFunc(Reshape);
    glutKeyboardFunc(Key);
    glutDisplayFunc(Redisplay);
diff --git a/progs/glsl/mandelbrot.c b/progs/glsl/mandelbrot.c
index 24e19926655..eeea4eb52ae 100644
--- a/progs/glsl/mandelbrot.c
+++ b/progs/glsl/mandelbrot.c
@@ -9,6 +9,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <math.h>
+#include <GL/glew.h>
 #include <GL/gl.h>
 #include <GL/glut.h>
 #include <GL/glext.h>
@@ -206,6 +207,7 @@ main(int argc, char *argv[])
    glutInitWindowSize(400, 400);
    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);
    win = glutCreateWindow(argv[0]);
+   glewInit();
    glutReshapeFunc(Reshape);
    glutKeyboardFunc(Key);
    glutSpecialFunc(SpecialKey);
diff --git a/progs/glsl/multinoise.c b/progs/glsl/multinoise.c
index 2351863aff8..400511508e1 100644
--- a/progs/glsl/multinoise.c
+++ b/progs/glsl/multinoise.c
@@ -8,6 +8,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <math.h>
+#include <GL/glew.h>
 #include <GL/gl.h>
 #include <GL/glut.h>
 #include <GL/glext.h>
@@ -270,6 +271,7 @@ main(int argc, char *argv[])
    glutInitWindowSize(400, 400);
    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);
    win = glutCreateWindow(argv[0]);
+   glewInit();
    glutReshapeFunc(Reshape);
    glutKeyboardFunc(Key);
    glutSpecialFunc(SpecialKey);
diff --git a/progs/glsl/multitex.c b/progs/glsl/multitex.c
index 1a1c63aaf48..cbf173304c1 100644
--- a/progs/glsl/multitex.c
+++ b/progs/glsl/multitex.c
@@ -28,6 +28,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <GL/glew.h>
 #include "GL/glut.h"
 #include "readtex.h"
 #include "extfuncs.h"
@@ -400,6 +401,7 @@ main(int argc, char *argv[])
    glutInitWindowSize(500, 400);
    glutInitDisplayMode(GLUT_RGB | GLUT_DEPTH | GLUT_DOUBLE);
    glutCreateWindow(Demo);
+   glewInit();
    glutReshapeFunc(Reshape);
    glutKeyboardFunc(key);
    glutSpecialFunc(specialkey);
diff --git a/progs/glsl/noise.c b/progs/glsl/noise.c
index bd8f50036bf..83e4696fc99 100644
--- a/progs/glsl/noise.c
+++ b/progs/glsl/noise.c
@@ -8,6 +8,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <math.h>
+#include <GL/glew.h>
 #include <GL/gl.h>
 #include <GL/glut.h>
 #include <GL/glext.h>
@@ -207,6 +208,7 @@ main(int argc, char *argv[])
    glutInitWindowSize(400, 400);
    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);
    win = glutCreateWindow(argv[0]);
+   glewInit();
    glutReshapeFunc(Reshape);
    glutKeyboardFunc(Key);
    glutSpecialFunc(SpecialKey);
diff --git a/progs/glsl/pointcoord.c b/progs/glsl/pointcoord.c
index b240077c252..aa01e2166d7 100644
--- a/progs/glsl/pointcoord.c
+++ b/progs/glsl/pointcoord.c
@@ -10,6 +10,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <math.h>
+#include <GL/glew.h>
 #include <GL/gl.h>
 #include <GL/glut.h>
 #include <GL/glext.h>
@@ -195,6 +196,7 @@ main(int argc, char *argv[])
    glutInitWindowSize(WinWidth, WinHeight);
    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE);
    win = glutCreateWindow(argv[0]);
+   glewInit();
    glutReshapeFunc(Reshape);
    glutKeyboardFunc(Key);
    glutDisplayFunc(Redisplay);
diff --git a/progs/glsl/points.c b/progs/glsl/points.c
index 392dc4db853..1b346228aa1 100644
--- a/progs/glsl/points.c
+++ b/progs/glsl/points.c
@@ -10,6 +10,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <math.h>
+#include <GL/glew.h>
 #include <GL/gl.h>
 #include <GL/glut.h>
 #include <GL/glext.h>
@@ -248,6 +249,7 @@ main(int argc, char *argv[])
    glutInitWindowSize(WinWidth, WinHeight);
    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);
    Win = glutCreateWindow(argv[0]);
+   glewInit();
    glutReshapeFunc(Reshape);
    glutKeyboardFunc(Key);
    glutSpecialFunc(SpecialKey);
diff --git a/progs/glsl/samplers.c b/progs/glsl/samplers.c
index 3fb8577d5e3..cbb264dad17 100644
--- a/progs/glsl/samplers.c
+++ b/progs/glsl/samplers.c
@@ -39,6 +39,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <GL/glew.h>
 #include "GL/glut.h"
 #include "readtex.h"
 #include "extfuncs.h"
@@ -357,6 +358,7 @@ main(int argc, char *argv[])
    glutInitWindowSize(500, 400);
    glutInitDisplayMode(GLUT_RGB | GLUT_DEPTH | GLUT_DOUBLE);
    glutCreateWindow(Demo);
+   glewInit();
    glutReshapeFunc(Reshape);
    glutKeyboardFunc(key);
    glutSpecialFunc(specialkey);
diff --git a/progs/glsl/shadow_sampler.c b/progs/glsl/shadow_sampler.c
index 2902b535522..673ad465ad8 100644
--- a/progs/glsl/shadow_sampler.c
+++ b/progs/glsl/shadow_sampler.c
@@ -10,6 +10,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <math.h>
+#include <GL/glew.h>
 #include <GL/gl.h>
 #include <GL/glut.h>
 #include <GL/glext.h>
@@ -329,6 +330,7 @@ main(int argc, char *argv[])
    glutInitWindowSize(400, 300);
    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE);
    win = glutCreateWindow(argv[0]);
+   glewInit();
    glutReshapeFunc(Reshape);
    glutKeyboardFunc(Key);
    glutDisplayFunc(Redisplay);
diff --git a/progs/glsl/skinning.c b/progs/glsl/skinning.c
index 8a65d0667ce..d7b968fed05 100644
--- a/progs/glsl/skinning.c
+++ b/progs/glsl/skinning.c
@@ -12,6 +12,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <math.h>
+#include <GL/glew.h>
 #include <GL/gl.h>
 #include <GL/glut.h>
 #include <GL/glext.h>
@@ -266,6 +267,7 @@ main(int argc, char *argv[])
    glutInitWindowSize(500, 500);
    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);
    win = glutCreateWindow(argv[0]);
+   glewInit();
    glutReshapeFunc(Reshape);
    glutKeyboardFunc(Key);
    glutSpecialFunc(SpecialKey);
diff --git a/progs/glsl/texaaline.c b/progs/glsl/texaaline.c
index 0b3cc849586..6720941a6e1 100644
--- a/progs/glsl/texaaline.c
+++ b/progs/glsl/texaaline.c
@@ -11,6 +11,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <math.h>
+#include <GL/glew.h>
 #include <GL/gl.h>
 #include <GL/glut.h>
 #include <GL/glext.h>
@@ -359,6 +360,7 @@ main(int argc, char *argv[])
    glutInitWindowSize(WinWidth, WinHeight);
    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE);
    win = glutCreateWindow(argv[0]);
+   glewInit();
    glutReshapeFunc(Reshape);
    glutKeyboardFunc(Key);
    glutDisplayFunc(Redisplay);
diff --git a/progs/glsl/texdemo1.c b/progs/glsl/texdemo1.c
index 96ddca1f32d..08a87a51525 100644
--- a/progs/glsl/texdemo1.c
+++ b/progs/glsl/texdemo1.c
@@ -28,6 +28,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <GL/glew.h>
 #include "GL/glut.h"
 #include "readtex.h"
 #include "extfuncs.h"
@@ -426,6 +427,7 @@ main(int argc, char *argv[])
    glutInitWindowSize(500, 400);
    glutInitDisplayMode(GLUT_RGB | GLUT_DEPTH | GLUT_DOUBLE);
    win = glutCreateWindow(Demo);
+   glewInit();
    glutReshapeFunc(Reshape);
    glutKeyboardFunc(key);
    glutSpecialFunc(specialkey);
diff --git a/progs/glsl/toyball.c b/progs/glsl/toyball.c
index 37ad6bf2914..2b644acb6d4 100644
--- a/progs/glsl/toyball.c
+++ b/progs/glsl/toyball.c
@@ -9,6 +9,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <math.h>
+#include <GL/glew.h>
 #include <GL/gl.h>
 #include <GL/glut.h>
 #include <GL/glext.h>
@@ -212,6 +213,7 @@ main(int argc, char *argv[])
    glutInitWindowSize(400, 400);
    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);
    win = glutCreateWindow(argv[0]);
+   glewInit();
    glutReshapeFunc(Reshape);
    glutKeyboardFunc(Key);
    glutSpecialFunc(SpecialKey);
diff --git a/progs/glsl/trirast.c b/progs/glsl/trirast.c
index 89df64fc718..3d4decaa2fb 100644
--- a/progs/glsl/trirast.c
+++ b/progs/glsl/trirast.c
@@ -15,6 +15,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <math.h>
+#include <GL/glew.h>
 #include <GL/gl.h>
 #include <GL/glut.h>
 #include <GL/glext.h>
@@ -247,6 +248,7 @@ main(int argc, char *argv[])
    glutInitWindowSize(WinWidth, WinHeight);
    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);
    win = glutCreateWindow(argv[0]);
+   glewInit();
    glutReshapeFunc(Reshape);
    glutKeyboardFunc(Key);
    glutDisplayFunc(Redisplay);
diff --git a/progs/glsl/twoside.c b/progs/glsl/twoside.c
index 06488bd1759..9ebc4ec3607 100644
--- a/progs/glsl/twoside.c
+++ b/progs/glsl/twoside.c
@@ -12,6 +12,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <math.h>
+#include <GL/glew.h>
 #include <GL/gl.h>
 #include <GL/glut.h>
 #include <GL/glext.h>
@@ -293,6 +294,7 @@ main(int argc, char *argv[])
    glutInitWindowSize(WinWidth, WinHeight);
    glutInitDisplayMode(GLUT_RGB | GLUT_DEPTH | GLUT_DOUBLE);
    win = glutCreateWindow(argv[0]);
+   glewInit();
    glutReshapeFunc(Reshape);
    glutKeyboardFunc(Key);
    glutDisplayFunc(Redisplay);
diff --git a/progs/glsl/vert-or-frag-only.c b/progs/glsl/vert-or-frag-only.c
index f6eedd8327c..8e1612aca46 100644
--- a/progs/glsl/vert-or-frag-only.c
+++ b/progs/glsl/vert-or-frag-only.c
@@ -11,6 +11,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <math.h>
+#include <GL/glew.h>
 #include <GL/gl.h>
 #include <GL/glut.h>
 #include <GL/glext.h>
@@ -181,6 +182,7 @@ main(int argc, char *argv[])
    glutInitWindowSize(400, 200);
    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);
    Win = glutCreateWindow(argv[0]);
+   glewInit();
    glutReshapeFunc(Reshape);
    glutKeyboardFunc(Key);
    glutDisplayFunc(Redisplay);
diff --git a/progs/glsl/vert-tex.c b/progs/glsl/vert-tex.c
index 9d00a610540..b74bf50679f 100644
--- a/progs/glsl/vert-tex.c
+++ b/progs/glsl/vert-tex.c
@@ -9,6 +9,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <math.h>
+#include <GL/glew.h>
 #include <GL/gl.h>
 #include <GL/glut.h>
 #include <GL/glext.h>
@@ -266,6 +267,7 @@ main(int argc, char *argv[])
    glutInitWindowSize(500, 500);
    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);
    win = glutCreateWindow(argv[0]);
+   glewInit();
    glutReshapeFunc(Reshape);
    glutKeyboardFunc(Key);
    glutSpecialFunc(SpecialKey);
diff --git a/scons/dxsdk.py b/scons/dxsdk.py
index a369e1da10c..de090e4f991 100644
--- a/scons/dxsdk.py
+++ b/scons/dxsdk.py
@@ -40,10 +40,11 @@ def get_dxsdk_root(env):
     except KeyError:
         return None
 
-def get_dxsdk_paths(env):
+def generate(env):
     dxsdk_root = get_dxsdk_root(env)
     if dxsdk_root is None:
-        raise SCons.Errors.InternalError, "DirectX SDK not found"
+        # DirectX SDK not found
+        return
 
     if env['machine'] in ('generic', 'x86'):
         target_cpu = 'x86'
@@ -57,9 +58,6 @@ def get_dxsdk_paths(env):
     env.Prepend(CPPPATH = [os.path.join(dxsdk_root, 'Include')])
     env.Prepend(LIBPATH = [os.path.join(dxsdk_root, 'Lib', target_cpu)])
 
-def generate(env):
-    get_dxsdk_paths(env)
-
 def exists(env):
     return get_dxsdk_root(env) is not None
 
diff --git a/scons/gallium.py b/scons/gallium.py
index aed813f0279..7be0a250040 100644
--- a/scons/gallium.py
+++ b/scons/gallium.py
@@ -325,8 +325,10 @@ def generate(env):
     if gcc:
         if debug:
             ccflags += ['-O0', '-g3']
-        elif env['toolchain'] == 'crossmingw':
-            ccflags += ['-O0', '-g3'] # mingw 4.2.1 optimizer is broken
+        elif env['CCVERSION'].startswith('4.2.'):
+            # gcc 4.2.x optimizer is broken
+            print "warning: gcc 4.2.x optimizer is broken -- disabling optimizations"
+            ccflags += ['-O0', '-g3']
         else:
             ccflags += ['-O3', '-g3']
         if env['profile']:
@@ -449,11 +451,15 @@ def generate(env):
 
     # Linker options
     linkflags = []
+    shlinkflags = []
     if gcc:
         if env['machine'] == 'x86':
             linkflags += ['-m32']
         if env['machine'] == 'x86_64':
             linkflags += ['-m64']
+        shlinkflags += [
+            '-Wl,-Bsymbolic',
+        ]
     if platform == 'windows' and msvc:
         # See also:
         # - http://msdn2.microsoft.com/en-us/library/y0zzbyt4.aspx
@@ -501,6 +507,7 @@ def generate(env):
             '/entry:_DllMainCRTStartup',
         ]
     env.Append(LINKFLAGS = linkflags)
+    env.Append(SHLINKFLAGS = shlinkflags)
 
     # Default libs
     env.Append(LIBS = [])