diff --git a/samples/example_app/MakeMacExample.sh b/samples/example_app/MakeMacExample.sh
index f93483ecc3..fb1ba990df 100644
--- a/samples/example_app/MakeMacExample.sh
+++ b/samples/example_app/MakeMacExample.sh
@@ -59,8 +59,8 @@ echo "***************************************************"
 echo
 
 export CC=/usr/bin/gcc-4.0;export CXX=/usr/bin/g++-4.0
-export LDFLAGS="-Wl,-arch,ppc"
-export VARIANTFLAGS="-arch ppc -fvisibility=hidden -fvisibility-inlines-hidden"
+export LDFLAGS="-Wl,-syslibroot,/Developer/SDKs/MacOSX10.4u.sdk,-arch,ppc"
+export VARIANTFLAGS="-isysroot /Developer/SDKs/MacOSX10.4u.sdk -arch ppc -fvisibility=hidden -fvisibility-inlines-hidden"
 if [ "$HAS_1039SDK" = "1" ]; then
 export MACOSX_DEPLOYMENT_TARGET=10.3
 else
@@ -87,8 +87,8 @@ echo
 
 export MACOSX_DEPLOYMENT_TARGET=10.4
 export CC=/usr/bin/gcc-4.0;export CXX=/usr/bin/g++-4.0
-export LDFLAGS="-Wl,-arch,i386"
-export VARIANTFLAGS="-arch i386 -fvisibility=hidden -fvisibility-inlines-hidden"
+export LDFLAGS="-Wl,-syslibroot,/Developer/SDKs/MacOSX10.4u.sdk,-arch,i386"
+export VARIANTFLAGS="-isysroot /Developer/SDKs/MacOSX10.4u.sdk -arch i386 -fvisibility=hidden -fvisibility-inlines-hidden"
 
 rm -f uc2.o
 rm -f uc2_graphics.o
@@ -110,8 +110,8 @@ echo
 
 export MACOSX_DEPLOYMENT_TARGET=10.5
 export CC=/usr/bin/gcc-4.0;export CXX=/usr/bin/g++-4.0
-export LDFLAGS="-Wl,-arch,x86_64"
-export VARIANTFLAGS="-arch x86_64 -fvisibility=hidden -fvisibility-inlines-hidden"
+export LDFLAGS="-Wl,-syslibroot,/Developer/SDKs/MacOSX10.5.sdk,-arch,x86_64"
+export VARIANTFLAGS="-isysroot /Developer/SDKs/MacOSX10.5.sdk -arch x86_64 -fvisibility=hidden -fvisibility-inlines-hidden"
 
 rm -f uc2.o
 rm -f uc2_graphics.o
diff --git a/samples/example_app/Makefile_mac2 b/samples/example_app/Makefile_mac2
index 11cbcc47e2..f672deabf6 100644
--- a/samples/example_app/Makefile_mac2
+++ b/samples/example_app/Makefile_mac2
@@ -22,21 +22,24 @@ CXXFLAGS_ALL = \
 CC_PPC = /usr/bin/gcc-4.0
 CXX_PPC = /usr/bin/g++-4.0
 CXXFLAGS_PPC = -arch ppc -mmacosx-version-min=10.4 \
-    $(CXXFLAGS_ALL)  -fvisibility=hidden -fvisibility-inlines-hidden
-LDFLAGS_PPC = -Wl,-arch,ppc
+    -isysroot /Developer/SDKs/MacOSX10.4u.sdk \
+    $(CXXFLAGS_ALL) -fvisibility=hidden -fvisibility-inlines-hidden
+LDFLAGS_PPC = -Wl,-syslibroot,/Developer/SDKs/MacOSX10.4u.sdk,-arch,ppc
 
 
 CC_i386 = /usr/bin/gcc-4.0
 CXX_i386 = /usr/bin/g++-4.0
 CXXFLAGS_i386 = -arch i386 -mmacosx-version-min=10.4  \
-    $(CXXFLAGS_ALL)  -fvisibility=hidden -fvisibility-inlines-hidden
-LDFLAGS_i386 = -Wl,-arch,i386
+    -isysroot /Developer/SDKs/MacOSX10.4u.sdk \
+    $(CXXFLAGS_ALL) -fvisibility=hidden -fvisibility-inlines-hidden
+LDFLAGS_i386 = -Wl,-syslibroot,/Developer/SDKs/MacOSX10.4u.sdk,-arch,i386
 
 CC_x86_64 = /usr/bin/gcc-4.0
 CXX_x86_64 = /usr/bin/g++-4.0
 CXXFLAGS_x86_64 = -arch x86_64 -mmacosx-version-min=10.5 \
-    $(CXXFLAGS_ALL)  -fvisibility=hidden -fvisibility-inlines-hidden
-LDFLAGS_x86_64 = -Wl,-arch,x86_64
+    -isysroot /Developer/SDKs/MacOSX10.5.sdk \
+    $(CXXFLAGS_ALL) -fvisibility=hidden -fvisibility-inlines-hidden
+LDFLAGS_x86_64 = -Wl,-syslibroot,/Developer/SDKs/MacOSX10.5.sdk,-arch,x86_64
 
 
 LIBJPEG = ../../../jpeg-6b/libjpeg.a