diff --git a/Makefile b/Makefile
index 0cf7a445..870fac6c 100644
--- a/Makefile
+++ b/Makefile
@@ -289,12 +289,12 @@ ifeq ($(PLATFORM),darwin)
   
   ifeq ($(BUILD_MACOSX_UB),ppc)
     CC=gcc-4.0
-    BASE_CFLAGS += -arch ppc -DSMP \
+    BASE_CFLAGS += -arch ppc -mmacosx-version-min=10.4 -DSMP \
       -DMAC_OS_X_VERSION_MIN_REQUIRED=1020 -nostdinc \
       -F"$(MACOSX_SDK_DIR)"/System/Library/Frameworks \
       -I"$(MACOSX_SDK_DIR)"/"$(MACOSX_SDK_INC)" \
       -isystem "$(MACOSX_SDK_DIR)"/usr/include
-    LDFLAGS += -arch ppc \
+    LDFLAGS += -arch ppc -mmacosx-version-min=10.4 \
       -L"$(MACOSX_SDK_DIR)"/"$(MACOSX_SDK_LIB)" \
       -F"$(MACOSX_SDK_DIR)"/System/Library/Frameworks \
       -Wl,-syslibroot,"$(MACOSX_SDK_DIR)"
@@ -309,7 +309,7 @@ ifeq ($(PLATFORM),darwin)
       -F"$(MACOSX_SDK_DIR)"/System/Library/Frameworks \
       -I"$(MACOSX_SDK_DIR)"/"$(MACOSX_SDK_INC)" \
       -isystem "$(MACOSX_SDK_DIR)"/usr/include
-    LDFLAGS = -arch i386 -mmacosx-version-min=10.4 \
+    LDFLAGS += -arch i386 -mmacosx-version-min=10.4 \
       -L"$(MACOSX_SDK_DIR)"/"$(MACOSX_SDK_LIB)" \
       -F"$(MACOSX_SDK_DIR)"/System/Library/Frameworks \
       -Wl,-syslibroot,"$(MACOSX_SDK_DIR)"
diff --git a/make-macosx-ub.sh b/make-macosx-ub.sh
index 44485cd5..f580f0f6 100755
--- a/make-macosx-ub.sh
+++ b/make-macosx-ub.sh
@@ -49,9 +49,9 @@ unset PPC_SDK_OPENAL_DLOPEN
 for availsdks in $(find /Developer/SDKs -type d -maxdepth 1 -mindepth 1 -name "MacOSX*" -exec basename {} \; | sort -r)
 do
 	case "$availsdks" in
-	'MacOSX10.5u.sdk')
-		PPC_SDK_DIR=/Developer/SDKs/MacOSX10.5u.sdk
-		X86_SDK_DIR=/Developer/SDKs/MacOSX10.5u.sdk
+	'MacOSX10.5.sdk')
+		PPC_SDK_DIR=/Developer/SDKs/MacOSX10.5.sdk
+		X86_SDK_DIR=/Developer/SDKs/MacOSX10.5.sdk
 		PPC_SDK_INC=usr/lib/gcc/powerpc-apple-darwin9/4.0.1/include
 		X86_SDK_INC=usr/lib/gcc/i686-apple-darwin9/4.0.1/include
 		PPC_SDK_LIB=usr/lib/gcc/powerpc-apple-darwin9/4.0.1
@@ -61,10 +61,10 @@ do
 	'MacOSX10.4u.sdk')
 		PPC_SDK_DIR=/Developer/SDKs/MacOSX10.4u.sdk
 		X86_SDK_DIR=/Developer/SDKs/MacOSX10.4u.sdk
-		PPC_SDK_INC=usr/lib/gcc/powerpc-apple-darwin8/4.0.1/include
-		X86_SDK_INC=usr/lib/gcc/i686-apple-darwin8/4.0.1/include
-		PPC_SDK_LIB=usr/lib/gcc/powerpc-apple-darwin8/4.0.1
-		X86_SDK_LIB=usr/lib/gcc/i686-apple-darwin8/4.0.1
+		PPC_SDK_INC=usr/lib/gcc/powerpc-apple-darwin9/4.0.1/include
+		X86_SDK_INC=usr/lib/gcc/i686-apple-darwin9/4.0.1/include
+		PPC_SDK_LIB=usr/lib/gcc/powerpc-apple-darwin9/4.0.1
+		X86_SDK_LIB=usr/lib/gcc/i686-apple-darwin9/4.0.1
 		PPC_SDK_OPENAL_DLOPEN=0
 	;;
 	'MacOSX10.3.9.sdk')