diff --git a/reaction/make-macosx.sh b/reaction/make-macosx.sh
new file mode 100644
index 00000000..c3ed5347
--- /dev/null
+++ b/reaction/make-macosx.sh
@@ -0,0 +1,130 @@
+#!/bin/sh
+APPBUNDLE=ioquake3.app
+BINARY=ioquake3.x86_64
+DEDBIN=ioq3ded.x86_64
+PKGINFO=APPLIOQ3
+ICNS=misc/quake3.icns
+DESTDIR=build/release-darwin-x86_64
+BASEDIR=baseq3
+MPACKDIR=missionpack
+RENDERDIR=build/release-darwin-x86_64
+
+BIN_OBJ="
+	build/release-darwin-x86_64/ioquake3.x86_64
+"
+BIN_DEDOBJ="
+	build/release-darwin-x86_64/ioq3ded.x86_64
+"
+BASE_OBJ="
+	build/release-darwin-x86_64/$BASEDIR/cgamex86_64.dylib
+	build/release-darwin-x86_64/$BASEDIR/uix86_64.dylib
+	build/release-darwin-x86_64/$BASEDIR/qagamex86_64.dylib
+"
+MPACK_OBJ="
+	build/release-darwin-x86_64/$MPACKDIR/cgamex86_64.dylib
+	build/release-darwin-x86_64/$MPACKDIR/uix86_64.dylib
+	build/release-darwin-x86_64/$MPACKDIR/qagamex86_64.dylib
+"
+
+RENDER_OBJ="
+	build/release-darwin-x86_64/renderer_opengl1_smp_x86_64.dylib
+	build/release-darwin-x86_64/renderer_opengl1_x86_64.dylib
+"
+
+cd `dirname $0`
+if [ ! -f Makefile ]; then
+	echo "This script must be run from the ioquake3 build directory"
+	exit 1
+fi
+
+Q3_VERSION=`grep '^VERSION=' Makefile | sed -e 's/.*=\(.*\)/\1/'`
+
+# We only care if we're >= 10.4, not if we're specifically Tiger.
+# "8" is the Darwin major kernel version.
+TIGERHOST=`uname -r |perl -w -p -e 's/\A(\d+)\..*\Z/$1/; $_ = (($_ >= 8) ? "1" : "0");'`
+
+# we want to use the oldest available SDK for max compatiblity
+unset X86_SDK
+unset X86_CFLAGS
+unset X86_LDFLAGS
+if [ -d /Developer/SDKs/MacOSX10.5.sdk ]; then
+	X86_SDK=/Developer/SDKs/MacOSX10.5.sdk
+	X86_CFLAGS="-arch x86_64 -isysroot /Developer/SDKs/MacOSX10.5.sdk \
+			-DMAC_OS_X_VERSION_MIN_REQUIRED=1050"
+	X86_LDFLAGS=" -mmacosx-version-min=10.5"
+fi
+
+
+echo "Building X86 Client/Dedicated Server against \"$X86_SDK\""
+sleep 3
+
+if [ ! -d $DESTDIR ]; then
+	mkdir -p $DESTDIR
+fi
+
+# For parallel make on multicore boxes...
+NCPU=`sysctl -n hw.ncpu`
+
+
+# intel client and server
+if [ -d build/release-darwin-x86_64 ]; then
+	rm -r build/release-darwin-x86_64
+fi
+(ARCH=x86_64 CFLAGS=$X86_CFLAGS LDFLAGS=$X86_LDFLAGS make -j$NCPU) || exit 1;
+
+echo "Creating .app bundle $DESTDIR/$APPBUNDLE"
+if [ ! -d $DESTDIR/$APPBUNDLE/Contents/MacOS/$BASEDIR ]; then
+	mkdir -p $DESTDIR/$APPBUNDLE/Contents/MacOS/$BASEDIR || exit 1;
+fi
+if [ ! -d $DESTDIR/$APPBUNDLE/Contents/MacOS/$MPACKDIR ]; then
+	mkdir -p $DESTDIR/$APPBUNDLE/Contents/MacOS/$MPACKDIR || exit 1;
+fi
+if [ ! -d $DESTDIR/$APPBUNDLE/Contents/Resources ]; then
+	mkdir -p $DESTDIR/$APPBUNDLE/Contents/Resources
+fi
+cp $ICNS $DESTDIR/$APPBUNDLE/Contents/Resources/ioquake3.icns || exit 1;
+echo $PKGINFO > $DESTDIR/$APPBUNDLE/Contents/PkgInfo
+echo "
+	<?xml version=\"1.0\" encoding=\"UTF-8\"?>
+	<!DOCTYPE plist
+		PUBLIC \"-//Apple Computer//DTD PLIST 1.0//EN\"
+		\"http://www.apple.com/DTDs/PropertyList-1.0.dtd\">
+	<plist version=\"1.0\">
+	<dict>
+		<key>CFBundleDevelopmentRegion</key>
+		<string>English</string>
+		<key>CFBundleExecutable</key>
+		<string>$BINARY</string>
+		<key>CFBundleGetInfoString</key>
+		<string>ioquake3 $Q3_VERSION</string>
+		<key>CFBundleIconFile</key>
+		<string>ioquake3.icns</string>
+		<key>CFBundleIdentifier</key>
+		<string>org.ioquake.ioquake3</string>
+		<key>CFBundleInfoDictionaryVersion</key>
+		<string>6.0</string>
+		<key>CFBundleName</key>
+		<string>ioquake3</string>
+		<key>CFBundlePackageType</key>
+		<string>APPL</string>
+		<key>CFBundleShortVersionString</key>
+		<string>$Q3_VERSION</string>
+		<key>CFBundleSignature</key>
+		<string>$PKGINFO</string>
+		<key>CFBundleVersion</key>
+		<string>$Q3_VERSION</string>
+		<key>NSExtensions</key>
+		<dict/>
+		<key>NSPrincipalClass</key>
+		<string>NSApplication</string>
+	</dict>
+	</plist>
+	" > $DESTDIR/$APPBUNDLE/Contents/Info.plist
+
+lipo -create -o $DESTDIR/$APPBUNDLE/Contents/MacOS/$BINARY $BIN_OBJ
+lipo -create -o $DESTDIR/$APPBUNDLE/Contents/MacOS/$DEDBIN $BIN_DEDOBJ
+cp $RENDER_OBJ $DESTDIR/$APPBUNDLE/Contents/MacOS/
+cp $BASE_OBJ $DESTDIR/$APPBUNDLE/Contents/MacOS/$BASEDIR/
+cp $MPACK_OBJ $DESTDIR/$APPBUNDLE/Contents/MacOS/$MPACKDIR/
+cp code/libs/macosx/*.dylib $DESTDIR/$APPBUNDLE/Contents/MacOS/
+