--- /usr/portage/media-video/mjpegtools/mjpegtools-1.8.0.ebuild	2005-10-05 05:06:32.000000000 -0300
+++ /usr/local/portage/media-video/mjpegtools/mjpegtools-1.8.0.ebuild	2005-10-07 16:11:07.000000000 -0300
@@ -69,6 +69,11 @@
 		[[ $(gcc-major-version) -eq 3 ]] && append-flags -mno-sse2
 	fi
 
+	if use amd64; then
+		myconf="${myconf} --enable-simd-accel"
+		myconf="${myconf} --enable-cmov-extension"
+	fi
+
 	econf \
 		$(use_with X x) \
 		$(use_enable dga xfree-ext) \