diff --git a/cinelerra-5.1/configure.ac b/cinelerra-5.1/configure.ac
index 90048a2..5948fba 100644
--- a/cinelerra-5.1/configure.ac
+++ b/cinelerra-5.1/configure.ac
@@ -321,10 +321,17 @@ PKG_3RD([libvorbis],[auto],
     lib/.libs/libvorbisfile.a ],
   [ include . ])
 
+## arch dep tests
+ARCH=[`uname -m`]
+I86=[`expr "x$ARCH" : 'xi[346]86.*'`]
+X86=[`expr "x$ARCH" : 'x..._64*'`]
+
+if test "x$I86$X86" != "x00" ; then
+
 PKG_3RD([mjpegtools],[yes],
   [mjpegtools-2.1.0],
-  [ utils/mmxsse/.libs/libmmxsse.a \
-    utils/.libs/libmjpegutils.a \
+   [ utils/.libs/libmjpegutils.a \
+    utils/mmxsse/.libs/libmmxsse.a \
     lavtools/.libs/liblavfile.a \
     lavtools/.libs/liblavjpeg.a \
     mplex/.libs/libmplex2.a \
@@ -332,6 +339,21 @@ PKG_3RD([mjpegtools],[yes],
     mpeg2enc/.libs/libmpeg2encpp.a ],
   [ .  lavtools utils ])
 
+else
+
+
+PKG_3RD([mjpegtools],[yes],
+  [mjpegtools-2.1.0],
+    [ utils/.libs/libmjpegutils.a \
+    lavtools/.libs/liblavfile.a \
+    lavtools/.libs/liblavjpeg.a \
+    mplex/.libs/libmplex2.a \
+    yuvfilters/.libs/libyuvfilters.a \
+    mpeg2enc/.libs/libmpeg2encpp.a ],
+  [ .  lavtools utils ])
+
+fi
+
 PKG_3RD([openexr],[auto],
   [openexr-2.2.1],
   [ IlmImf/.libs/libIlmImf.a \
@@ -369,7 +391,7 @@ PKG_3RD([x265],[auto],
   [ libx265.a ],
   [ . source ])
 
-PKG_3RD([libvpx],[auto],
+PKG_3RD([libvpx],[yes],
   [libvpx-1.8.0],
   [ libvpx.a ],
   [ . ])