diff -Nru lua-torch-torch7-0~20170926-g89ede3b/debian/changelog lua-torch-torch7-0~20170926-g89ede3b/debian/changelog
--- lua-torch-torch7-0~20170926-g89ede3b/debian/changelog	2018-04-21 03:56:49.000000000 +0000
+++ lua-torch-torch7-0~20170926-g89ede3b/debian/changelog	2018-05-10 07:51:55.000000000 +0000
@@ -1,3 +1,14 @@
+lua-torch-torch7 (0~20170926-g89ede3b-4) unstable; urgency=medium
+
+  * README.Debian: Add instructions for MKL user. One needs to rebuild
+    this package to utilize MKL or the unit tests would fail.
+    (Closes: #897894)
+  * Disable Multi-Arch support for all packages. Multi-Arch installation
+    of packages produced by this source won't bring any advantage.
+    (Closes: #897339)
+
+ -- Mo Zhou <cdluminate@gmail.com>  Thu, 10 May 2018 07:51:55 +0000
+
 lua-torch-torch7 (0~20170926-g89ede3b-3) unstable; urgency=medium
 
   * Add watch file to monitor upstream master branch.
diff -Nru lua-torch-torch7-0~20170926-g89ede3b/debian/control lua-torch-torch7-0~20170926-g89ede3b/debian/control
--- lua-torch-torch7-0~20170926-g89ede3b/debian/control	2018-04-21 03:50:58.000000000 +0000
+++ lua-torch-torch7-0~20170926-g89ede3b/debian/control	2018-05-10 07:44:28.000000000 +0000
@@ -24,7 +24,6 @@
 
 Package: lua-torch-torch7
 Architecture: amd64 i386 armel armhf ppc64el kfreebsd-amd64
-Multi-Arch: same
 # NOTE: users are expected to use luajit.
 # NOTE: even if upstream supports luajit, 5.1, 5.2 and 5.3
 Depends: ${misc:Depends}, ${shlibs:Depends}, luajit | lua5.1 ,
@@ -41,7 +40,6 @@
 Package: lua-torch-torch7-dev
 Architecture: amd64 i386 armel armhf ppc64el kfreebsd-amd64
 Section: libdevel
-Multi-Arch: same
 Depends: ${misc:Depends}, ${shlibs:Depends},
          lua-torch-torch7 (= ${binary:Version})
 XB-Lua-Versions: ${lua:Versions}
@@ -56,7 +54,6 @@
 Package: libtorch-th
 Architecture: amd64 i386 armel armhf ppc64el kfreebsd-amd64
 Section: libs
-Multi-Arch: same
 Depends: ${misc:Depends}, ${shlibs:Depends},
          libblas3 | libblas.so.3,
          liblapack3 | liblapack.so.3,
@@ -71,7 +68,6 @@
 Package: libtorch-th-dev
 Architecture: amd64 i386 armel armhf ppc64el kfreebsd-amd64
 Section: libdevel
-Multi-Arch: same
 Depends: ${misc:Depends}, ${shlibs:Depends}, libtorch-th (= ${binary:Version})
 Description: libTH.so of Torch Package for Torch Framework (dev)
  Torch is the main package in Torch7 where data structures for
@@ -84,7 +80,6 @@
 Package: libtorch-luat
 Architecture: amd64 i386 armel armhf ppc64el kfreebsd-amd64
 Section: libs
-Multi-Arch: same
 Depends: ${misc:Depends}, ${shlibs:Depends}
 Description: libluaT.so of Torch Package for Torch Framework
  Torch is the main package in Torch7 where data structures for
@@ -97,7 +92,6 @@
 Package: libtorch-luat-dev
 Architecture: amd64 i386 armel armhf ppc64el kfreebsd-amd64
 Section: libdevel
-Multi-Arch: same
 Depends: ${misc:Depends}, ${shlibs:Depends}, libtorch-luat (= ${binary:Version})
 Description: libluaT.so of Torch Package for Torch Framework (dev)
  Torch is the main package in Torch7 where data structures for
diff -Nru lua-torch-torch7-0~20170926-g89ede3b/debian/README.Debian lua-torch-torch7-0~20170926-g89ede3b/debian/README.Debian
--- lua-torch-torch7-0~20170926-g89ede3b/debian/README.Debian	2017-10-25 11:39:28.000000000 +0000
+++ lua-torch-torch7-0~20170926-g89ede3b/debian/README.Debian	2018-05-10 07:43:02.000000000 +0000
@@ -12,3 +12,9 @@
 Quite simple. It should work well if the above command doesn't complain.
 
  -- Zhou Mo <cdluminate@gmail.com>  Mon, 03 Oct 2016 08:57:01 +0000
+
+You need to recompile this package if you want to use it with Intel's
+MKL library. Please check the instructions in debian/rules.
+(See #897894)
+
+ -- Mo Zhou <cdluminate@gmail.com>  Thu, 10 May 2018 07:19:58 +0000
diff -Nru lua-torch-torch7-0~20170926-g89ede3b/debian/rules lua-torch-torch7-0~20170926-g89ede3b/debian/rules
--- lua-torch-torch7-0~20170926-g89ede3b/debian/rules	2018-02-13 02:43:44.000000000 +0000
+++ lua-torch-torch7-0~20170926-g89ede3b/debian/rules	2018-05-10 07:51:40.000000000 +0000
@@ -9,6 +9,11 @@
 LUAJIT=/usr/bin/luajit
 ROOTDIR=$(shell pwd)
 
+# [Maintainer Note]
+# According to lib/TH/cmake/FindBLAS.cmake, if you want to use this package
+# with MKL, you need to recompile it after changing -DWITH_BLAS=generic to
+# -DWITH_BLAS=mkl . (See #897894)
+
 TORCH_FLAGS_5_1= \
  -DLUA=/usr/bin/lua5.1 \
  -DLUA_INCDIR=/usr/include/lua5.1 \