diff --git a/librsb.changes b/librsb.changes
index 72b5d8d..95b77b5 100644
--- a/librsb.changes
+++ b/librsb.changes
@@ -1,3 +1,9 @@
+-------------------------------------------------------------------
+Thu Jul 12 05:02:16 UTC 2018 - bwiedemann@suse.com
+
+- Add reproducible.patch and set an explicit memory hierarchy
+  to make build reproducible (boo#1100677)
+
 -------------------------------------------------------------------
 Tue Dec 26 14:10:41 UTC 2017 - jengelh@inai.de
 
diff --git a/librsb.spec b/librsb.spec
index 42556f5..5121a3a 100644
--- a/librsb.spec
+++ b/librsb.spec
@@ -28,6 +28,7 @@ Url:            http://librsb.sf.net/
 
 Source:         http://downloads.sf.net/%name/%name-%rversion.tar.gz
 Patch1:         pun.diff
+Patch2:         reproducible.patch
 BuildRequires:  fdupes
 BuildRequires:  gcc-fortran
 BuildRequires:  gsl-devel
@@ -70,9 +71,11 @@ applications that want to make use of librsb.
 %prep
 %setup -qn librsb-%rversion
 %patch -P 1 -p1
+%patch2 -p1
 
 %build
-%configure --docdir="%_docdir/%name" --disable-static CFLAGS="%optflags -Wno-unused"
+%configure --docdir="%_docdir/%name" --disable-static CFLAGS="%optflags -Wno-unused" \
+    --with-memhinfo=L3:16/64/8192K,L2:16/64/2048K,L1:8/64/16K
 make %{?_smp_mflags}
 
 %install
diff --git a/reproducible.patch b/reproducible.patch
new file mode 100644
index 0000000..a9eb57b
--- /dev/null
+++ b/reproducible.patch
@@ -0,0 +1,39 @@
+Author: Bernhard M. Wiedemann <bwiedemann suse de>
+Date: 2018-07-12
+
+When setting an explicit memory hierarchy at configure time,
+the autodetected one will never be used, so we do not need to store it.
+
+This allows for building identical librsb packages on different hosts.
+See https://reproducible-builds.org/ for why this is good.
+
+Index: librsb-1.2.0-rc7/configure
+===================================================================
+--- librsb-1.2.0-rc7.orig/configure
++++ librsb-1.2.0-rc7/configure
+@@ -22750,9 +22750,11 @@ cat >>confdefs.h <<_ACEOF
+ _ACEOF
+ 
+ 
++if test "x$memhinfo" = x; then
+ cat >>confdefs.h <<_ACEOF
+ #define RSB_DETECTED_MEM_HIERARCHY_INFO "$RSB_DETECTED_MEM_HIERARCHY_INFO"
+ _ACEOF
++fi
+ 
+ 
+ cat >>confdefs.h <<_ACEOF
+Index: librsb-1.2.0-rc7/configure.ac
+===================================================================
+--- librsb-1.2.0-rc7.orig/configure.ac
++++ librsb-1.2.0-rc7/configure.ac
+@@ -319,7 +319,9 @@ dnl
+ AC_ARG_WITH(memhinfo, AC_HELP_STRING([--with-memhinfo], [Compile with user specified memory hierarchy information, which can be overridden by runtime detection and runtime read of RSB_USER_SET_MEM_HIERARCHY_INFO environment variable.]),
+         [if test "x$withval" = xno; then memhinfo="" ; openmp_flags= ; else memhinfo="$withval" ; fi] , [memhinfo="";])
+ AC_SUBST([RSB_USER_SET_MEM_HIERARCHY_INFO],"${memhinfo}")
++if test "x$memhinfo" = x; then
+ AC_SUBST([RSB_DETECTED_MEM_HIERARCHY_INFO],"${detected_memhinfo}")
++fi
+ dnl AC_DEFINE([RSB_USER_SET_MEM_HIERARCHY_INFO],[$memhinfo],[If not null, the library will rely on this for memory hierarchy info.])
+ dnl
+ dnl