diff --git a/fflas-ffpack.changes b/fflas-ffpack.changes
index 141d52d..09bd9ba 100644
--- a/fflas-ffpack.changes
+++ b/fflas-ffpack.changes
@@ -1,3 +1,8 @@
+-------------------------------------------------------------------
+Fri Jul 13 04:38:53 UTC 2018 - bwiedemann@suse.com
+
+- Add reproducible.patch to disable compile-time CPU detection (boo#1100677)
+
 -------------------------------------------------------------------
 Tue Jun 19 15:49:54 UTC 2018 - schwab@suse.de
 
diff --git a/fflas-ffpack.spec b/fflas-ffpack.spec
index bd6fc84..1c4b0b2 100644
--- a/fflas-ffpack.spec
+++ b/fflas-ffpack.spec
@@ -35,6 +35,7 @@ Url:            https://linbox-team.github.io/fflas-ffpack/
 
 #Git-Clone:	https://github.com/linbox-team/fflas-ffpack
 Source:         https://github.com/linbox-team/%name/archive/v%version.tar.gz
+Patch0:         reproducible.patch
 BuildRequires:  doxygen
 BuildRequires:  fdupes
 BuildRequires:  gcc-c++
@@ -79,6 +80,7 @@ the FFLAS-FFPACK API.
 
 %prep
 %setup -q
+%patch0 -p1
 
 #Do not compile in DATE and TIME
 sed '/HTML_TIMESTAMP/s/YES/NO/' -i doc/Doxyfile
diff --git a/reproducible.patch b/reproducible.patch
new file mode 100644
index 0000000..142ff55
--- /dev/null
+++ b/reproducible.patch
@@ -0,0 +1,14 @@
+Index: fflas-ffpack-2.3.2/configure.ac
+===================================================================
+--- fflas-ffpack-2.3.2.orig/configure.ac
++++ fflas-ffpack-2.3.2/configure.ac
+@@ -172,9 +172,6 @@ echo "----------------------------------
+ FF_CHECK_OMP
+ 
+ 
+-# Checks which SIMD optimization flags to use and set SIMD_CFLAGS accordingly
+-INSTR_SET
+-AC_SUBST(SIMD_FLAGS)
+ 
+ dnl gcc-4.9.2 bug See https://trac.sagemath.org/ticket/17635#comment:178
+ AS_IF([ test  "x$CCNAM" = "xgcc492" ],[REQUIRED_FLAGS="${REQUIRED_FLAGS} -fpermissive"],[])