diff -Nru suitesparse-5.1.2~beta/debian/patches/buildflags.patch suitesparse-5.1.2~beta/debian/patches/buildflags.patch
--- suitesparse-5.1.2~beta/debian/patches/buildflags.patch	2017-12-25 22:44:27.000000000 +0200
+++ suitesparse-5.1.2~beta/debian/patches/buildflags.patch	2017-12-28 08:52:11.000000000 +0200
@@ -3,9 +3,10 @@
  - remove optimization flags because we want to support noopt option
  - remove -fPIC because we don't want to use it for static libraries (and debian/rules
    re-adds it for dynamic libraries)
+ - link libgraphblasdemo with libm to fix build with -Wl,--as-needed
 Author: Sébastien Villemot <sebastien@debian.org>
 Forwarded: not-needed
-Last-Update: 2017-12-01
+Last-Update: 2017-12-28
 ---
 This patch header follows DEP-3: http://dep.debian.net/deps/dep3/
 --- a/CSparse/Demo/Makefile
@@ -47,3 +48,14 @@
      endif
  
      #---------------------------------------------------------------------------
+--- a/GraphBLAS/CMakeLists.txt
++++ b/GraphBLAS/CMakeLists.txt
+@@ -137,7 +137,7 @@
+     C_STANDARD_REQUIRED 11 )
+ set_property ( TARGET graphblasdemo_static PROPERTY C_STANDARD 11 )
+ 
+-target_link_libraries ( graphblasdemo         graphblas )
++target_link_libraries ( graphblasdemo         m graphblas )
+ target_link_libraries ( graphblasdemo_static  graphblas_static )
+ 
+ # Demo programs