--- a/GraphBLAS/CMakeLists.txt
+++ b/GraphBLAS/CMakeLists.txt
@@ -87,6 +87,7 @@
     C_STANDARD_REQUIRED 11
     PUBLIC_HEADER "Include/GraphBLAS.h" )
 set_property ( TARGET graphblas PROPERTY C_STANDARD 11 )
+target_link_libraries ( graphblas m )

 # create the static graphblas library.  Requires ANSI C11
 add_library ( graphblas_static STATIC ${GRAPHBLAS_SOURCES} )