diff '--color=auto' -ura --color src.orig/gplates-2.1.0/cmake/modules/CompileOptionsCPlusPlus.cmake src/gplates-2.1.0/cmake/modules/CompileOptionsCPlusPlus.cmake
--- src.orig/gplates-2.1.0/cmake/modules/CompileOptionsCPlusPlus.cmake	2019-01-28 01:17:02.994296282 +1100
+++ src/gplates-2.1.0/cmake/modules/CompileOptionsCPlusPlus.cmake	2019-01-28 01:20:15.254774332 +1100
@@ -123,7 +123,7 @@
         set(warnings_flags "${warnings_flags} ${warning}")
     endforeach(warning ${warnings_flags_list})
 	
-	set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -ansi -fno-strict-aliasing")
+	set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fno-strict-aliasing")
 
     # Flags common to all build types.
     if (GPLATES_PUBLIC_RELEASE)