diff -up src/module_list.py.orig src/module_list.py --- src/module_list.py.orig 2019-01-16 09:42:41.397004883 -0700 +++ src/module_list.py 2019-01-16 09:45:43.332740109 -0700 @@ -513,7 +513,7 @@ ext_modules = [ Extension('sage.libs.lcalc.lcalc_Lfunction', sources = ['sage/libs/lcalc/lcalc_Lfunction.pyx'], libraries = ['m', 'ntl', 'Lfunction'], - extra_compile_args=["-O3", "-ffast-math"], + extra_compile_args=["-std=gnu++11", "-ffast-math"], language = 'c++'), Extension('sage.libs.libecm',