diff -up src/module_list.py.orig src/module_list.py --- src/module_list.py.orig 2019-06-27 11:30:20.794201914 -0600 +++ src/module_list.py 2019-06-27 11:38:23.103196674 -0600 @@ -514,7 +514,7 @@ 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',