diff -up src/sage/libs/lcalc/lcalc_Lfunction.pyx.orig src/sage/libs/lcalc/lcalc_Lfunction.pyx --- src/sage/libs/lcalc/lcalc_Lfunction.pyx.orig 2020-10-24 11:37:59.000000000 -0600 +++ src/sage/libs/lcalc/lcalc_Lfunction.pyx 2020-10-30 14:40:53.875121354 -0600 @@ -1,5 +1,5 @@ # distutils: libraries = m ntl Lfunction -# distutils: extra_compile_args = -O3 -ffast-math +# distutils: extra_compile_args = -std=gnu++11 -ffast-math # distutils: language = c++ r""" Rubinstein's lcalc library