diff -up src/sage/libs/lcalc/lcalc_Lfunction.pxd.orig src/sage/libs/lcalc/lcalc_Lfunction.pxd
--- src/sage/libs/lcalc/lcalc_Lfunction.pxd.orig	2018-05-05 16:21:24.000000000 -0600
+++ src/sage/libs/lcalc/lcalc_Lfunction.pxd	2018-05-22 13:31:10.717337490 -0600
@@ -1,6 +1,6 @@
 # Lcalc requires GNU extensions, it does not strictly conform to any
 # C++ standard: https://trac.sagemath.org/ticket/23341
-# distutils: extra_compile_args = -std=gnu++98
+# distutils: extra_compile_args = -std=gnu++11
 
 cdef extern from "lcalc_sage.h":
     ctypedef struct doublevec "std::vector<double>":
diff -up src/sage/libs/lcalc/lcalc_sage.h.orig src/sage/libs/lcalc/lcalc_sage.h
--- src/sage/libs/lcalc/lcalc_sage.h.orig	2018-05-05 16:21:24.000000000 -0600
+++ src/sage/libs/lcalc/lcalc_sage.h	2018-05-22 13:30:32.012839737 -0600
@@ -1,4 +1,4 @@
-#include "libLfunction/L.h"
+#include "Lfunction/L.h"
 
 int *new_ints(int l)
 {