From a42f478170bedbef842eca6a4ebf35d749299d0f Mon Sep 17 00:00:00 2001
From: Wolfgang Bangerth <bangerth@math.tamu.edu>
Date: Mon, 25 Jul 2016 12:57:07 -0500
Subject: [PATCH] Use portable version of erfc().

erfc is only part of C99, and thus not in C++98. It did make it into C++ via the TR1
addition, which I think is in C++03 and consequently in C++11, but be that as it may,
let's just use the BOOST version of it to be on the safe side.
---
 source/base/function_parser.cc | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/source/base/function_parser.cc b/source/base/function_parser.cc
index e00dddadf8..87b58ae575 100644
--- a/source/base/function_parser.cc
+++ b/source/base/function_parser.cc
@@ -23,6 +23,7 @@
 
 DEAL_II_DISABLE_EXTRA_DIAGNOSTICS
 #include <boost/random.hpp>
+#include <boost/math/special_functions/erf.hpp>
 DEAL_II_ENABLE_EXTRA_DIAGNOSTICS
 
 #ifdef DEAL_II_WITH_MUPARSER
@@ -182,7 +183,7 @@ namespace internal
 
   double mu_erfc(double value)
   {
-    return erfc(value);
+    return boost::math::erfc(value);
   }
 
   // returns a random value in the range [0,1] initializing the generator
-- 
2.39.5