diff -up gdl-0.9.8/src/basic_fun.cpp.std gdl-0.9.8/src/basic_fun.cpp
--- gdl-0.9.8/src/basic_fun.cpp.std	2018-04-11 09:17:16.200257202 -0600
+++ gdl-0.9.8/src/basic_fun.cpp	2018-04-11 09:20:12.854448333 -0600
@@ -111,6 +111,7 @@ namespace lib {
   std::vector<char*> command_line_args;
 
   //  using namespace std;
+  using std::isinf;
   using std::isnan;
   using namespace antlr;