Conditionalized some boost::filesystem calls that were too new.

python/pyinterp.h

@@ -109,10 +109,18 @@ public:
     python::object sys_dict = module_sys.attr("__dict__");
 
     python::list paths(sys_dict["path"]);
+#if BOOST_VERSION >= 103700
     paths.insert(0, file.parent_path().string());
+#else
+    paths.insert(0, file.branch_path().string());
+#endif
     sys_dict["path"] = paths;
 
+#if BOOST_VERSION >= 103700
     import(file.stem());
+#else
+    import(file.string());
+#endif
     return true;
   }
 };

src/stream.cc

@@ -87,7 +87,11 @@ namespace {
       // Find command name: its the substring starting right of the
       // rightmost '/' character in the pager pathname.  See manpage for
       // strrchr.
+#if BOOST_VERSION >= 103700
       path basename(pager_path.filename());
+#else
+      path basename(pager_path.leaf());
+#endif
       execlp(pager_path.string().c_str(), basename.string().c_str(),
 	     (char *)0);