Visual Studio doesn't support std::getenv, so we use Windows-specific

code.

src/common/bspf.hxx

@@ -249,14 +249,25 @@ namespace BSPF
   // Coverity complains if 'getenv' is used unrestricted
   inline string getenv(const string& env_var)
   {
+  #if (defined BSPF_WINDOWS || defined __WIN32__) && !defined __GNUG__
+    char* buf = nullptr;
+    size_t sz = 0;
+    if(_dupenv_s(&buf, &sz, env_var.c_str()) == 0 && buf != nullptr)
+    {
+      string val(buf);
+      free(buf);
+      return val;
+    }
+    return EmptyString;
+  #else
     try {
       const char* val = std::getenv(env_var.c_str());
-
       return val ? string(val) : EmptyString;
     }
     catch(...) {
       return EmptyString;
     }
+  #endif
   }
 } // namespace BSPF