diff --git a/build-support/compiler-workarounds/ostream-operator-nullptr.h b/build-support/compiler-workarounds/ostream-operator-nullptr.h
index e13efe342..feb6b48b7 100644
--- a/build-support/compiler-workarounds/ostream-operator-nullptr.h
+++ b/build-support/compiler-workarounds/ostream-operator-nullptr.h
@@ -7,7 +7,7 @@
 namespace std
 {
 inline std::ostream&
-operator<<(std::ostream& os, std::nullptr_t ptr)
+operator<<(std::ostream& os, std::nullptr_t)
 {
     return os << "nullptr"; // whatever you want nullptr to show up as in the console
 }
diff --git a/build-support/empty-main.cc b/build-support/empty-main.cc
index df67b9156..1949917ac 100644
--- a/build-support/empty-main.cc
+++ b/build-support/empty-main.cc
@@ -1,4 +1,5 @@
 int
 main()
 {
+    return 0;
 }