--- configure.in~
+++ configure.in
@@ -3230,6 +3230,7 @@ EOF
                        ac_cv_have_visibility_class_bug,
                        [cat > conftest.c <<EOF
 #pragma GCC visibility push(hidden)
+struct TestStruct;
 struct __attribute__ ((visibility ("default"))) TestStruct {
   static void Init();
 };
--- mozilla/configure.in~
+++ mozilla/configure.in
@@ -3230,6 +3230,7 @@ EOF
                        ac_cv_have_visibility_class_bug,
                        [cat > conftest.c <<EOF
 #pragma GCC visibility push(hidden)
+struct TestStruct;
 struct __attribute__ ((visibility ("default"))) TestStruct {
   static void Init();
 };
--- mozilla/js/src/configure.in~
+++ mozilla/js/src/configure.in
@@ -3230,6 +3230,7 @@ EOF
                        ac_cv_have_visibility_class_bug,
                        [cat > conftest.c <<EOF
 #pragma GCC visibility push(hidden)
+struct TestStruct;
 struct __attribute__ ((visibility ("default"))) TestStruct {
   static void Init();
 };