diff --git a/ortools/base/file.cc b/ortools/base/file.cc
--- a/ortools/base/file.cc
+++ b/ortools/base/file.cc
@@ -223,7 +223,7 @@ absl::Status GetContents(absl::string_view filename, std::string* output,
   }
 #endif  // _MSC_VER

-  file->Close(options).IgnoreError();  // Even if ReadToString() fails!
+  static_cast<void>(file->Close(options));  // Even if ReadToString() fails!
   return absl::Status(absl::StatusCode::kInvalidArgument,
                       absl::StrCat("Could not read from '", filename, "'."));
 }
diff --git a/ortools/linear_solver/BUILD.bazel b/ortools/linear_solver/BUILD.bazel
--- a/ortools/linear_solver/BUILD.bazel
+++ b/ortools/linear_solver/BUILD.bazel
@@ -201,7 +201,6 @@ cc_library(
         "//conditions:default": [],
     }) + select({
         ":use_scip": [
-            "lpi_glop.cpp",
             "scip_callback.cc",
             "scip_interface.cc",
         ],
diff --git a/ortools/port/proto_utils.h b/ortools/port/proto_utils.h
--- a/ortools/port/proto_utils.h
+++ b/ortools/port/proto_utils.h
@@ -58,7 +58,7 @@ std::string ProtoEnumToString(ProtoEnumType enum_value) {
         "Invalid enum value of: ", enum_value, " for enum type: ",
         google::protobuf::GetEnumDescriptor<ProtoEnumType>()->name());
   }
-  return enum_value_descriptor->name();
+  return std::string(enum_value_descriptor->name());
 #endif  // !defined(__PORTABLE_PLATFORM__)
 }