diff --git a/ortools/graph/cliques_test.cc b/ortools/graph/cliques_test.cc
index 99bd0c03d25..ee9936b7298 100644
--- a/ortools/graph/cliques_test.cc
+++ b/ortools/graph/cliques_test.cc
@@ -157,12 +157,13 @@ void RunBronKerboschAlgorithmUntilCompletion(
 TEST(BronKerbosch, CompleteGraph) {
   constexpr int kNumNodes[] = {1, 5, 50, 500, 5000};
   for (const int num_nodes : kNumNodes) {
-    ResultCallback2<bool, int, int>* graph = NewPermanentCallback(FullGraph);
+    auto graph = FullGraph;
     CliqueReporter<int> reporter;
     auto callback =
         absl::bind_front(&CliqueReporter<int>::AppendClique, &reporter);
     operations_research::FindCliques(
-        graph, num_nodes, ::util::functional::ToPermanentCallback(callback));
+        ::util::functional::ToPermanentCallback(graph), num_nodes,
+        ::util::functional::ToPermanentCallback(callback));
     const std::vector<std::vector<int>>& all_cliques = reporter.all_cliques();
     EXPECT_EQ(1, all_cliques.size());
     EXPECT_EQ(num_nodes, all_cliques[0].size());
@@ -236,12 +237,13 @@ TEST(BronKerboschAlgorithmTest, CompleteGraphWithInt64) {
 }
 
 TEST(BronKerbosch, EmptyGraph) {
-  ResultCallback2<bool, int, int>* graph = NewPermanentCallback(EmptyGraph);
+  auto graph = EmptyGraph;
   CliqueReporter<int> reporter;
   auto callback =
       absl::bind_front(&CliqueReporter<int>::AppendClique, &reporter);
   operations_research::FindCliques(
-      graph, 10, ::util::functional::ToPermanentCallback(callback));
+      ::util::functional::ToPermanentCallback(graph), 10,
+      ::util::functional::ToPermanentCallback(callback));
   const std::vector<std::vector<int>>& all_cliques = reporter.all_cliques();
   EXPECT_EQ(10, all_cliques.size());
   for (int i = 0; i < 10; ++i) {
@@ -328,12 +330,13 @@ TEST(BronKerboschAlgorithmTest, EmptyGraphStopAfterEveryClique) {
 }
 
 TEST(BronKerbosch, MatchingGraph) {
-  ResultCallback2<bool, int, int>* graph = NewPermanentCallback(MatchingGraph);
+  auto graph = MatchingGraph;
   CliqueReporter<int> reporter;
   auto callback =
       absl::bind_front(&CliqueReporter<int>::AppendClique, &reporter);
   operations_research::FindCliques(
-      graph, 10, ::util::functional::ToPermanentCallback(callback));
+      ::util::functional::ToPermanentCallback(graph), 10,
+      ::util::functional::ToPermanentCallback(callback));
   const std::vector<std::vector<int>>& all_cliques = reporter.all_cliques();
   EXPECT_EQ(5, all_cliques.size());
   for (int i = 0; i < 5; ++i) {
@@ -397,35 +400,38 @@ TEST(BronKerboschAlgorithmTest, ModuloGraph) {
 }
 
 TEST(BronKerbosch, CompleteGraphCover) {
-  ResultCallback2<bool, int, int>* graph = NewPermanentCallback(FullGraph);
+  auto graph = FullGraph;
   CliqueReporter<int> reporter;
   auto callback =
       absl::bind_front(&CliqueReporter<int>::AppendClique, &reporter);
   operations_research::CoverArcsByCliques(
-      graph, 10, ::util::functional::ToPermanentCallback(callback));
+      ::util::functional::ToPermanentCallback(graph), 10,
+      ::util::functional::ToPermanentCallback(callback));
   const std::vector<std::vector<int>>& all_cliques = reporter.all_cliques();
   EXPECT_EQ(1, all_cliques.size());
   EXPECT_EQ(10, all_cliques[0].size());
 }
 
 TEST(BronKerbosch, EmptyGraphCover) {
-  ResultCallback2<bool, int, int>* graph = NewPermanentCallback(EmptyGraph);
+  auto graph = EmptyGraph;
   CliqueReporter<int> reporter;
   auto callback =
       absl::bind_front(&CliqueReporter<int>::AppendClique, &reporter);
   operations_research::CoverArcsByCliques(
-      graph, 10, ::util::functional::ToPermanentCallback(callback));
+      ::util::functional::ToPermanentCallback(graph), 10,
+      ::util::functional::ToPermanentCallback(callback));
   const std::vector<std::vector<int>>& all_cliques = reporter.all_cliques();
   EXPECT_EQ(0, all_cliques.size());
 }
 
 TEST(BronKerbosch, MatchingGraphCover) {
-  ResultCallback2<bool, int, int>* graph = NewPermanentCallback(MatchingGraph);
+  auto graph = MatchingGraph;
   CliqueReporter<int> reporter;
   auto callback =
       absl::bind_front(&CliqueReporter<int>::AppendClique, &reporter);
   operations_research::CoverArcsByCliques(
-      graph, 10, ::util::functional::ToPermanentCallback(callback));
+      ::util::functional::ToPermanentCallback(graph), 10,
+      ::util::functional::ToPermanentCallback(callback));
   const std::vector<std::vector<int>>& all_cliques = reporter.all_cliques();
   EXPECT_EQ(5, all_cliques.size());
   for (int i = 0; i < 5; ++i) {
diff --git a/ortools/linear_solver/linear_solver.h b/ortools/linear_solver/linear_solver.h
index c7e3eac8ef0..ba1b543bccf 100644
--- a/ortools/linear_solver/linear_solver.h
+++ b/ortools/linear_solver/linear_solver.h
@@ -138,6 +138,7 @@
 #include <cstdint>
 #include <functional>
 #include <limits>
+#include <map>
 #include <memory>
 #include <optional>
 #include <ostream>
diff --git a/ortools/lp_data/lp_data.h b/ortools/lp_data/lp_data.h
index 138d12cc01d..eb82d274121 100644
--- a/ortools/lp_data/lp_data.h
+++ b/ortools/lp_data/lp_data.h
@@ -33,6 +33,7 @@
 
 #include "absl/container/flat_hash_map.h"
 #include "absl/container/flat_hash_set.h"
+#include "absl/strings/string_view.h"
 #include "ortools/base/hash.h"
 #include "ortools/base/logging.h"  // for CHECK*
 #include "ortools/glop/parameters.pb.h"
@@ -75,7 +76,7 @@ class LinearProgram {
   void Clear();
 
   // Name setter and getter.
-  void SetName(const std::string& name) { name_ = name; }
+  void SetName(absl::string_view name) { name_ = name; }
   const std::string& name() const { return name_; }
 
   // Creates a new variable and returns its index.
diff --git a/ortools/lp_data/mps_reader.cc b/ortools/lp_data/mps_reader.cc
index 3e0eba8d2d0..78f2bdb1f44 100644
--- a/ortools/lp_data/mps_reader.cc
+++ b/ortools/lp_data/mps_reader.cc
@@ -51,7 +51,7 @@ class DataWrapper<LinearProgram> {
     data_->Clear();
   }
 
-  void SetName(absl::string_view name) { data_->SetName(std::string(name)); }
+  void SetName(absl::string_view name) { data_->SetName(name); }
 
   void SetObjectiveDirection(bool maximize) {
     data_->SetMaximizationProblem(maximize);