diff -Naur a/CMakeLists.txt b/CMakeLists.txt
--- a/CMakeLists.txt	2021-06-16 22:53:02.033465000 +0800
+++ b/CMakeLists.txt	2021-06-16 23:01:31.542323600 +0800
@@ -25,7 +25,9 @@
 # ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 # DEALINGS IN THE SOFTWARE.
 
-cmake_minimum_required(VERSION 2.8.2)
+cmake_minimum_required(VERSION 3.1)
+
+set(CMAKE_CXX_STANDARD 11)
 
 # Override flags to enable prepare for linking to static runtime
 set(CMAKE_USER_MAKE_RULES_OVERRIDE ${CMAKE_CURRENT_SOURCE_DIR}/cmake/c_flag_overrides.cmake)
diff -Naur a/src/tools/e57fields.cpp b/src/tools/e57fields.cpp
--- a/src/tools/e57fields.cpp	2012-04-04 17:19:01.000000000 +0800
+++ b/src/tools/e57fields.cpp	2021-06-16 22:55:02.789463000 +0800
@@ -30,11 +30,7 @@
 #include <iomanip>
 #include <float.h>
 #include <map>
-#if defined(_MSC_VER)
-#   include <memory>
-#else
-#   include <tr1/memory>
-#endif
+#include <memory>
 #include "E57Foundation.h"
 #include "E57FoundationImpl.h" //??? for exceptions, should be in separate file
 
@@ -43,7 +39,6 @@
 
 using namespace e57;
 using namespace std;
-using namespace std::tr1;
 
 //!!! prologue, file name, date, version#, total # elements
 //!!! doc
@@ -446,9 +441,9 @@
     /// Only one is used, depending on the type of the E57 element.
     /// One of these three should be resized to BUFFER_ELEMENT_COUNT.
     /// These are smart pointers to avoid the copying (and the moving) when put on the cvElements list.
-    shared_ptr<vector<int64_t> > iBuffer;
-    shared_ptr<vector<double> >  dBuffer;
-    shared_ptr<vector<string> >  sBuffer;
+    std::shared_ptr<vector<int64_t> > iBuffer;
+    std::shared_ptr<vector<double> >  dBuffer;
+    std::shared_ptr<vector<string> >  sBuffer;
 
     /// The precalculated parts of the element path name.
     /// The only part that is missing is the record number which goes in between.
diff -Naur a/src/tools/e57unpack.cpp b/src/tools/e57unpack.cpp
--- a/src/tools/e57unpack.cpp	2011-10-06 16:01:00.000000000 +0800
+++ b/src/tools/e57unpack.cpp	2021-06-16 22:56:57.150323800 +0800
@@ -41,12 +41,8 @@
 #include <stdexcept>
 using std::runtime_error;
 
-#if defined(_MSC_VER)
-#   include <memory>
-#else
-#   include <tr1/memory>
-#endif
-using std::tr1::shared_ptr;
+#include <memory>
+using std::shared_ptr;
 
 #include <string>
 using std::string;
diff -Naur a/src/tools/e57validate.cpp b/src/tools/e57validate.cpp
--- a/src/tools/e57validate.cpp	2011-10-06 16:01:00.000000000 +0800
+++ b/src/tools/e57validate.cpp	2021-06-16 22:58:19.365323700 +0800
@@ -66,11 +66,8 @@
 
 
 ================================================================*/
-#if defined(_MSC_VER)
-#   include <unordered_map>
-#else
-#   include <tr1/unordered_map>
-using std::tr1::unordered_map;
+
+#include <unordered_map>
+using std::unordered_map;
-#endif
 #include <cstring>
 using std::strlen;
@@ -694,7 +692,7 @@
     void        dump(int indent = 0, std::ostream& os = std::cout);
 //================
 private:
-    typedef std::tr1::unordered_map<int64_t, LineGroup> GroupsMap;
+    typedef std::unordered_map<int64_t, LineGroup> GroupsMap;
 
     bool        isDefined_;
     bool        isByRow_;