diff --git a/CMakeLists.txt b/CMakeLists.txt
index d89a2cabb..ed35aac93 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -79,8 +79,7 @@ set(NS3_OUTPUT_DIRECTORY "" CACHE STRING "Directory to store built artifacts")
 option(NS3_PRECOMPILE_HEADERS
        "Precompile module headers to speed up compilation" ON
 )
-option(NS3_PYTHON_BINDINGS "Build ns-3 python bindings" ON)
-option(NS3_REALTIME "Build with realtime support" ON)
+option(NS3_PYTHON_BINDINGS "Build ns-3 python bindings" OFF)
 option(NS3_SQLITE "Build with SQLite support" ON)
 option(NS3_STATIC "Build a static ns-3 library and link it against executables"
        OFF
diff --git a/build-support/core-config-template.h b/build-support/core-config-template.h
index 221486095..8a766c1ea 100644
--- a/build-support/core-config-template.h
+++ b/build-support/core-config-template.h
@@ -15,6 +15,5 @@
 #cmakedefine01 HAVE_STDLIB_H
 #cmakedefine01 HAVE_GETENV
 #cmakedefine01 HAVE_SIGNAL_H
-#cmakedefine   HAVE_RT
 
 #endif //NS3_CORE_CONFIG_H
diff --git a/build-support/custom-modules/ns3-configtable.cmake b/build-support/custom-modules/ns3-configtable.cmake
index 2b754ec2a..61b6da290 100644
--- a/build-support/custom-modules/ns3-configtable.cmake
+++ b/build-support/custom-modules/ns3-configtable.cmake
@@ -163,9 +163,6 @@ macro(write_configtable)
   string(APPEND out "Python Bindings               : ")
   check_on_or_off("${NS3_PYTHON_BINDINGS}" "${ENABLE_PYTHON_BINDINGS}")
 
-  string(APPEND out "Real Time Simulator           : ")
-  check_on_or_off("${NS3_REALTIME}" "${ENABLE_REALTIME}")
-
   string(APPEND out "SQLite support                : ")
   check_on_or_off("${NS3_SQLITE}" "${ENABLE_SQLITE}")
 
diff --git a/build-support/macros-and-definitions.cmake b/build-support/macros-and-definitions.cmake
index aaff4c81e..509d8f018 100644
--- a/build-support/macros-and-definitions.cmake
+++ b/build-support/macros-and-definitions.cmake
@@ -657,8 +657,6 @@ macro(process_options)
   if(${NS3_STATIC})
     # Warn users that they may be using shared libraries, which won't produce a
     # standalone static library
-    set(ENABLE_REALTIME FALSE)
-    set(HAVE_RT FALSE)
     message(
       WARNING "Statically linking 3rd party libraries have not been tested.\n"
               "Disable Brite, Click, Gtk, GSL, Mpi, Openflow and SQLite"
@@ -675,26 +673,6 @@ macro(process_options)
       add_definitions(-DHAVE_LIBXML2)
       include_directories(${LIBXML2_INCLUDE_DIR})
     endif()
-
-    # LibRT
-    mark_as_advanced(LIBRT)
-    set(ENABLE_REALTIME FALSE)
-    if(${NS3_REALTIME})
-      if(APPLE)
-        message(
-          STATUS "Lib RT is not supported on Mac OS X. Continuing without it."
-        )
-      else()
-        find_library(LIBRT rt QUIET)
-        if(NOT ${LIBRT_FOUND})
-          message(FATAL_ERROR "LibRT was not found.")
-        else()
-          message(STATUS "LibRT was found.")
-          set(ENABLE_REALTIME TRUE)
-          set(HAVE_RT TRUE) # for core-config.h
-        endif()
-      endif()
-    endif()
   endif()
 
   set(THREADS_PREFER_PTHREAD_FLAG)
diff --git a/examples/realtime/CMakeLists.txt b/examples/realtime/CMakeLists.txt
index c1ced707d..8124d5209 100644
--- a/examples/realtime/CMakeLists.txt
+++ b/examples/realtime/CMakeLists.txt
@@ -1,10 +1,8 @@
-if(${ENABLE_REALTIME})
-  build_example(
-    NAME realtime-udp-echo
-    SOURCE_FILES realtime-udp-echo.cc
-    LIBRARIES_TO_LINK
-      ${libcsma}
-      ${libinternet}
-      ${libapplications}
-  )
-endif()
+build_example(
+NAME realtime-udp-echo
+SOURCE_FILES realtime-udp-echo.cc
+LIBRARIES_TO_LINK
+    ${libcsma}
+    ${libinternet}
+    ${libapplications}
+)
diff --git a/examples/realtime/examples-to-run.py b/examples/realtime/examples-to-run.py
index 6d94ea760..2e58a0789 100644
--- a/examples/realtime/examples-to-run.py
+++ b/examples/realtime/examples-to-run.py
@@ -8,7 +8,7 @@
 #
 # See test.py for more information.
 cpp_examples = [
-    ("realtime-udp-echo", "ENABLE_REAL_TIME == True", "True"),
+    ("realtime-udp-echo", "True", "True"),
 ]
 
 # A list of Python examples to run in order to ensure that they remain
diff --git a/src/core/CMakeLists.txt b/src/core/CMakeLists.txt
index f48886de8..5a8954ca7 100644
--- a/src/core/CMakeLists.txt
+++ b/src/core/CMakeLists.txt
@@ -64,27 +64,6 @@ else()
   )
 endif()
 
-set(rt_sources)
-set(rt_headers)
-if(${ENABLE_REALTIME})
-  set(rt_sources
-      model/realtime-simulator-impl.cc
-      model/wall-clock-synchronizer.cc
-  )
-  set(rt_headers
-      model/realtime-simulator-impl.h
-      model/wall-clock-synchronizer.h
-  )
-  set(libraries_to_link
-      ${libraries_to_link}
-      ${LIBRT}
-  )
-endif()
-
-set(osclock_sources
-    model/unix-system-wall-clock-ms.cc
-)
-
 set(int64x64_sources)
 set(int64x64_headers)
 
@@ -146,8 +125,6 @@ endif()
 
 # Define core lib sources
 set(source_files
-    ${rt_sources}
-    ${osclock_sources}
     ${int64x64_sources}
     ${example_as_test_sources}
     ${embedded_version_sources}
@@ -210,15 +187,17 @@ set(source_files
     model/node-printer.cc
     model/show-progress.cc
     model/time-printer.cc
+    model/system-wall-clock-ms.cc
     model/system-wall-clock-timestamp.cc
     model/length.cc
     model/trickle-timer.cc
     model/unix-fd-reader.cc
+    model/realtime-simulator-impl.cc
+    model/wall-clock-synchronizer.cc
 )
 
 # Define core lib headers
 set(header_files
-    ${rt_headers}
     ${int64x64_headers}
     ${example_as_test_headers}
     ${embedded_version_headers}
@@ -317,6 +296,8 @@ set(header_files
     model/valgrind.h
     model/vector.h
     model/watchdog.h
+    model/realtime-simulator-impl.h
+    model/wall-clock-synchronizer.h
 )
 
 set(test_sources
diff --git a/src/core/examples/CMakeLists.txt b/src/core/examples/CMakeLists.txt
index 986927680..12a346cfb 100644
--- a/src/core/examples/CMakeLists.txt
+++ b/src/core/examples/CMakeLists.txt
@@ -42,14 +42,12 @@ if(${ENABLE_BUILD_VERSION})
   )
 endif()
 
-if(${ENABLE_REALTIME})
-  build_lib_example(
-    NAME main-test-sync
-    SOURCE_FILES main-test-sync.cc
-    LIBRARIES_TO_LINK ${libnetwork}
-                      ${CMAKE_THREAD_LIBS_INIT}
-  )
-endif()
+build_lib_example(
+  NAME main-test-sync
+  SOURCE_FILES main-test-sync.cc
+  LIBRARIES_TO_LINK ${libnetwork}
+                    ${CMAKE_THREAD_LIBS_INIT}
+)
 
 build_lib_example(
   NAME empirical-random-variable-example
diff --git a/src/core/model/wall-clock-synchronizer.cc b/src/core/model/wall-clock-synchronizer.cc
index ed17afe7b..39e5935c8 100644
--- a/src/core/model/wall-clock-synchronizer.cc
+++ b/src/core/model/wall-clock-synchronizer.cc
@@ -18,7 +18,6 @@
 
 #include <ctime>       // clock_t
 #include <sys/time.h>  // gettimeofday
-                       // clock_getres: glibc < 2.17, link with librt
 
 #include "log.h"
 #include "wall-clock-synchronizer.h"
diff --git a/src/core/test/threaded-test-suite.cc b/src/core/test/threaded-test-suite.cc
index ba512f194..5dfa74234 100644
--- a/src/core/test/threaded-test-suite.cc
+++ b/src/core/test/threaded-test-suite.cc
@@ -283,9 +283,7 @@ public:
     : TestSuite ("threaded-simulator")
   {
     std::string simulatorTypes[] = {
-#ifdef HAVE_RT
       "ns3::RealtimeSimulatorImpl",
-#endif
       "ns3::DefaultSimulatorImpl"
     };
     std::string schedulerTypes[] = {
@@ -294,7 +292,7 @@ public:
       "ns3::MapScheduler",
       "ns3::CalendarScheduler"
     };
-    unsigned int threadcounts[] = {
+    unsigned int threadCounts[] = {
       0,
       2,
       10,
@@ -302,14 +300,16 @@ public:
     };
     ObjectFactory factory;
 
-    for (unsigned int i = 0; i < (sizeof(simulatorTypes) / sizeof(simulatorTypes[0])); ++i)
+    for (auto &simulatorType : simulatorTypes)
       {
-        for (unsigned int j = 0; j < (sizeof(threadcounts) / sizeof(threadcounts[0])); ++j)
+        for (auto &schedulerType : schedulerTypes)
           {
-            for (unsigned int k = 0; k < (sizeof(schedulerTypes) / sizeof(schedulerTypes[0])); ++k)
+            for (auto &threadCount : threadCounts)
               {
-                factory.SetTypeId (schedulerTypes[k]);
-                AddTestCase (new ThreadedSimulatorEventsTestCase (factory, simulatorTypes[i], threadcounts[j]), TestCase::QUICK);
+                factory.SetTypeId (schedulerType);
+                AddTestCase (
+                    new ThreadedSimulatorEventsTestCase (factory, simulatorType, threadCount),
+                    TestCase::QUICK);
               }
           }
       }
diff --git a/src/fd-net-device/CMakeLists.txt b/src/fd-net-device/CMakeLists.txt
index dd9fa9d63..2d96aaee8 100644
--- a/src/fd-net-device/CMakeLists.txt
+++ b/src/fd-net-device/CMakeLists.txt
@@ -100,7 +100,6 @@ if(HAVE_NET_ETHERNET_H)
      AND HAVE_IF_TUN_H
      AND HAVE_SYS_IOCTL_H
      AND ${ENABLE_TAP}
-     AND ${ENABLE_REALTIME}
      AND ${ENABLE_EMU}
   )
     set(ENABLE_TAPNETDEV
diff --git a/src/fd-net-device/examples/CMakeLists.txt b/src/fd-net-device/examples/CMakeLists.txt
index 3d8265487..b314e8897 100644
--- a/src/fd-net-device/examples/CMakeLists.txt
+++ b/src/fd-net-device/examples/CMakeLists.txt
@@ -18,26 +18,24 @@ build_lib_example(
     ${libapplications}
 )
 
-if(${ENABLE_REALTIME})
-  build_lib_example(
-    NAME realtime-dummy-network
-    SOURCE_FILES realtime-dummy-network.cc
-    LIBRARIES_TO_LINK
-      ${libfd-net-device}
-      ${libinternet}
-      ${libapplications}
-      ${libinternet-apps}
-  )
+build_lib_example(
+  NAME realtime-dummy-network
+  SOURCE_FILES realtime-dummy-network.cc
+  LIBRARIES_TO_LINK
+    ${libfd-net-device}
+    ${libinternet}
+    ${libapplications}
+    ${libinternet-apps}
+)
 
-  build_lib_example(
-    NAME realtime-fd2fd-onoff
-    SOURCE_FILES realtime-fd2fd-onoff.cc
-    LIBRARIES_TO_LINK
-      ${libfd-net-device}
-      ${libinternet}
-      ${libapplications}
-  )
-endif()
+build_lib_example(
+  NAME realtime-fd2fd-onoff
+  SOURCE_FILES realtime-fd2fd-onoff.cc
+  LIBRARIES_TO_LINK
+    ${libfd-net-device}
+    ${libinternet}
+    ${libapplications}
+)
 
 if(${ENABLE_EMU})
   build_lib_example(
diff --git a/src/tap-bridge/CMakeLists.txt b/src/tap-bridge/CMakeLists.txt
index f7e1f9ce7..a0aa5588c 100644
--- a/src/tap-bridge/CMakeLists.txt
+++ b/src/tap-bridge/CMakeLists.txt
@@ -1,11 +1,7 @@
-if((NOT
-    ${ENABLE_REALTIME})
-   OR (NOT
-       ${ENABLE_EMU})
-)
+if(NOT ${ENABLE_EMU})
   message(
     ${HIGHLIGHTED_STATUS}
-    "tap-bridge requires emulation and realtime features"
+    "tap-bridge requires emulation feature"
   )
   message(
     ${HIGHLIGHTED_STATUS}