Problem: Examples are not compiled

Solution: Compile the examples when tests are compiled and using C++11
or greater.

examples/CMakeLists.txt

@@ -0,0 +1,23 @@
+cmake_minimum_required(VERSION 3.0 FATAL_ERROR)
+
+project(cppzmq-examples CXX)
+
+# place binaries and libraries according to GNU standards
+
+include(GNUInstallDirs)
+set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/${CMAKE_INSTALL_LIBDIR})
+set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/${CMAKE_INSTALL_LIBDIR})
+set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/${CMAKE_INSTALL_BINDIR})
+
+find_package(Threads)
+
+add_executable(
+    pubsub_multithread_inproc
+    pubsub_multithread_inproc.cpp
+)
+
+target_link_libraries(
+    pubsub_multithread_inproc
+    PRIVATE cppzmq
+    PRIVATE ${CMAKE_THREAD_LIBS_INIT}
+)