No boost

example/CMakeLists.txt

@@ -19,20 +19,11 @@ rv3_add_test(example.accumulate_ints accumulate_ints accumulate_ints.cpp)
 rv3_add_test(example.comprehension_conversion comprehension_conversion comprehension_conversion.cpp)
 rv3_add_test(example.sort_unique sort_unique sort_unique.cpp)
 
-# Guarded with a variable because the calendar example causes gcc to puke.
+# Guarded with a variable because the calendar example causes MSVC to puke.
 if(RANGES_BUILD_CALENDAR_EXAMPLE)
-    set(Boost_USE_STATIC_LIBS        ON)
-    set(Boost_USE_MULTITHREADED     OFF)
-    set(Boost_USE_STATIC_RUNTIME    OFF)
-    find_package(Boost 1.59.0 COMPONENTS date_time program_options)
-
-    if (Boost_FOUND)
-        add_executable(calendar calendar.cpp)
-        target_include_directories(calendar SYSTEM PRIVATE ${Boost_INCLUDE_DIRS})
-        target_link_libraries(calendar range-v3 ${Boost_LIBRARIES})
-        message(STATUS "boost: ${Boost_LIBRARY_DIRS}")
-        target_compile_definitions(calendar PRIVATE BOOST_NO_AUTO_PTR)
-        target_compile_options(calendar PRIVATE -std=gnu++14)
-        set_target_properties(calendar PROPERTIES LINK_FLAGS "-L${Boost_LIBRARY_DIRS}")
-    endif()
+  add_executable(calendar calendar.cpp date.h)
+  target_link_libraries(calendar range-v3)
+  if( MSVC )
+    target_compile_options(calendar PRIVATE /experimental:preprocessor)
+  endif( )
 endif()