5 files changed, 24 insertions, 30 deletions
diff --git a/Help/guide/tutorial/Step6/CMakeLists.txt b/Help/guide/tutorial/Step6/CMakeLists.txt
index 1465e46..c3b375a 100644
--- a/Help/guide/tutorial/Step6/CMakeLists.txt
+++ b/Help/guide/tutorial/Step6/CMakeLists.txt
@@ -1,30 +1,20 @@
-cmake_minimum_required(VERSION 3.3)
-project(Tutorial)
+cmake_minimum_required(VERSION 3.10)
 
+# set the project name and version
+project(Tutorial VERSION 1.0)
+
+# specify the C++ standard
 set(CMAKE_CXX_STANDARD 11)
 set(CMAKE_CXX_STANDARD_REQUIRED True)
 
-# set the version number
-set(Tutorial_VERSION_MAJOR 1)
-set(Tutorial_VERSION_MINOR 0)
-
-# does this system provide the log and exp functions?
-include(CheckSymbolExists)
-set(CMAKE_REQUIRED_LIBRARIES "m")
-check_symbol_exists(log "math.h" HAVE_LOG)
-check_symbol_exists(exp "math.h" HAVE_EXP)
-
 # should we use our own math functions
 option(USE_MYMATH "Use tutorial provided math implementation" ON)
 
 # configure a header file to pass some of the CMake settings
 # to the source code
-configure_file(
-  "${PROJECT_SOURCE_DIR}/TutorialConfig.h.in"
-  "${PROJECT_BINARY_DIR}/TutorialConfig.h"
-  )
+configure_file(TutorialConfig.h.in TutorialConfig.h)
 
-# add the MathFunctions library?
+# add the MathFunctions library
 if(USE_MYMATH)
   add_subdirectory(MathFunctions)
   list(APPEND EXTRA_LIBS MathFunctions)
diff --git a/Help/guide/tutorial/Step6/MathFunctions/CMakeLists.txt b/Help/guide/tutorial/Step6/MathFunctions/CMakeLists.txt
index def1140..4bf6024 100644
--- a/Help/guide/tutorial/Step6/MathFunctions/CMakeLists.txt
+++ b/Help/guide/tutorial/Step6/MathFunctions/CMakeLists.txt
@@ -2,13 +2,21 @@ add_library(MathFunctions mysqrt.cxx)
 
 # state that anybody linking to us needs to include the current source dir
 # to find MathFunctions.h, while we don't.
-# state that we depend on Tutorial_BINARY_DIR but consumers don't, as the
-# TutorialConfig.h include is an implementation detail
 target_include_directories(MathFunctions
           INTERFACE ${CMAKE_CURRENT_SOURCE_DIR}
-          PRIVATE ${Tutorial_BINARY_DIR}
           )
 
+# does this system provide the log and exp functions?
+include(CheckSymbolExists)
+set(CMAKE_REQUIRED_LIBRARIES "m")
+check_symbol_exists(log "math.h" HAVE_LOG)
+check_symbol_exists(exp "math.h" HAVE_EXP)
+
+if(HAVE_LOG AND HAVE_EXP)
+  target_compile_definitions(MathFunctions
+                             PRIVATE "HAVE_LOG" "HAVE_EXP")
+endif()
+
 # install rules
 install(TARGETS MathFunctions DESTINATION lib)
 install(FILES MathFunctions.h DESTINATION include)
diff --git a/Help/guide/tutorial/Step6/MathFunctions/mysqrt.cxx b/Help/guide/tutorial/Step6/MathFunctions/mysqrt.cxx
index b9ad20a..3f23245 100644
--- a/Help/guide/tutorial/Step6/MathFunctions/mysqrt.cxx
+++ b/Help/guide/tutorial/Step6/MathFunctions/mysqrt.cxx
@@ -1,5 +1,4 @@
 #include "MathFunctions.h"
-#include "TutorialConfig.h"
 #include <iostream>
 
 #include <cmath>
@@ -14,8 +13,8 @@ double mysqrt(double x)
   // if we have both log and exp then use them
 #if defined(HAVE_LOG) && defined(HAVE_EXP)
   double result = exp(log(x) * 0.5);
-  std::cout << "Computing sqrt of " << x << " to be " << result << " using log"
-            << std::endl;
+  std::cout << "Computing sqrt of " << x << " to be " << result
+            << " using log and exp" << std::endl;
 #else
   double result = x;
 
diff --git a/Help/guide/tutorial/Step6/TutorialConfig.h.in b/Help/guide/tutorial/Step6/TutorialConfig.h.in
index e97ce24..e23f521 100644
--- a/Help/guide/tutorial/Step6/TutorialConfig.h.in
+++ b/Help/guide/tutorial/Step6/TutorialConfig.h.in
@@ -2,7 +2,3 @@
 #define Tutorial_VERSION_MAJOR @Tutorial_VERSION_MAJOR@
 #define Tutorial_VERSION_MINOR @Tutorial_VERSION_MINOR@
 #cmakedefine USE_MYMATH
-
-// does the platform provide exp and log functions?
-#cmakedefine HAVE_LOG
-#cmakedefine HAVE_EXP
diff --git a/Help/guide/tutorial/Step6/tutorial.cxx b/Help/guide/tutorial/Step6/tutorial.cxx
index 8156a9c..b3c6a4f 100644
--- a/Help/guide/tutorial/Step6/tutorial.cxx
+++ b/Help/guide/tutorial/Step6/tutorial.cxx
@@ -20,13 +20,14 @@ int main(int argc, char* argv[])
     return 1;
   }
 
-  double inputValue = std::stod(argv[1]);
+  // convert input to double
+  const double inputValue = std::stod(argv[1]);
 
   // which square root function should we use?
 #ifdef USE_MYMATH
-  double outputValue = mysqrt(inputValue);
+  const double outputValue = mysqrt(inputValue);
 #else
-  double outputValue = sqrt(inputValue);
+  const double outputValue = sqrt(inputValue);
 #endif
 
   std::cout << "The square root of " << inputValue << " is " << outputValue