diff --git a/CMakeLists.txt b/CMakeLists.txt
index b2b1d56..9453ae4 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -5,7 +5,7 @@ cmake_minimum_required(VERSION 3.14 FATAL_ERROR)
 # Note: update this to your new project's name and version
 project(
   Greeter
-  VERSION 1.1
+  VERSION 1.0
   LANGUAGES CXX
 )
 
@@ -41,12 +41,11 @@ CPMAddPackage(
 # Note: If fmt is not imported, this is needed to prevent: CMake Error: install(EXPORT
 # "GreeterTargets" ...) includes target "Greeter" which requires target "fmt" that is not in any
 # export set.  see too https://gitlab.kitware.com/cmake/cmake/-/issues/15415
-set(FMT_VERSION 7.1.3)
 CPMAddPackage(
   NAME fmt
-  GIT_TAG ${FMT_VERSION}
-  GITHUB_REPOSITORY fmtlib/fmt
-  # XXX OPTION "FMT_INSTALL YES"
+  GIT_TAG 7.1.3
+  GITHUB_REPOSITORY fmtlib/fmt # to get an installable target
+                    OPTION "FMT_INSTALL YES"
 )
 
 # ---- Add source files ----
@@ -59,11 +58,11 @@ file(GLOB_RECURSE sources CONFIGURE_DEPENDS "${CMAKE_CURRENT_SOURCE_DIR}/source/
 # ---- Create library ----
 
 # Note: for header-only libraries change all PUBLIC flags to INTERFACE and create an interface
-# target: add_library(Greeter INTERFACE)
-add_library(Greeter)
-target_compile_features(Greeter PUBLIC cxx_std_17)
+# target! EITHER: add_library(Greeter INTERFACE) OR:
+add_library(Greeter ${headers} ${sources})
 
-target_sources(Greeter PRIVATE ${headers} ${sources})
+set_target_properties(Greeter PROPERTIES CXX_STANDARD ${CMAKE_CXX_STANDARD})
+# OR target_compile_features(Greeter PUBLIC cxx_std_17)
 
 # being a cross-platform target, we enforce standards conformance on MSVC
 if(MSVC)
@@ -94,5 +93,6 @@ packageProject(
   INCLUDE_DIR ${PROJECT_SOURCE_DIR}/include
   INCLUDE_DESTINATION include/${PROJECT_NAME}-${PROJECT_VERSION}
   VERSION_HEADER "${VERSION_HEADER_LOCATION}"
-  # XXX DEPENDENCIES "fmt ${FMT_VERSION}"
+  # TODO COMPATIBILITY SameMajorVersion
+  DEPENDENCIES "fmt 7.1.3"
 )
diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
index 8ba3a94..ff14a6f 100644
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -1,10 +1,6 @@
 cmake_minimum_required(VERSION 3.14 FATAL_ERROR)
 
-project(
-  GreeterTests
-  VERSION 1.1
-  LANGUAGES CXX
-)
+project(GreeterTests LANGUAGES CXX)
 
 # ---- Options ----
 
@@ -43,16 +39,16 @@ CPMAddPackage(
 
 file(GLOB sources CONFIGURE_DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/source/*.cpp)
 add_executable(GreeterTests ${sources})
-target_link_libraries(GreeterTests doctest Greeter::Greeter)
+target_link_libraries(GreeterTests doctest::doctest Greeter::Greeter)
 
 set_target_properties(GreeterTests PROPERTIES CXX_STANDARD 17)
 
 # enable compiler warnings
 if(NOT TEST_INSTALLED_VERSION)
   if(CMAKE_CXX_COMPILER_ID MATCHES "Clang" OR CMAKE_CXX_COMPILER_ID MATCHES "GNU")
-    target_compile_options(Greeter PRIVATE -Wall -pedantic -Wextra -Werror)
+    target_compile_options(Greeter PUBLIC -Wall -Wpedantic -Wextra -Werror)
   elseif(MSVC)
-    target_compile_options(Greeter PRIVATE /W4 /WX)
+    target_compile_options(Greeter PUBLIC /W4 /WX)
     target_compile_definitions(GreeterTests PUBLIC DOCTEST_CONFIG_USE_STD_HEADERS)
   endif()
 endif()
@@ -63,13 +59,16 @@ enable_testing()
 
 # Note: doctest and similar testing frameworks can automatically configure CMake tests For other
 # testing frameworks add the tests target instead:
-add_test(greeterTests GreeterTests)
-# include(${doctest_SOURCE_DIR}/scripts/cmake/doctest.cmake) doctest_discover_tests(GreeterTests)
-# Warning: if doctest is imported with find_package() this will fail! CK
+if(DEFINED doctest_SOURCE_DIR)
+  include(${doctest_SOURCE_DIR}/scripts/cmake/doctest.cmake)
+  doctest_discover_tests(GreeterTests)
+else()
+  add_test(greeterTests GreeterTests)
+endif()
 
 # ---- code coverage ----
 
-if(ENABLE_TEST_COVERAGE AND NOT TEST_INSTALLED_VERSION)
+if(ENABLE_TEST_COVERAGE)
   target_compile_options(Greeter PUBLIC -O0 -g -fprofile-arcs -ftest-coverage)
   target_link_options(Greeter PUBLIC -fprofile-arcs -ftest-coverage)
 endif()
diff --git a/test/source/greeter.cpp b/test/source/greeter.cpp
index 345ecf3..cab989b 100644
--- a/test/source/greeter.cpp
+++ b/test/source/greeter.cpp
@@ -16,8 +16,13 @@ TEST_CASE("Greeter") {
 }
 
 TEST_CASE("Greeter version") {
-  static_assert(std::string_view(GREETER_VERSION) == std::string_view("1.1"));
-  CHECK(std::string(GREETER_VERSION) == std::string("1.1"));
+#if (__cpp_lib_starts_ends_with)
+  static_assert(std::string_view(GREETER_VERSION).starts_with("1.0"));  // TBD C++20 only
+  CHECK(std::string(GREETER_VERSION).starts_with("1.0"));               // SameMajorVersion
+#else
+  static_assert(std::string_view(GREETER_VERSION) == std::string_view("1.0"));
+  CHECK(std::string(GREETER_VERSION) == std::string("1.0"));
+#endif
 }
 
 TEST_CASE("Greeter date") {