diff --git a/CMakeLists.txt b/CMakeLists.txt
index c3578fd..82b8fc1 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.14...3.19 FATAL_ERROR)
+cmake_minimum_required(VERSION 3.14...3.19)
 
 # ---- Project ----
 
@@ -38,15 +38,11 @@ CPMAddPackage(
   VERSION 1.4
 )
 
-find_package(fmt 6)
-if(NOT TARGET fmt::fmt-header-only)
-  # FIXME this add a target without namespace! CK
-  CPMAddPackage(
-    NAME fmt
-    GIT_TAG 7.1.3
-    GITHUB_REPOSITORY fmtlib/fmt
-  )
-endif()
+CPMAddPackage(
+  NAME fmt
+  GIT_TAG 7.1.3
+  GITHUB_REPOSITORY fmtlib/fmt
+)
 
 # ---- Add source files ----
 
@@ -70,7 +66,7 @@ target_sources(Greeter PRIVATE ${headers} ${sources})
 # FIXME target_compile_options(Greeter PUBLIC "$<$<BOOL:${MSVC}>:/permissive->")
 
 # Link dependencies (if required)
-target_link_libraries(Greeter PUBLIC fmt::fmt)
+target_link_libraries(Greeter PRIVATE fmt::fmt-header-only)
 
 target_include_directories(
   Greeter PUBLIC $<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}/include>
@@ -92,5 +88,5 @@ packageProject(
   INCLUDE_DIR ${PROJECT_SOURCE_DIR}/include
   INCLUDE_DESTINATION include/${PROJECT_NAME}-${PROJECT_VERSION}
   VERSION_HEADER "${VERSION_HEADER_LOCATION}"
-  DEPENDENCIES fmt
+  # XXX DEPENDENCIES fmt
 )
diff --git a/all/CMakeLists.txt b/all/CMakeLists.txt
index bf9e3f7..134350f 100644
--- a/all/CMakeLists.txt
+++ b/all/CMakeLists.txt
@@ -1,7 +1,7 @@
 # this script adds all subprojects to a single build to allow IDEs understand the full project
 # structure.
 
-cmake_minimum_required(VERSION 3.14...3.19 FATAL_ERROR)
+cmake_minimum_required(VERSION 3.14...3.19)
 
 project(BuildAll LANGUAGES CXX)
 
diff --git a/documentation/CMakeLists.txt b/documentation/CMakeLists.txt
index f4fd8a1..67794bf 100644
--- a/documentation/CMakeLists.txt
+++ b/documentation/CMakeLists.txt
@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.14...3.19 FATAL_ERROR)
+cmake_minimum_required(VERSION 3.14...3.19)
 
 project(GreeterDocs)
 
diff --git a/standalone/CMakeLists.txt b/standalone/CMakeLists.txt
index 4bb837d..f9ebecc 100644
--- a/standalone/CMakeLists.txt
+++ b/standalone/CMakeLists.txt
@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.14 FATAL_ERROR)
+cmake_minimum_required(VERSION 3.14...3.19)
 
 project(GreeterStandalone LANGUAGES CXX)
 
@@ -21,10 +21,11 @@ CPMAddPackage(NAME Greeter SOURCE_DIR ${CMAKE_CURRENT_LIST_DIR}/..)
 
 # ---- Create standalone executable ----
 
-file(GLOB sources CONFIGURE_DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/source/*.cpp)
+file(GLOB sources CONFIGURE_DEPENDS source/*.cpp)
 
 add_executable(GreeterStandalone ${sources})
 
-set_target_properties(GreeterStandalone PROPERTIES CXX_STANDARD 17 OUTPUT_NAME "Greeter")
+# FIXME: WHY? CK
+# set_target_properties(GreeterStandalone PROPERTIES CXX_STANDARD 17 OUTPUT_NAME "Greeter")
 
 target_link_libraries(GreeterStandalone Greeter::Greeter cxxopts)
diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
index 8cfc7ba..d6c6c7e 100644
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.14...3.19 FATAL_ERROR)
+cmake_minimum_required(VERSION 3.14...3.19)
 
 project(GreeterTests LANGUAGES CXX)
 
@@ -15,15 +15,11 @@ include(../cmake/tools.cmake)
 
 include(../cmake/CPM.cmake)
 
-find_package(doctest)
-if(NOT TARGET doctest::doctest)
-  # FIXME this add a target without namespace! CK
-  CPMAddPackage(
-    NAME doctest
-    GITHUB_REPOSITORY onqtam/doctest
-    GIT_TAG 2.3.7
-  )
-endif()
+CPMAddPackage(
+  NAME doctest
+  GITHUB_REPOSITORY onqtam/doctest
+  GIT_TAG 2.3.7
+)
 
 if(TEST_INSTALLED_VERSION)
   find_package(Greeter REQUIRED)
@@ -49,10 +45,10 @@ target_compile_features(GreeterTests PUBLIC cxx_std_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 PUBLIC -Wall -pedantic -Wextra -Werror)
+    target_compile_options(Greeter PRIVATE -Wall -pedantic -Wextra -Werror)
   elseif(MSVC)
-    target_compile_options(Greeter PUBLIC /W4 /WX)
-    target_compile_definitions(GreeterTests PUBLIC DOCTEST_CONFIG_USE_STD_HEADERS)
+    target_compile_options(Greeter PRIVATE /W4 /WX)
+    target_compile_definitions(GreeterTests PRIVATE DOCTEST_CONFIG_USE_STD_HEADERS)
   endif()
 endif()
 
@@ -70,6 +66,6 @@ add_test(NAME GreeterTests COMMAND GreeterTests --success=false)
 # ---- code coverage ----
 
 if(ENABLE_TEST_COVERAGE AND NOT TEST_INSTALLED_VERSION)
-  target_compile_options(Greeter PUBLIC -O0 -g -fprofile-arcs -ftest-coverage)
-  target_link_options(Greeter PUBLIC -fprofile-arcs -ftest-coverage)
+  target_compile_options(Greeter PRIVATE -O0 -g -fprofile-arcs -ftest-coverage)
+  target_link_options(Greeter PRIVATE -fprofile-arcs -ftest-coverage)
 endif()