diff --git a/CMakeLists.txt b/CMakeLists.txt
index dd09a00..6dbb1de 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -36,33 +36,29 @@ if (OPTION_USE_NATSTEPFILTER)
     target_sources(option INTERFACE $<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}/debugger/option.natstepfilter>)
 endif()
 
-if (OPTION_INSTALL)
-    set(exclude_from_all EXCLUDE_FROM_ALL)
-endif()
-
-if (DEFINED OPTION_EXTRA_FLAGS)
-    separate_arguments(OPTION_EXTRA_FLAGS)
-    add_compile_options(${OPTION_EXTRA_FLAGS})
-    add_link_options(${OPTION_EXTRA_FLAGS})
-endif()
-
-if (OPTION_TEST)
-    add_subdirectory(test ${exclude_from_all})
-endif()
-
-if (OPTION_EXAMPLES)
-    add_subdirectory(examples ${exclude_from_all})
-endif()
-
-if (OPTION_BENCHMARK)
-    add_subdirectory(benchmark ${exclude_from_all})
-endif()
-
-if (OPTION_CODEGEN_TEST)
-    add_subdirectory(test/codegen ${exclude_from_all})
-endif()
-
-if (OPTION_INSTALL)
+if (NOT OPTION_INSTALL)
+    if (DEFINED OPTION_EXTRA_FLAGS)
+        separate_arguments(OPTION_EXTRA_FLAGS)
+        add_compile_options(${OPTION_EXTRA_FLAGS})
+        add_link_options(${OPTION_EXTRA_FLAGS})
+    endif()
+
+    if (OPTION_TEST)
+        add_subdirectory(test ${exclude_from_all})
+    endif()
+
+    if (OPTION_EXAMPLES)
+        add_subdirectory(examples ${exclude_from_all})
+    endif()
+
+    if (OPTION_BENCHMARK)
+        add_subdirectory(benchmark ${exclude_from_all})
+    endif()
+
+    if (OPTION_CODEGEN_TEST)
+        add_subdirectory(test/codegen ${exclude_from_all})
+    endif()
+else() # ^^^ NOT OPTION_INSTALL / vvv OPTION_INSTALL
     include(CMakePackageConfigHelpers)
     include(GNUInstallDirs)