Install guard (arun11299#93)

Author: SoraKatadzuma

CMakeLists.txt

@@ -4,13 +4,17 @@ project(subprocess VERSION 0.0.1 LANGUAGES CXX)
 set(CMAKE_CXX_STANDARD 11 CACHE STRING "C++ standard to use")
 option(EXPORT_COMPILE_COMMANDS "create clang compile database" ON)
 option(SUBPROCESS_TESTS "enable subprocess tests" OFF)
+option(SUBPROCESS_INSTALL "enable subprocess install" OFF)
 
 find_package(Threads REQUIRED)
 
 add_library(subprocess INTERFACE)
 target_link_libraries(subprocess INTERFACE Threads::Threads)
 target_include_directories(subprocess INTERFACE . )
-install(FILES subprocess.hpp DESTINATION include/cpp-subprocess/)
+
+if(SUBPROCESS_INSTALL)
+    install(FILES subprocess.hpp DESTINATION include/cpp-subprocess/)
+endif()
 
 if(SUBPROCESS_TESTS)
     include(CTest)