install path option

CMakeLists.txt

@@ -11,7 +11,14 @@ PROJECT(dynamixel)
 
 SET(EXECUTABLE_OUTPUT_PATH ${CMAKE_CURRENT_SOURCE_DIR}/bin)
 SET(LIBRARY_OUTPUT_PATH ${CMAKE_CURRENT_SOURCE_DIR}/lib)
-SET(CMAKE_INSTALL_PREFIX /usr/local)
+
+IF ("${INSTALL_DIR}" STREQUAL "")
+  MESSAGE ("[INSTALL] set install_dir to /usr/local")
+  SET(CMAKE_INSTALL_PREFIX /usr/local)
+ELSE ()
+  MESSAGE ("[INSTALL] set install_dir to input ${INSTALL_DIR}")
+  SET(CMAKE_INSTALL_PREFIX ${INSTALL_DIR})
+ENDIF ()
 
 IF (NOT CMAKE_BUILD_TYPE)
  SET(CMAKE_BUILD_TYPE "DEBUG")