diff --git a/CMakeLists.txt b/CMakeLists.txt
index ea8a8e41d27..018d36cfd27 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -144,7 +144,7 @@ execute_process(
   COMMAND python -c "from distutils import sysconfig; print sysconfig.get_config_var(\"VERSION\")"
   OUTPUT_VARIABLE PYTHON_VERSION
   OUTPUT_STRIP_TRAILING_WHITESPACE)
-set(python_dist_pkg_dir ${CMAKE_INSTALL_PREFIX}/lib/python${PYTHON_VERSION}/dist-packages)
+set(python_dist_pkg_dir lib/python${PYTHON_VERSION}/dist-packages)
 
 configure_file(hrpsys-base.pc.in ${CMAKE_CURRENT_BINARY_DIR}/hrpsys-base.pc @ONLY)
 install(FILES
diff --git a/idl/CMakeLists.txt b/idl/CMakeLists.txt
index d161549336f..a301e091195 100644
--- a/idl/CMakeLists.txt
+++ b/idl/CMakeLists.txt
@@ -121,8 +121,8 @@ foreach(_idl_file ${openhrp_idl_files})
   endif()
 endforeach()
 
-install(CODE "execute_process(COMMAND omniidl -bpython -C${python_dist_pkg_dir}/hrpsys -I${OPENRTM_IDL_DIR} ${idl_files} WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR})")
-install(CODE "execute_process(COMMAND omniidl -bpython -C${python_dist_pkg_dir}/hrpsys -I${OPENRTM_IDL_DIR} ${openhrp_idl_files} WORKING_DIRECTORY ${OPENHRP_IDL_DIR}/OpenHRP)")
+install(CODE "execute_process(COMMAND omniidl -bpython -C\$ENV{DESTDIR}\${CMAKE_INSTALL_PREFIX}/${python_dist_pkg_dir}/hrpsys -I${OPENRTM_IDL_DIR} ${idl_files} WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR})")
+install(CODE "execute_process(COMMAND omniidl -bpython -C\$ENV{DESTDIR}\${CMAKE_INSTALL_PREFIX}/${python_dist_pkg_dir}/hrpsys -I${OPENRTM_IDL_DIR} ${openhrp_idl_files} WORKING_DIRECTORY ${OPENHRP_IDL_DIR}/OpenHRP)")
 install(CODE "execute_process(COMMAND python -m compileall . WORKING_DIRECTORY ${python_dist_pkg_dir}/hrpsys)")
 install(FILES ${headers} DESTINATION include/hrpsys/idl)
 install(FILES ${idl_files} DESTINATION share/hrpsys/idl)