cmake: add PYTHON_BUILD

python/CMakeLists.txt

@@ -45,6 +45,7 @@ SET(PYTHON_FILES
   )
 
 FOREACH(python ${PYTHON_FILES})
+  PYTHON_BUILD(${PROJECT_NAME} ${python})
   INSTALL(FILES
     "${CMAKE_CURRENT_SOURCE_DIR}/eigenpy/${python}"
     DESTINATION ${${PYWRAP}_INSTALL_DIR})