windows下编译node提示： ctrpp not found in WinSDK path–using pre-gen files from tools/msvs/ge { ‘target_defaults’: { ‘cflags’: [], ‘default_configuration’: ‘Release’, ‘defines’: [], ‘include_dirs’: [], ‘libraries’: []}, ‘variables’: { ‘clang’: 0, ‘host_arch’: ‘ia32’, ‘node_install_npm’: ‘true’, ‘node_prefix’: ‘’, ‘node_shared_cares’: ‘false’, ‘node_shared_http_parser’: ‘false’, ‘node_shared_libuv’: ‘false’, ‘node_shared_openssl’: ‘false’, ‘node_shared_v8’: ‘false’, ‘node_shared_zlib’: ‘false’, ‘node_tag’: ‘’, ‘node_unsafe_optimizations’: 0, ‘node_use_dtrace’: ‘false’, ‘node_use_etw’: ‘true’, ‘node_use_openssl’: ‘true’, ‘node_use_perfctr’: ‘true’, ‘node_use_systemtap’: ‘false’, ‘python’: ‘C:\Python27\python.exe’, ‘target_arch’: ‘ia32’, ‘v8_enable_gdbjit’: 0, ‘v8_no_strict_aliasing’: 1, ‘v8_use_snapshot’: ‘true’, ‘visibility’: ‘’}} creating config.gypi creating config.mk Project files generated. Build skipped. To build, this file needs to run from VS cmd prompt.

已经安装python，visual studio2012 为什么无法安装，提示信息具体要怎么解决，谢谢。。