# Window demo npm install failed

**URL:** <https://mediasoup.discourse.group/t/window-demo-npm-install-failed/5209>\
**Category:** mediasoup-demo\
**Created:** [May 6, 2023, 9:41am UTC](https://mediasoup.discourse.group/t/window-demo-npm-install-failed/5209 "2023-05-06T09:41:09Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![AllenShen](https://yyz2.discourse-cdn.com/free1/user_avatar/mediasoup.discourse.group/allenshen/32/2185_2.png) [@AllenShen](https://mediasoup.discourse.group/u/AllenShen)\
**Post date:** [May 6, 2023, 9:41am UTC](https://mediasoup.discourse.group/t/window-demo-npm-install-failed/5209/1 "2023-05-06T09:41:09Z")

</div>

Hi,

I tried to use windows 11 & VS2022 to build the demo, but after npm install, it build failed.

Here is an build error “error C2371: ‘ssize\_t’: redefinition; different basic types”, it seems both usrsctplib\usrsctp.h and worker/include/common.cpp defines ssize\_t?

Could you please have a look of below log?

using npm@8.19.4  
using node@v16.20.0  
GNU Make 3.81

npm ERR! FAILED: mediasoup-worker.exe.p/src\_Worker.cpp.obj  
npm ERR! “cl” “-Imediasoup-worker.exe.p” “-I.” “-I…....” “-I…....\include” “-Isubprojects\abseil-cpp-20211102.0” “-I…....\subprojects\abseil-cpp-20211102.0” “-I…....\subprojects\openssl-3.0.7\include” “-I…....\subprojects\openssl-3.0.7\crypto” “-I…....\subprojects\openssl-3.0.7\crypto\modes” “-I…....\subprojects\openssl-3.0.7\crypto\ec\curve448” “-I…....\subprojects\openssl-3.0.7\crypto\ec\curve448\arch\_32” “-I…....\subprojects\openssl-3.0.7\providers\common\include” “-I…....\subprojects\openssl-3.0.7\providers\implementations\include” “-Isubprojects\openssl-3.0.7\generated-config\archs\VC-WIN32\no-asm” “-I…....\subprojects\openssl-3.0.7\generated-config\archs\VC-WIN32\no-asm” “-I…....\subprojects\openssl-3.0.7\generated-config\archs\VC-WIN32\no-asm\include” “-I…....\subprojects\openssl-3.0.7\generated-config\archs\VC-WIN32\no-asm\crypto” “-I…....\subprojects\openssl-3.0.7\generated-config\archs\VC-WIN32\no-asm\providers\common\include” “-I…....\subprojects\nlohmann\_json-3.10.5\single\_include” “-I…....\subprojects\libuv-v1.44.2\include” “-Isubprojects\libsrtp-2.5.0\include” “-I…....\subprojects\libsrtp-2.5.0\include” “-Isubprojects\usrsctp-4e06feb01cadcd127d119486b98a4bd3d64aa1e7\usrsctplib” “-I…....\subprojects\usrsctp-4e06feb01cadcd127d119486b98a4bd3d64aa1e7\usrsctplib” “-Isubprojects\usrsctp-4e06feb01cadcd127d119486b98a4bd3d64aa1e7\usrsctplib\netinet” “-I…....\subprojects\usrsctp-4e06feb01cadcd127d119486b98a4bd3d64aa1e7\usrsctplib\netinet” “-Isubprojects\usrsctp-4e06feb01cadcd127d119486b98a4bd3d64aa1e7\usrsctplib\netinet6” “-I…....\subprojects\usrsctp-4e06feb01cadcd127d119486b98a4bd3d64aa1e7\usrsctplib\netinet6” “-Ideps/libwebrtc” “-I…....\deps\libwebrtc” “-I…....\deps\libwebrtc\libwebrtc” “-I…....\subprojects\wingetopt-1.00\src” “-DNDEBUG” “/MD” “/nologo” “/showIncludes” “/utf-8” “/W2” “/EHsc” “/std:c++14” “/permissive-” “/O2” “/Gw” “-DMS\_LITTLE\_ENDIAN” “-DNOMINMAX” “-DWIN32\_LEAN\_AND\_MEAN” “-D\_CRT\_SECURE\_NO\_WARNINGS” “-D\_SCL\_SECURE\_NO\_WARNINGS” “-D\_ENABLE\_EXTENDED\_ALIGNED\_STORAGE” “-DMS\_EXECUTABLE” “/Fdmediasoup-worker.exe.p\src\_Worker.cpp.pdb” /Fomediasoup-worker.exe.p/src\_Worker.cpp.obj “/c” …/…/…/src/Worker.cpp  
npm ERR! C:\Users\zeiss\AppData\Local\npm-cache\_cacache\tmp\git-cloneOFfpLl\worker\include\RTC/RTCP/ReceiverReport.hpp(80): warning C4146: unary minus operator applied to unsigned type, result still unsigned  
npm ERR! C:\Users\zeiss\AppData\Local\npm-cache\_cacache\tmp\git-cloneOFfpLl\worker\include\RTC/RTCP/Sdes.hpp(35): warning C4200: nonstandard extension used: zero-sized array in struct/union  
npm ERR! C:\Users\zeiss\AppData\Local\npm-cache\_cacache\tmp\git-cloneOFfpLl\worker\include\RTC/RTCP/Sdes.hpp(35): note: This member will be ignored by a defaulted constructor or copy/move assignment operator  
npm ERR! …....\subprojects\usrsctp-4e06feb01cadcd127d119486b98a4bd3d64aa1e7\usrsctplib\usrsctp.h(79): error C2371: ‘ssize\_t’: redefinition; different basic types  
npm ERR! C:\Users\zeiss\AppData\Local\npm-cache\_cacache\tmp\git-cloneOFfpLl\worker\include\common.hpp(16): note: see declaration of ‘ssize\_t’  
npm ERR! C:\Users\zeiss\AppData\Local\npm-cache\_cacache\tmp\git-cloneOFfpLl\worker\include\RTC/RTCP/FeedbackRtpTransport.hpp(304): warning C4146: unary minus operator applied to unsigned type, result still unsigned  
npm ERR! …....\deps\libwebrtc\libwebrtc/modules/remote\_bitrate\_estimator/remote\_bitrate\_estimator\_abs\_send\_time.h(55): warning C4244: ‘return’: conversion from ‘float’ to ‘int’, possible loss of data  
npm ERR! …....\deps\libwebrtc\libwebrtc/modules/remote\_bitrate\_estimator/remote\_bitrate\_estimator\_abs\_send\_time.h(61): warning C4244: ‘return’: conversion from ‘float’ to ‘int’, possible loss of data  
npm ERR! [1165/1304] Compiling C++ object mediasoup-worker.exe.p/src\_DepLibUV.cpp.obj  
npm ERR! ninja: build stopped: subcommand failed.  
npm ERR! make: Leaving directory `/c/Users/zeiss/AppData/Local/npm-cache/\_cacache/tmp/git-cloneOFfpLl/worker’  
npm ERR! npm verb cli C:\Program Files\nodejs\node.exe C:\Users\zeiss\AppData\Roaming\nvm\v16.20.0\node\_modules\npm\bin\npm-cli.js  
npm ERR! npm info using npm@8.19.4  
npm ERR! npm info using node@v16.20.0