# Link issue in iOS
**URL:** https://qa.fmod.com/t/link-issue-in-ios/17941
**Category:** Unity
**Created:** [November 11, 2021, 8:15am UTC](https://qa.fmod.com/t/link-issue-in-ios/17941 "2021-11-11T08:15:26Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@vesoljc](https://qa.fmod.com/u/vesoljc)
#### Post date: [November 11, 2021, 8:15am UTC](https://qa.fmod.com/t/link-issue-in-ios/17941/1 "2021-11-11T08:15:26Z")
Hi, using FMOD 2.01.11 and Unity 2020.3.16f1. We have a bit of custom build process and I have to setup xcode project by hand. So, I added the libfmodstudiounitypluginL.a to additional linker flags, the library is found, however I’m getting linker errors:
Undefined symbols for architecture arm64:
“\_RegisterSuspendCallback”, referenced from:
\_RuntimeManager\_RegisterSuspendCallback\_m92B896BE61A1D1AD94FB4740EF918E6BBE629DAF in FMODUnity.o
(maybe you meant: \_RuntimeManager\_RegisterSuspendCallback\_m92B896BE61A1D1AD94FB4740EF918E6BBE629DAF)
“\_FmodUnityNativePluginInit”, referenced from:
\_PlatformIOS\_FmodUnityNativePluginInit\_mF67E34DCBDB31DD307300410F3164FA8B735AFC6 in FMODUnity.o
(maybe you meant: \_PlatformIOS\_FmodUnityNativePluginInit\_mF67E34DCBDB31DD307300410F3164FA8B735AFC6)
What am I missing?
---
### Author:  [@vesoljc](https://qa.fmod.com/u/vesoljc)
#### Post date: [November 11, 2021, 11:14am UTC](https://qa.fmod.com/t/link-issue-in-ios/17941/2 "2021-11-11T11:14:37Z")
Found it, need to manually add platform\_ios.mm and fmodplugins.cpp.