# Problem: The ARMDLL environment variable is not set
**URL:** https://forum.sierrawireless.com/t/problem-the-armdll-environment-variable-is-not-set/151
**Category:** Development tools
**Created:** [November 25, 2005, 2:40pm UTC](https://forum.sierrawireless.com/t/problem-the-armdll-environment-variable-is-not-set/151 "2005-11-25T14:40:16Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@jiten9](https://forum.sierrawireless.com/u/jiten9)
#### Post date: [November 25, 2005, 2:40pm UTC](https://forum.sierrawireless.com/t/problem-the-armdll-environment-variable-is-not-set/151/1 "2005-11-25T14:40:16Z")
Hi,
While experimenting with install and unintall of OpenAT. I found a strange problem.
The reinstall of the Cygwin and OpentAT was normal but now when I Build my application I have problem
> [@](#):
>
> * * *
>
> Check environment settings…
>
> ```
> Launch a full library or binary process
>
> ```
>
> /cygdrive/F/OpenAT/V301/TgtGen/WmGen/mak/gen.mak:58: \*\*\* The ARMDLL environment variable is not set… Stop.
>
> ```
> Launch a full library or binary process
>
> ```
>
> /cygdrive/F/OpenAT/V301/TgtGen/WmGen/mak/gen.mak:58: \*\*\* The ARMDLL environment variable is not set… Stop.
>
> * * *
It gives me this error !
Do I have to make some setting for this … or I am missing something ??
Thanks,
Jiten.
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### Author:  [@OpenAT\_Fan](https://forum.sierrawireless.com/u/OpenAT_Fan)
#### Post date: [December 1, 2005, 8:05am UTC](https://forum.sierrawireless.com/t/problem-the-armdll-environment-variable-is-not-set/151/2 "2005-12-01T08:05:56Z")
Hi Jiten9,
This kind of error usually comes when ARM compiler is not installed on the system and you try to compile your OAT applicaton using ARM compiler. I experience similar problem when I tried to compile my OAT application with ARM compiler without having the ARM compiler itself.
You can try reinstalling ARM compiler again and then install Open-AT again.
I think this should help solving the problem.
Regards,
OpenAT Fan.