I think you can for gaia/apps.  There's the build variable "APP=".

See
https://developer.mozilla.org/en-US/Firefox_OS/Developing_Gaia/make_options_reference#Build_specific_apps

If you're looking for more of folder changes, etc:
https://developer.mozilla.org/en-US/Firefox_OS/Developing_Gaia/Customizing_build-time_apps

I'm not sure about gecko.

On Wed, Aug 26, 2015 at 5:42 PM, <inblevisi...@gmail.com> wrote:

> Hi all:
>
> I was just wondering if I can build and flash only a specific file/folder
> which I changed in gecko and gaia folders.
>
> to be specific, inside:
> gecko/dom/
> gaia/apps/
>
> Because, sometimes building does not go through and gives me errors and
> then I do it again - it works fine. But it takes really long time to build
> the code and I just have to wait till its done.
>
> We are just making small changes to the files to log some data and don't
> want to just build complete gecko or gaia folders so many times a day.
>
>
> Thanks.
>
>
>
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