Efraim Flashner <efraim@flashner.co.il> writes:

> When using 'git-fetch' for the source, when a patch is applied part of
> the version number is truncated.
>
> The following derivations will be built:
>    /gnu/store/zsy0j8jfg4q4nz8xk5bpc3h5qrclm679-opencv-3.4.3-checkout.drv
>    /gnu/store/kadg4jnyar79mpz5bmmg4w3qgn0iy81r-opencv-3.4.tar.xz.drv

Fixed in 814e12dc87a191718374d811c0a3024d38dffcbb.