Hello,
Disclaimer: I have never used Nix
from the Nix to Debian phrasebook
( https://nixos.wiki/wiki/Nix_to_Debian_phrasebook )
I would try:
$ nix-env -qaP '.*libossp_uuid.*'
As an answer to your other question (is there another package system
managing dependencies available on Debian?), I have never used NetBSD
pkgsrc/pkg on Linux but it has long been possible. And pkgsrc used to be
a source package management system but its pkg binary package management
alter ego has been introduced since then. I am not absolutely positive
that pkg (binary) can be used on Linux, but I strongly suppose so.
how to use pkgsrc on linux:
https://wiki.netbsd.org/pkgsrc/how_to_use_pkgsrc_on_linux/
Using pkgsrc (binary and source):
http://netbsd.org/docs/pkgsrc/using.html
for example, pkgsrc has no libossp_uuid package but does have a
ossp_uuid one:
https://pkgsrc.se/devel/ossp-uuid
Perhaps others more knowledgeable in pkgsrc than me will chime in :-)
https://pkgsrc.se/devel/ossp-uuid