Nixpkgs: building python37Packages.pwntools fails

[sivizius]

Describe the bug
building the package python37Packages.pwntools fails.

To Reproduce
Steps to reproduce the behavior:

1. NIX_PATH=nixpkgs=https://github.com/nixos/nixpkgs/archive/master.tar.gz nix-shell --pure -p python37Packages.pwntools
2. execute and wait

Expected behavior
Successfully building python37Packages.pwntools to be used.

Notify maintainers
Maintainer: @kristoff3r @bennofs

Metadata

 - system: `"x86_64-linux"`
 - host os: `Linux 5.7.7, NixOS, 20.09pre-git (Nightingale)`
 - multi-user?: `yes`
 - sandbox: `yes`
 - version: `nix-env (Nix) 2.3.7`
 - channels(root): `"nixos-20.09pre235279.5717d9d2f7c"`
 - channels(sivizius): `""`
 - nixpkgs: `/nix/store/sg3gjhyhpln88cavabdpgaf5lzgmdb9p-master.tar.gz`

Error

Executing pipInstallPhase
/build/pwntools-4.1.1/dist /build/pwntools-4.1.1
Processing ./pwntools-4.1.1-py3-none-any.whl
Requirement already satisfied: paramiko>=1.15.2 in /nix/store/j1blivjknjbfv64b9xrmdqc6ixsi8wph-python3.7-paramiko-2.7.1/lib/python3.7/site-packages (from pwntools==4.1.1) (2.7.1)
Requirement already satisfied: intervaltree>=3.0 in /nix/store/6b6gb0h4rn2xpzbjmlcbqfr7bfjr48l5-python3.7-intervaltree-3.0.2/lib/python3.7/site-packages (from pwntools==4.1.1) (3.0.2)
Requirement already satisfied: sortedcontainers in /nix/store/fx0711sjsfgi8hkbbgx4m2vrsvn9vrf1-python3.7-sortedcontainers-2.1.0/lib/python3.7/site-packages (from pwntools==4.1.1) (2.1.0)
Requirement already satisfied: mako>=1.0.0 in /nix/store/h4wsf9k21zxj54i7qk34ymn0vy2a0klg-python3.7-Mako-1.1.3/lib/python3.7/site-packages (from pwntools==4.1.1) (1.1.3)
Requirement already satisfied: pyserial>=2.7 in /nix/store/qh3ppb1zchsnkq6n7kzzsljxnk42z926-python3.7-pyserial-3.4/lib/python3.7/site-packages (from pwntools==4.1.1) (3.4)
ERROR: Could not find a version that satisfies the requirement unicorn<1.0.2rc4,>=1.0.2rc1 (from pwntools==4.1.1) (from versions: none)
ERROR: No matching distribution found for unicorn<1.0.2rc4,>=1.0.2rc1 (from pwntools==4.1.1)
builder for '/nix/store/i345wihy0ynj98igfq6hzjvhpfxd1jsw-python3.7-pwntools-4.1.1.drv' failed with exit code 1
error: build of '/nix/store/i345wihy0ynj98igfq6hzjvhpfxd1jsw-python3.7-pwntools-4.1.1.drv' failed

[prusnak]

Will be fixed via https://github.com/NixOS/nixpkgs/pull/93927

[kristoff3r]

lol, I didn't see this issue, I started fixing it today because I recently noticed it was broken as well :D