# Announcing ncps: A Nix Cache Proxy Server for Faster Builds!

**URL:** https://discourse.nixos.org/t/announcing-ncps-a-nix-cache-proxy-server-for-faster-builds/58166
**Category:** Announcements
**Created:** [January 1, 2025, 9:08pm UTC](https://discourse.nixos.org/t/announcing-ncps-a-nix-cache-proxy-server-for-faster-builds/58166 "2025-01-01T21:08:13Z")
**Posts on this page:** 1
**Showing post:** 18

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### Author: ![ruffsl](https://discourse.nixos.org/user_avatar/discourse.nixos.org/ruffsl/32/15715_2.png) [@ruffsl](https://discourse.nixos.org/u/ruffsl)
#### Post date: [September 3, 2025, 1:11am UTC](https://discourse.nixos.org/t/announcing-ncps-a-nix-cache-proxy-server-for-faster-builds/58166/18 "2025-09-03T01:11:09Z")

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Looks like that PR has since stalled out, and @philipwilk has now picked up the torch! Although they could use some help with patching nix for system wide testing and dogfooding:

> <https://github.com/NixOS/nix/pull/13301#issuecomment-3240470833>
>
> Took another look just now and i think switching the for loops around in \`Store:…:querySubstitutablePathInfos\` is enough to fix it, it seemed to work when i pulled in packages by running \`nix shell nixpkgs#(name)\` in the installPhase environment, but I'm struggling a bit to figure out how to patch nix post 2.26 so I can test it on my whole system in different situations.
> 
> \<details\>
> \<summary\>I've tried using this overlay that recompiles but doesnt seem to actually apply the patch\</summary\>
> 
> nix reports its version as \`nix (Nix) 2.30.2+1\` but it definitely hasn't applied my patch because it isn't behaving like the installPhase version is.
> 
> \`\`\`nix
> (final: prev: {
> nixVersions = prev.nixVersions.extend (
> finalNixV: prevNixV: {
> nixComponents\_2\_30 =
> (prevNixV.nixComponents\_2\_30.overrideScope (
> finalScope: prevScope: {
> aws-sdk-cpp = null;
> withAWS = false;
> }
> )).appendPatches
> \[./ffb2ee8eefc9946a8ebb406cb1fe02734549406d.patch \];
> }
> );
> })
> \`\`\`
> \</details\>

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