Running nixpkgs-update (https://nix-community.org/update-bot/) with UPDATE_INFO: cvs-fast-export 1.63 -> 2.0 https://repology.org/project/cvs-fast-export/versions
attrpath: cvs-fast-export
Checking auto update branch...
No auto update branch exists
[version] 
[version] updated version and sha256
[rustCrateVersion] 
[rustCrateVersion] No cargoHash found
[golangModuleVersion] 
[golangModuleVersion] Not a buildGoModule package with vendorHash
[npmDepsVersion] 
[npmDepsVersion] No npmDepsHash
[updateScript] 
[updateScript] skipping because derivation has no updateScript
Diff after rewrites:
diff --git a/pkgs/by-name/cv/cvs-fast-export/package.nix b/pkgs/by-name/cv/cvs-fast-export/package.nix
index 07338a107e3d..176bb84b5bd2 100644
--- a/pkgs/by-name/cv/cvs-fast-export/package.nix
+++ b/pkgs/by-name/cv/cvs-fast-export/package.nix
@@ -17,11 +17,11 @@
 
 stdenv.mkDerivation (finalAttrs: {
   pname = "cvs-fast-export";
-  version = "1.63";
+  version = "2.0";
 
   src = fetchurl {
     url = "http://www.catb.org/~esr/cvs-fast-export/cvs-fast-export-${finalAttrs.version}.tar.gz";
-    sha256 = "sha256-YZF2QebWbvn/N9pLpccudZsFHzocJp/3M0Gx9p7fQ5Y=";
+    sha256 = "sha256-Y57uFauOvdqaUAm1OQ4JU97jlgbyiePpBZrl1M+N/3E=";
   };
 
   strictDeps = true;

Received ExitFailure 1 when running
Raw command: nix-build --option sandbox true --arg config "{ allowUnfree = true; allowAliases = false; }" --arg overlays "[ ]" -A cvs-fast-export
nix build failed.
got build log for 'cvs-fast-export' from 'daemon'
Running phase: unpackPhase
@nix { "action": "setPhase", "phase": "unpackPhase" }
unpacking source archive /nix/store/idmxm8x4h8q1fymc9nk98dzn1cshk1yn-cvs-fast-export-2.0.tar.gz
source root is cvs-fast-export-2.0
setting SOURCE_DATE_EPOCH to timestamp 1771335552 of file "cvs-fast-export-2.0/tests/visualize"
Running phase: patchPhase
@nix { "action": "setPhase", "phase": "patchPhase" }
patching script interpreter paths in .
./cvssync: interpreter directive changed from "#!/usr/bin/python3" to "/nix/store/slhpx9glq7vl99bwi93bgrhn3syv98s1-python3-3.13.11/bin/python3"
./buildprep: interpreter directive changed from "#!/bin/sh" to "/nix/store/f15k3dpilmiyv6zgpib289rnjykgr1r4-bash-5.3p9/bin/sh"
./tests/tapdiffer: interpreter directive changed from "#! /bin/sh" to "/nix/store/f15k3dpilmiyv6zgpib289rnjykgr1r4-bash-5.3p9/bin/sh"
./tests/visualize: interpreter directive changed from "#!/bin/sh" to "/nix/store/f15k3dpilmiyv6zgpib289rnjykgr1r4-bash-5.3p9/bin/sh"
./tests/t9603.py: interpreter directive changed from "#!/usr/bin/env python3" to "/nix/store/slhpx9glq7vl99bwi93bgrhn3syv98s1-python3-3.13.11/bin/python3"
./tests/t9602.py: interpreter directive changed from "#!/usr/bin/env python3" to "/nix/store/slhpx9glq7vl99bwi93bgrhn3syv98s1-python3-3.13.11/bin/python3"
./tests/t9601.py: interpreter directive changed from "#!/usr/bin/env python3" to "/nix/store/slhpx9glq7vl99bwi93bgrhn3syv98s1-python3-3.13.11/bin/python3"
./tests/parsedate.py: interpreter directive changed from "#!/usr/bin/env python3" to "/nix/store/slhpx9glq7vl99bwi93bgrhn3syv98s1-python3-3.13.11/bin/python3"
./tests/incremental.sh: interpreter directive changed from "#!/bin/sh" to "/nix/store/f15k3dpilmiyv6zgpib289rnjykgr1r4-bash-5.3p9/bin/sh"
./tests/tapview: interpreter directive changed from "#! /bin/sh" to "/nix/store/f15k3dpilmiyv6zgpib289rnjykgr1r4-bash-5.3p9/bin/sh"
./cvsconvert: interpreter directive changed from "#!/usr/bin/env python3" to "/nix/store/slhpx9glq7vl99bwi93bgrhn3syv98s1-python3-3.13.11/bin/python3"
./cvsstrip: interpreter directive changed from "#!/usr/bin/env python3" to "/nix/store/slhpx9glq7vl99bwi93bgrhn3syv98s1-python3-3.13.11/bin/python3"
Running phase: updateAutotoolsGnuConfigScriptsPhase
@nix { "action": "setPhase", "phase": "updateAutotoolsGnuConfigScriptsPhase" }
Running phase: configurePhase
@nix { "action": "setPhase", "phase": "configurePhase" }
no configure script, doing nothing
Running phase: buildPhase
@nix { "action": "setPhase", "phase": "buildPhase" }
build flags: SHELL=/nix/store/f15k3dpilmiyv6zgpib289rnjykgr1r4-bash-5.3p9/bin/bash XML_CATALOG_FILES=/nix/store/2phfc79fw8z6xm4l02dcamsajf24bfcl-docbook-xml-4.5/xml/dtd/docbook/catalog.xml\ /nix/store/v23fmf2jrcihx7q2mxbpn6ppll10dgzf-docbook-xsl-nons-1.79.2/xml/xsl/docbook/catalog.xml LIBS= prefix=/nix/store/wfb35c5a93s1ibbcxyb0wd01mb06xli6-cvs-fast-export-2.0
make: *** No rule to make target 'go.mod', needed by 'cvs-fast-export'.  Stop.