Running nixpkgs-update (https://nix-community.org/update-bot/) with UPDATE_INFO: cvs-fast-export 1.63 -> 2.6 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..db71a86141ba 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 = "2.6";
 
   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-x2nHVKfQGOvYI2t26Mjc4muEH6J3M0SB1ZerR1fGx/U=";
   };
 
   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.
unpacking source archive /nix/store/1bnpl5d6k61zc92g88bdxd3g0r9dkrnc-cvs-fast-export-2.6.tar.gz
source root is cvs-fast-export-2.6
setting SOURCE_DATE_EPOCH to timestamp 1791327943 of file "cvs-fast-export-2.6/tests/vendorsplit.testrepo/module/z,v"
Running phase: patchPhase
@nix { "action": "setPhase", "phase": "patchPhase" }
patching script interpreter paths in .
./cvsstrip: interpreter directive changed from "#!/usr/bin/env python3" to "/nix/store/xahxrjs30p3mw0a42bqg9ikgkikskw8m-python3-3.14.8/bin/python3"
./buildprep: interpreter directive changed from "#!/bin/sh" to "/nix/store/nnm9gdr70ihc6zc9298mzz8jpcgaciql-bash-5.3p20/bin/sh"
./cvsconvert: interpreter directive changed from "#!/usr/bin/env python3" to "/nix/store/xahxrjs30p3mw0a42bqg9ikgkikskw8m-python3-3.14.8/bin/python3"
./tests/visualize: interpreter directive changed from "#!/bin/sh" to "/nix/store/nnm9gdr70ihc6zc9298mzz8jpcgaciql-bash-5.3p20/bin/sh"
./tests/tapdiffer: interpreter directive changed from "#! /bin/sh" to "/nix/store/nnm9gdr70ihc6zc9298mzz8jpcgaciql-bash-5.3p20/bin/sh"
./tests/fast-import-check: interpreter directive changed from "#!/bin/sh" to "/nix/store/nnm9gdr70ihc6zc9298mzz8jpcgaciql-bash-5.3p20/bin/sh"
./tests/t9601.py: interpreter directive changed from "#!/usr/bin/env python3" to "/nix/store/xahxrjs30p3mw0a42bqg9ikgkikskw8m-python3-3.14.8/bin/python3"
./tests/t9603.py: interpreter directive changed from "#!/usr/bin/env python3" to "/nix/store/xahxrjs30p3mw0a42bqg9ikgkikskw8m-python3-3.14.8/bin/python3"
./tests/tapview: interpreter directive changed from "#! /bin/sh" to "/nix/store/nnm9gdr70ihc6zc9298mzz8jpcgaciql-bash-5.3p20/bin/sh"
./tests/t9602.py: interpreter directive changed from "#!/usr/bin/env python3" to "/nix/store/xahxrjs30p3mw0a42bqg9ikgkikskw8m-python3-3.14.8/bin/python3"
./tests/incremental.sh: interpreter directive changed from "#!/bin/sh" to "/nix/store/nnm9gdr70ihc6zc9298mzz8jpcgaciql-bash-5.3p20/bin/sh"
./tests/parsedate.py: interpreter directive changed from "#!/usr/bin/env python3" to "/nix/store/xahxrjs30p3mw0a42bqg9ikgkikskw8m-python3-3.14.8/bin/python3"
./cvssync: interpreter directive changed from "#!/usr/bin/python3" to "/nix/store/xahxrjs30p3mw0a42bqg9ikgkikskw8m-python3-3.14.8/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/nnm9gdr70ihc6zc9298mzz8jpcgaciql-bash-5.3p20/bin/bash XML_CATALOG_FILES=/nix/store/pdg81zdpvd058yvinpdblg916pifpwg6-docbook-xml-4.5/xml/dtd/docbook/catalog.xml\ /nix/store/s5r0dak2i66w3d85y3bi5s6k8qfpn6x3-docbook-xsl-nons-1.79.2/xml/xsl/docbook/catalog.xml LIBS= prefix=/nix/store/bfgm8377yliz5rix00lswka460kwf5kj-cvs-fast-export-2.6
go build -ldflags='-X main.version=2.6' -o cvs-fast-export cvs-fast-export.go
/nix/store/nnm9gdr70ihc6zc9298mzz8jpcgaciql-bash-5.3p20/bin/bash: line 1: go: command not found
make: *** [Makefile:43: cvs-fast-export] Error 127