nix: build: Fix error message.

This fixes surprising error message like as follows,
which looks like an overlook:

@ unsupported-platform /gnu/store/4xb677bysagk7pl4xba9xz4gzwvsh0zn-guile-bootstrap-2.0.drv x86_64-gnu
while setting up the child process: in phase exec: a `x86_64-gnu' is required to build `x86_64-linux',
 but I am a `/gnu/store/4xb677bysagk7pl4xba9xz4gzwvsh0zn-guile-bootstrap-2.0.drv'

* nix/libstore/build.cc (execBuilderOrBuiltin):
  Fix the error message when canBuildLocally fails.

Fixes: 3af52f845fe2 ("[...] use std::format instead of boost::format.")
Merges: https://codeberg.org/guix/guix/pulls/10080
Signed-off-by: Nguyễn Gia Phong <cnx@loang.net>

1 files changed, 1 insertions, 1 deletions

diff --git a/nix/libstore/build.cc b/nix/libstore/build.cc
index b94bca5359a..3cd7926d750 100644
--- a/nix/libstore/build.cc
+++ b/nix/libstore/build.cc
@@ -2455,7 +2455,7 @@ void DerivationGoal::execBuilderOrBuiltin(SpawnContext & ctx)
         if (settings.printBuildTrace)
             printMsg(lvlError, std::format("@ unsupported-platform {} {}", drvPath, drv.platform));
         throw Error(std::format("a `{}' is required to build `{}', but I am a `{}'",
-                    drv.platform, settings.thisSystem, drvPath));
+                                drv.platform, drvPath, settings.thisSystem));
     }
 
     errno = error;