# Zig build failed **URL:** \ **Category:** General\ **Tags:** challenge:http-server\ **Created:** [October 29, 2026, 11:38am UTC](https://forum.codecrafters.io/t/zig-build-failed/16349 "2026-10-29T11:38:18Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![dillonko](https://yyz1.discourse-cdn.com/flex003/user_avatar/forum.codecrafters.io/dillonko/32/29401_2.png) [@dillonko](https://forum.codecrafters.io/u/dillonko)\ **Post date:** [October 29, 2026, 11:38am UTC](https://forum.codecrafters.io/t/zig-build-failed/16349/1 "2026-10-29T11:38:18Z")
Hi All, I got the following error response. I looks like it’s failing because the build file can’t find the addPassthruArgs function or value. The only thing I can think if is that it is a version issue. I am using Zig version 0.16.0. the addPassthruArgs does not exist in the Run.zig file : ❯ ./your\_program.sh build.zig:31:12: error: no field or member function named ‘addPassthruArgs’ in ‘Build.Step.Run’ run\_cmd.addPassthruArgs(); ~~~^~~~~~~~~~~~ /usr/local/zig-x86\_64-linux-0.16.0/lib/std/Build/Step/Run.zig:1:1: note: struct declared here const Run = @This(); ^ ~~~~ build.zig:31:12: note: method invocation only supports up to one level of implicit pointer dereferencing build.zig:31:12: note: use ‘.\*’ to dereference pointer referenced by: runBuild\_\_anon\_34192: /usr/local/zig-x86\_64-linux-0.16.0/lib/std/Build.zig:2264:33 main: /usr/local/zig-x86\_64-linux-0.16.0/lib/compiler/build\_runner.zig:463:29 5 reference(s) hidden; use ‘-freference-trace=7’ to see all references Thanks in advance for any help! Dillon KO ---
**Author:** ![dillonko](https://yyz1.discourse-cdn.com/flex003/user_avatar/forum.codecrafters.io/dillonko/32/29401_2.png) [@dillonko](https://forum.codecrafters.io/u/dillonko)\ **Post date:** [October 29, 2026, 1:02pm UTC](https://forum.codecrafters.io/t/zig-build-failed/16349/3 "2026-10-29T13:02:38Z")
OK I was able to look at the code on a few sites and I had to modify the build file in order to make it work. Since I am on Zig version 0.16.0 and this seems to on 0.17.0. The subtle diffrence was that function. I had to also add the import builtin so I could detect the version. This is the following change I added: const builtin = @importimport(“builtin”); // added as line #2 I also added the following to replace line 33: if (comptime builtin.zig\_version.minor \>= 17) { run\_cmd.addPassthruArgs(); } else { if (b.args) |args| run\_cmd.addArgs(args); } This allowed for the app to run and then I got the follwing error. I think this part is expected and I need to add the needed code but just placing it here in case I am wrong: ❯ ./your\_program.sh Logs from your program will appear here! client connected!codecrafters-http-server-zig on  master [!] via ↯ v0.16.0 took 2m13s ❯ codecrafters submit Submitting changes (commit: 8d6b269)… ⚡ This is a turbo test run Running tests on your code. Logs should appear shortly… Detected changes to build.zig. Re-building… (this might take a while) [build] Starting build… [build] If you don’t see logs for 60s+, please contact us at hello@codecraft [build] Step 1 complete. [build] Step 2 complete. [build] Step 3 complete. [build] Step 4 complete. [build] Step 5 complete. [build] Step 6 complete. [build] Step 7 complete. [build] \> [auth] Started getting token authority from the client for registry-1.docker.i [build] \> [auth] Completed getting token authority from the client for registry-1.docker.i after 0.031s [build] Step 8 complete. [build] Step 9 complete. [build] Step 10 complete. [build] Step 11 complete. [build] Step 12 complete. [build] Step 13 complete. [build] Step 14 complete. [build] Step 15 complete. [build] Step 16 complete. [build] Step 17 complete. [build] Step 18 complete. [build] Step 19 complete. [build] Step 20 complete. [build] Step 21 complete. [build] Step 22 complete. [build] Step 23 complete. [build] Build successful. [compile] Moved ./.codecrafters/run.sh → ./your\_program.sh [compile] Compilation successful. [tester::#IA4] Running tests for Stage #IA4 (Respond with 200) [tester::#IA4] $ ./your\_program.sh [your\_program] Logs from your program will appear here! [tester::#IA4] $ curl -v [http://localhost:4221/](http://localhost:4221/) [your\_program] client connected! [tester::#IA4] Failed to read response: [tester::#IA4] Received: “” (no content received) [tester::#IA4] ^ error [tester::#IA4] Error: Expected: HTTP-version, Received: “” [tester::#IA4] Test failed View our article on debugging test failures: [How do I debug test failures? - CodeCrafters](https://codecrafters.io/debug) codecrafters-http-server-zig on  master via ↯ v0.16.0 took 2m30s Best, Dillon KO