darwin libc not available during cImport

[haze]

Zig Version

0.10.0-dev.2122+f161d3875

Steps to Reproduce

 cakewalk % head -n 10 src/main.zig                                                                                                                         ~/code/cakewalk
pub const clang = @cImport({
    @cInclude("clang-c/Index.h");
});

const std = @import("std");
const out = std.log.scoped(.cakewalk);
const ast = @import("ast.zig");
const ClassMethod = @import("Method.zig");

// NOTE(haze): @properties => setters & getters
 cakewalk % cat build.zig                                                                                                                                   ~/code/cakewalk
const std = @import("std");

pub fn build(b: *std.build.Builder) void {
    // Standard target options allows the person running `zig build` to choose
    // what target to build for. Here we do not override the defaults, which
    // means any target is allowed, and the default is native. Other options
    // for restricting supported target set are available.
    const target = b.standardTargetOptions(.{});

    // Standard release options allow the person running `zig build` to select
    // between Debug, ReleaseSafe, ReleaseFast, and ReleaseSmall.
    const mode = b.standardReleaseOptions();

    const exe = b.addExecutable("cakewalk", "src/main.zig");
    exe.addIncludePath("/nix/store/hpk7m3zqrlfsmzhhg6yyyqjs6v5bsgfg-clang-14.0.1-dev/include");
    exe.linkSystemLibraryName("clang");
    exe.setTarget(target);
    exe.setBuildMode(mode);
    exe.install();
    exe.linkLibC();

    const run_cmd = exe.run();
    run_cmd.step.dependOn(b.getInstallStep());
    if (b.args) |args| {
        run_cmd.addArgs(args);
    }

    const run_step = b.step("run", "Run the app");
    run_step.dependOn(&run_cmd.step);

    const exe_tests = b.addTest("src/main.zig");
    exe_tests.setTarget(target);
    exe_tests.setBuildMode(mode);

    const test_step = b.step("test", "Run unit tests");
    test_step.dependOn(&exe_tests.step);
}
 cakewalk % zig build --verbose-cc run                                                                                                                      ~/code/cakewalk
warning: Unrecognized C flag from NIX_CFLAGS_COMPILE: -iframework
warning: Unrecognized C flag from NIX_CFLAGS_COMPILE: /nix/store/lfv6d9007cp44ir53akdpgj4369l8j0v-apple-framework-CoreFoundation-11.0.0/Library/Frameworks
warning: Unrecognized C flag from NIX_CFLAGS_COMPILE: -iframework
warning: Unrecognized C flag from NIX_CFLAGS_COMPILE: /nix/store/lfv6d9007cp44ir53akdpgj4369l8j0v-apple-framework-CoreFoundation-11.0.0/Library/Frameworks
 -x c -fno-caret-diagnostics -target aarch64-unknown-macosx-gnu -nostdinc -fno-spell-checking -isystem /Users/haze/Code/zig/lib/include -Xclang -target-cpu -Xclang apple-a14 -Xclang -target-feature -Xclang -a65 -Xclang -target-feature -Xclang -a76 -Xclang -target-feature -Xclang +aes -Xclang -target-feature -Xclang +aggressive-fma -Xclang -target-feature -Xclang +alternate-sextload-cvt-f32-pattern -Xclang -target-feature -Xclang +altnzcv -Xclang -target-feature -Xclang +am -Xclang -target-feature -Xclang -amvs -Xclang -target-feature -Xclang -apple-a12 -Xclang -target-feature -Xclang -apple-a13 -Xclang -target-feature -Xclang -apple-a7 -Xclang -target-feature -Xclang +arith-bcc-fusion -Xclang -target-feature -Xclang +arith-cbz-fusion -Xclang -target-feature -Xclang -balance-fp-ops -Xclang -target-feature -Xclang -bf16 -Xclang -target-feature -Xclang -brbe -Xclang -target-feature -Xclang -bti -Xclang -target-feature -Xclang -call-saved-x10 -Xclang -target-feature -Xclang -call-saved-x11 -Xclang -target-feature -Xclang -call-saved-x12 -Xclang -target-feature -Xclang -call-saved-x13 -Xclang -target-feature -Xclang -call-saved-x14 -Xclang -target-feature -Xclang -call-saved-x15 -Xclang -target-feature -Xclang -call-saved-x18 -Xclang -target-feature -Xclang -call-saved-x8 -Xclang -target-feature -Xclang -call-saved-x9 -Xclang -target-feature -Xclang +ccdp -Xclang -target-feature -Xclang +ccidx -Xclang -target-feature -Xclang +ccpp -Xclang -target-feature -Xclang -cmp-bcc-fusion -Xclang -target-feature -Xclang +complxnum -Xclang -target-feature -Xclang +CONTEXTIDREL2 -Xclang -target-feature -Xclang -cortex-a78c -Xclang -target-feature -Xclang -cortex-r82 -Xclang -target-feature -Xclang +crc -Xclang -target-feature -Xclang +crypto -Xclang -target-feature -Xclang -custom-cheap-as-move -Xclang -target-feature -Xclang +disable-latency-sched-heuristic -Xclang -target-feature -Xclang +dit -Xclang -target-feature -Xclang +dotprod -Xclang -target-feature -Xclang -ecv -Xclang -target-feature -Xclang -ete -Xclang -target-feature -Xclang -exynos-cheap-as-move -Xclang -target-feature -Xclang -exynosm4 -Xclang -target-feature -Xclang -f32mm -Xclang -target-feature -Xclang -f64mm -Xclang -target-feature -Xclang -fgt -Xclang -target-feature -Xclang +flagm -Xclang -target-feature -Xclang -force-32bit-jump-tables -Xclang -target-feature -Xclang +fp16fml -Xclang -target-feature -Xclang +fp-armv8 -Xclang -target-feature -Xclang +fptoint -Xclang -target-feature -Xclang +fullfp16 -Xclang -target-feature -Xclang +fuse-address -Xclang -target-feature -Xclang +fuse-aes -Xclang -target-feature -Xclang +fuse-arith-logic -Xclang -target-feature -Xclang +fuse-crypto-eor -Xclang -target-feature -Xclang +fuse-csel -Xclang -target-feature -Xclang +fuse-literals -Xclang -target-feature -Xclang -harden-sls-blr -Xclang -target-feature -Xclang -harden-sls-nocomdat -Xclang -target-feature -Xclang -harden-sls-retbr -Xclang -target-feature -Xclang -hcx -Xclang -target-feature -Xclang 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-target-feature -Xclang -v8.6a -Xclang -target-feature -Xclang -v8.7a -Xclang -target-feature -Xclang -v8r -Xclang -target-feature -Xclang +vh -Xclang -target-feature -Xclang -wfxt -Xclang -target-feature -Xclang -xs -Xclang -target-feature -Xclang +zcm -Xclang -target-feature -Xclang +zcz -Xclang -target-feature -Xclang -zcz-fp-workaround -Xclang -target-feature -Xclang +zcz-gp -mmacos-version-min=12.3.1 -g -fsanitize=undefined -fsanitize-trap=undefined -mred-zone -fno-omit-frame-pointer -D_DEBUG -Og -fstack-protector-strong --param ssp-buffer-size=4 -fPIC -fno-unwind-tables -MD -MV -MF /Users/haze/Code/cakewalk/zig-cache/o/5631d7c3def33ffdb9b4f1857468d0c0/cimport.h.d -I /nix/store/hpk7m3zqrlfsmzhhg6yyyqjs6v5bsgfg-clang-14.0.1-dev/include -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX12.3.sdk -iwithsysroot /nix/store/hpk7m3zqrlfsmzhhg6yyyqjs6v5bsgfg-clang-14.0.1-dev/include -iwithsysroot /nix/store/wlp2bii0r52zh2p7bkp84v0jwqj22ya9-libcxx-11.1.0-dev/include -iwithsysroot /nix/store/4y75qfpvq1mxifm2i4c6k52a3a9rc3hw-libcxxabi-11.1.0-dev/include -iwithsysroot /nix/store/grc1xfrcl512j1qrn8cdjd1gyaxhq6ca-libobjc-11.0.0/include -iwithsysroot /nix/store/hpk7m3zqrlfsmzhhg6yyyqjs6v5bsgfg-clang-14.0.1-dev/include -iwithsysroot /nix/store/wlp2bii0r52zh2p7bkp84v0jwqj22ya9-libcxx-11.1.0-dev/include -iwithsysroot /nix/store/4y75qfpvq1mxifm2i4c6k52a3a9rc3hw-libcxxabi-11.1.0-dev/include -iwithsysroot /nix/store/grc1xfrcl512j1qrn8cdjd1gyaxhq6ca-libobjc-11.0.0/include -Xclang -detailed-preprocessing-record /Users/haze/Code/cakewalk/zig-cache/o/5631d7c3def33ffdb9b4f1857468d0c0/cimport.h
./src/main.zig:1:19: error: C import failed
pub const clang = @cImport({
                  ^
/nix/store/hpk7m3zqrlfsmzhhg6yyyqjs6v5bsgfg-clang-14.0.1-dev/include/clang-c/Index.h:19:10: note: 'time.h' file not found
#include <time.h>
         ^
cakewalk...The following command exited with error code 1:
/Users/haze/Code/zig/_build.macos-arm64/zig build-exe /Users/haze/Code/cakewalk/src/main.zig -lclang -lc --verbose-cc --cache-dir /Users/haze/Code/cakewalk/zig-cache --global-cache-dir /Users/haze/.cache/zig --name cakewalk -I /nix/store/hpk7m3zqrlfsmzhhg6yyyqjs6v5bsgfg-clang-14.0.1-dev/include --enable-cache 
error: the following build command failed with exit code 1:
/Users/haze/Code/cakewalk/zig-cache/o/af98af65172951b69cc60fe1d520576a/build /Users/haze/Code/zig/_build.macos-arm64/zig /Users/haze/Code/cakewalk /Users/haze/Code/cakewalk/zig-cache /Users/haze/.cache/zig --verbose-cc run

basically, have a project that depends on a c library (in my case, libclang) and attempt to cImport/cInclude a header from that project

(in my case for nix, zig can't find the header I'm including, even though verbose-cc knows about it)
if I manually add the include path to the build.zig, I then see the error that time.h cannot be found

Expected Behavior

A successful compilation

Actual Behavior

An error complaining that time.h is not found