diff --git a/lib/compiler/build_runner.zig b/lib/compiler/build_runner.zig
index a434ceed24..114a9e3acf 100644
--- a/lib/compiler/build_runner.zig
+++ b/lib/compiler/build_runner.zig
@@ -260,6 +260,10 @@ pub fn main() !void {
                 graph.incremental = true;
             } else if (mem.eql(u8, arg, "-fno-incremental")) {
                 graph.incremental = false;
+            } else if (mem.eql(u8, arg, "-fallow-deprecated")) {
+                graph.allow_deprecated = true;
+            } else if (mem.eql(u8, arg, "-fno-allow-deprecated")) {
+                graph.allow_deprecated = false;
             } else if (mem.eql(u8, arg, "-fwine")) {
                 builder.enable_wine = true;
             } else if (mem.eql(u8, arg, "-fno-wine")) {
@@ -1283,6 +1287,8 @@ fn usage(b: *std.Build, out_stream: anytype) !void {
         \\    new                        Omit cached steps
         \\    failures                   (Default) Only print failed steps
         \\    none                       Do not print the build summary
+        \\  -fallow-deprecated           Allow usage of deprecated code for the entire build graph
+        \\  -fno-allow-deprecated        Disallow usage of deprecated code for the entire build graph
         \\  -j<N>                        Limit concurrent jobs (default is to use all CPU cores)
         \\  --maxrss <bytes>             Limit memory usage (default is to use available memory)
         \\  --skip-oom-steps             Instead of failing, skip steps that would exceed --maxrss
diff --git a/lib/std/Build.zig b/lib/std/Build.zig
index 4afdcd2bff..0ba5c43a46 100644
--- a/lib/std/Build.zig
+++ b/lib/std/Build.zig
@@ -94,6 +94,9 @@ available_deps: AvailableDeps,
 
 release_mode: ReleaseMode,
 
+// True only for the top-level builder.
+is_root: bool = false,
+
 pub const ReleaseMode = enum {
     off,
     any,
@@ -118,6 +121,7 @@ pub const Graph = struct {
     /// Information about the native target. Computed before build() is invoked.
     host: ResolvedTarget,
     incremental: ?bool = null,
+    allow_deprecated: ?bool = null,
     random_seed: u32 = 0,
     dependency_cache: InitializedDepMap = .empty,
     allow_so_scripts: ?bool = null,
@@ -304,6 +308,7 @@ pub fn create(
         .pkg_hash = "",
         .available_deps = available_deps,
         .release_mode = .off,
+        .is_root = true,
     };
     try b.top_level_steps.put(arena, b.install_tls.step.name, &b.install_tls);
     try b.top_level_steps.put(arena, b.uninstall_tls.step.name, &b.uninstall_tls);
diff --git a/lib/std/Build/Module.zig b/lib/std/Build/Module.zig
index f299946731..d93fe84416 100644
--- a/lib/std/Build/Module.zig
+++ b/lib/std/Build/Module.zig
@@ -25,6 +25,7 @@ stack_check: ?bool,
 sanitize_c: ?bool,
 sanitize_thread: ?bool,
 fuzz: ?bool,
+allow_deprecated: ?bool,
 code_model: std.builtin.CodeModel,
 valgrind: ?bool,
 pic: ?bool,
@@ -284,6 +285,7 @@ pub fn init(
                 .owner = owner,
                 .root_source_file = if (options.root_source_file) |lp| lp.dupe(owner) else null,
                 .import_table = .{},
+                .allow_deprecated = owner.graph.allow_deprecated orelse !owner.is_root,
                 .resolved_target = options.target,
                 .optimize = options.optimize,
                 .link_libc = options.link_libc,
@@ -557,6 +559,10 @@ pub fn appendZigProcessFlags(
     try addFlag(zig_args, m.pic, "-fPIC", "-fno-PIC");
     try addFlag(zig_args, m.red_zone, "-mred-zone", "-mno-red-zone");
 
+    if (m.root_source_file != null) {
+        try addFlag(zig_args, m.allow_deprecated, "-fallow-deprecated", "-fno-allow-deprecated");
+    }
+
     if (m.dwarf_format) |dwarf_format| {
         try zig_args.append(switch (dwarf_format) {
             .@"32" => "-gdwarf32",