Commit e75dfbcb3f

@@ -87,6 +87,12 @@ pub fn main() !void {
                     warn("Expected argument after {s}\n\n", .{arg});
                     return usageAndErr(builder, false, stderr_stream);
                 };
+            } else if (mem.eql(u8, arg, "--sysroot")) {
+                const sysroot = nextArg(args, &arg_idx) orelse {
+                    warn("Expected argument after --sysroot\n\n", .{});
+                    return usageAndErr(builder, false, stderr_stream);
+                };
+                builder.sysroot = sysroot;
             } else if (mem.eql(u8, arg, "--search-prefix")) {
                 const search_prefix = nextArg(args, &arg_idx) orelse {
                     warn("Expected argument after --search-prefix\n\n", .{});
@@ -195,6 +201,7 @@ fn usage(builder: *Builder, already_ran_build: bool, out_stream: anytype) !void
         \\  -h, --help                  Print this help and exit
         \\  --verbose                   Print commands before executing them
         \\  -p, --prefix [path]         Override default install prefix
+        \\  --sysroot [path]            Set the system root directory (usually /)
         \\  --search-prefix [path]      Add a path to look for binaries, libraries, headers
         \\  --libc [file]               Provide a file which specifies libc paths
         \\  --color [auto|off|on]       Enable or disable colored error messages

@@ -57,6 +57,7 @@ pub const Builder = struct {
     exe_dir: []const u8,
     h_dir: []const u8,
     install_path: []const u8,
+    sysroot: ?[]const u8 = null,
     search_prefixes: ArrayList([]const u8),
     libc_file: ?[]const u8 = null,
     installed_files: ArrayList(InstalledFile),
@@ -2601,6 +2602,10 @@ pub const LibExeObjStep = struct {
             }
         }
 
+        if (builder.sysroot) |sysroot| {
+            try zig_args.appendSlice(&[_][]const u8{ "--sysroot", sysroot });
+        }
+
         for (builder.search_prefixes.items) |search_prefix| {
             try zig_args.append("-L");
             try zig_args.append(try fs.path.join(builder.allocator, &[_][]const u8{