diff --git a/build.zig b/build.zig
index f7b08f9..ad6f87d 100644
--- a/build.zig
+++ b/build.zig
@@ -12,8 +12,8 @@ fn setupLinks(step: *builds.LibExeObjStep) void {
     step.linkSystemLibrary("GraphicsMagickWand");
     step.linkSystemLibrary("GraphicsMagick");
 
-    step.addIncludeDir("/usr/include/GraphicsMagick");
-    step.addIncludeDir("/usr/include");
+    step.addIncludePath("/usr/include/GraphicsMagick");
+    step.addIncludePath("/usr/include");
 
     const possible_lilv_include_dirs = [_][]const u8{
         "/usr/include/lilv-0/lilv",
@@ -24,7 +24,7 @@ fn setupLinks(step: *builds.LibExeObjStep) void {
 
     for (possible_lilv_include_dirs) |possible_lilv_dir| {
         var possible_dir = std.fs.cwd().openDir(possible_lilv_dir, .{}) catch |err| {
-            std.debug.print("possible lilv {s} fail: {s}\n", .{ possible_lilv_dir, err });
+            std.debug.print("possible lilv {s} fail: {s}\n", .{ possible_lilv_dir, @errorName(err) });
             continue;
         };
 
@@ -32,7 +32,7 @@ fn setupLinks(step: *builds.LibExeObjStep) void {
         found_any_lilv = true;
 
         std.debug.print("found lilv at '{s}'\n", .{possible_lilv_dir});
-        step.addIncludeDir(possible_lilv_dir);
+        step.addIncludePath(possible_lilv_dir);
     }
 
     if (!found_any_lilv) {
diff --git a/src/lang.zig b/src/lang.zig
index 5ded695..e4a742d 100644
--- a/src/lang.zig
+++ b/src/lang.zig
@@ -94,7 +94,7 @@ pub const Command = struct {
         rotate,
     };
 
-    pub fn tagToType(tag: Tag) type {
+    pub fn tagToType(comptime tag: Tag) type {
         return switch (tag) {
             .noop => Noop,
             .load => Load,
@@ -147,7 +147,7 @@ pub const Command = struct {
     }
 
     pub fn print(base: *const @This()) void {
-        log.debug("tag: {s}\n", .{base.tag});
+        log.debug("tag: {}\n", .{base.tag});
     }
 
     pub const Noop = struct {
@@ -529,9 +529,9 @@ pub const Lang = struct {
     }
 
     fn doError(self: *Lang, comptime fmt: []const u8, args: anytype) void {
-        log.err("ERROR! at line {}: ", .{self.line});
-        log.err(fmt, args);
-        log.err("\n", .{});
+        log.warn("ERROR! at line {}: ", .{self.line});
+        log.warn(fmt, args);
+        log.warn("\n", .{});
         self.has_error = true;
     }
 
@@ -622,7 +622,7 @@ pub const Lang = struct {
 
         cmd.base.tag = command_struct.base_tag;
         const command = cmd.base.cast(command_struct).?;
-        log.debug("cmd: {s}\n", .{command});
+        log.debug("cmd: {}\n", .{command});
     }
 
     pub fn parse(self: *Lang, data: []const u8) !CommandList {
diff --git a/src/runner.zig b/src/runner.zig
index eb41231..969c469 100644
--- a/src/runner.zig
+++ b/src/runner.zig
@@ -57,6 +57,7 @@ pub const Runner = struct {
     }
 
     fn resolveArg(self: *Runner, load_path: []const u8) ![]const u8 {
+        std.debug.assert(load_path.len > 0);
         if (load_path[0] == ':') {
             // parse the index from 1 to end
             var index = try std.fmt.parseInt(usize, load_path[1..], 10);
@@ -131,7 +132,7 @@ pub const Runner = struct {
         const basename = std.fs.path.basename(image.path);
         const dirname = std.fs.path.dirname(image.path).?;
 
-        var dir = try std.fs.cwd().openDir(dirname, .{ .iterate = true });
+        var dir = try std.fs.cwd().openIterableDir(dirname, .{});
         defer dir.close();
 
         const period_idx = std.mem.lastIndexOf(u8, basename, ".").?;
@@ -199,11 +200,11 @@ pub const Runner = struct {
         defer self.allocator.free(out_path);
         try image.saveTo(out_path);
 
-        var proc = try std.ChildProcess.init(
+        var proc = std.ChildProcess.init(
             &[_][]const u8{ runqs.program, out_path },
             self.allocator,
         );
-        defer proc.deinit();
+        //defer proc.deinit();
 
         log.debug("running '{s} {s}'\n", .{ runqs.program, out_path });
         _ = try proc.spawnAndWait();
@@ -331,7 +332,9 @@ test "running noop" {
     defer cmds.deinit();
 
     var command = lang.Command{ .tag = .noop };
-    var noop = lang.Command.Noop{ .base = command };
+
+    var noop = try allocator.create(lang.Command.Noop);
+    noop.* = lang.Command.Noop{ .base = command };
     try cmds.append(&noop.base);
 
     var runner = Runner.init(allocator, false);