work around zig json bug

build_common.zig

@@ -17,7 +17,9 @@ pub fn confgenGet(comptime T: type, root_path: []const u8, alloc: std.mem.Alloca
         .init(alloc, buf_reader.reader());
     defer reader.deinit();
 
+    const ret = try std.json.parseFromTokenSource(T, alloc, &reader, confgen_json_opt);
+
     // We just grab the value from the parse result as this data will almost certainly have been
     // allocated with the builder's arena anyways.
-    return (try std.json.parseFromTokenSource(T, alloc, &reader, confgen_json_opt)).value;
+    return ret.value;
 }

mzte-nv/build.zig

@@ -20,7 +20,7 @@ pub fn build(b: *std.build.Builder) !void {
     const znvim_dep = b.dependency("znvim", .{ .target = target, .optimize = mode });
 
     const cg_opt = try common.confgenGet(struct {
-        term_font: []const u8,
+        term_font: []u8, // TODO: this being non-const is a workaround for an std bug
     }, "..", b.allocator);
 
     const opts = b.addOptions();

scripts/mzteinit/build.zig

@@ -17,7 +17,7 @@ pub fn build(b: *std.build.Builder) !void {
     exe.addModule("ansi-term", b.dependency("ansi_term", .{}).module("ansi-term"));
 
     const cg_opt = try common.confgenGet(struct {
-        gtk_theme: []const u8,
+        gtk_theme: []u8, // TODO: this being non-const is a workaround for an std bug
     }, "../..", b.allocator);
 
     const opts = b.addOptions();