https://github.com/tectonic-typesetting/tectonic/commit/d260961426b01f7643ba0f35f493bdb671eeaf3f
--- a/crates/xetex_layout/build.rs      2024-12-08 10:19:21.243061431 -0000
+++ b/crates/xetex_layout/build.rs      2024-12-08 10:44:13.539667493 -0000
@@ -86,7 +86,7 @@
     let mut cppcfg = cc::Build::new();

     let cppflags = [
-        "-std=c++14",
+        "-std=c++17",
         "-Wall",
         "-Wdate-time",
         "-Wendif-labels",