From 11f1d4ad2be7265fb59843f1ec4f1e656109e5e4 Mon Sep 17 00:00:00 2001
From: Jean-Christophe Amiel <jeanchristophe.amiel@orange.com>
Date: Wed, 18 Oct 2023 14:40:42 +0200
Subject: [PATCH] Display LIBXML2 env value on errors.

---
 build.rs | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/build.rs b/build.rs
index 0f4d3dbb0a..3ce598eb51 100644
--- a/build.rs
+++ b/build.rs
@@ -3,8 +3,15 @@ fn main() {
     // println!("{:?}", std::env::vars());
     // panic!("set libxml2.");
     let p = std::path::Path::new(s);
-    let fname = std::path::Path::new(p.file_name().expect("no file name in LIBXML2 env"));
-    assert!(p.is_file());
+    let fname = std::path::Path::new(
+      p.file_name()
+        .unwrap_or_else(|| panic!("no file name in LIBXML2 env ({s})")),
+    );
+    assert!(
+      p.is_file(),
+      "{}",
+      &format!("not a file in LIBXML2 env ({s})")
+    );
     println!(
       "cargo:rustc-link-lib={}",
       fname