diff -r 7ec1cfe19a24 -r a4137aedcb3a dolfinx-sys/build.rs
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dolfinx-sys/build.rs	Thu Feb 26 09:32:12 2026 -0500
@@ -0,0 +1,51 @@
+use build_print::info;
+use conda_build::pkgconfig_conda;
+use itertools::Itertools;
+use std::env;
+
+fn main() -> Result<(), anyhow::Error> {
+    if let Some(conda_root) = pkgconfig_conda()? {
+        info!(
+            "Directing pkg-config to look for fenics-dolfinx within the Conda environment {}.",
+            conda_root.display()
+        );
+    }
+
+    println!("cargo:rerun-if-changed=build.rs");
+
+    let mut pkg = pkg_config::Config::new();
+    locate_dolfinx(&mut pkg)
+}
+
+fn locate_dolfinx(pkg: &mut pkg_config::Config) -> Result<(), anyhow::Error> {
+    let lib = pkg.probe("dolfinx").or_else(|e| {
+        // Debian/Ubuntu has separate real and complex dolfinx.
+        info!("Could not find dolfinx, trying dolfinx_real (as the library is named if installed through a Debian/Ubuntu package).");
+        // If that's also not found, return original error instead of Debian/Ubuntu-specic error.
+        pkg.probe("dolfinx_real").map_err(|_| e)
+    })?;
+
+    // We also need fmt for linking to work.
+    pkg.probe("fmt")?;
+
+    let cleaned_paths = lib.include_paths.iter().unique().collect::<Vec<_>>();
+    let includes = env::join_paths(cleaned_paths)?.into_string().unwrap();
+    println!("cargo:include={}", includes);
+
+    println!(
+        "cargo:ldflags={}",
+        env::join_paths(lib.ld_args.iter().map(|s| s.join(",")))?
+            .into_string()
+            .unwrap()
+    );
+
+    // let cleaned_rpaths = lib.link_paths.iter().unique().collect::<Vec<_>>();
+    // let rpaths = env::join_paths(cleaned_rpaths)?.into_string().unwrap();
+    // println!("cargo:rpath={}", rpaths);
+
+    // for lp in lib.link_paths.iter().unique() {
+    //     println!("cargo:rustc-link-arg=-Wl,-rpath,{}", lp.display());
+    // }
+
+    Ok(())
+}