tevent: fix pkgsLLVM build

pkgs/by-name/te/tevent/package.nix

@@ -67,6 +67,11 @@ stdenv.mkDerivation rec {
   # module, which works correctly in all cases.
   PYTHON_CONFIG = "/invalid";
 
+  # https://reviews.llvm.org/D135402
+  NIX_LDFLAGS = lib.optional (
+    stdenv.cc.bintools.isLLVM && lib.versionAtLeast stdenv.cc.bintools.version "17"
+  ) "--undefined-version";
+
   meta = with lib; {
     description = "Event system based on the talloc memory management library";
     homepage = "https://tevent.samba.org/";