diff --git a/pkgs/by-name/fl/flrig/package.nix b/pkgs/by-name/fl/flrig/package.nix
index 7e7b9f023667..083ff5bc48b5 100644
--- a/pkgs/by-name/fl/flrig/package.nix
+++ b/pkgs/by-name/fl/flrig/package.nix
@@ -27,6 +27,8 @@ stdenv.mkDerivation rec {
     pkg-config
   ];
 
+  env.FLTK_CONFIG = lib.getExe' (lib.getDev fltk13) "fltk-config";
+
   meta = {
     description = "Digital modem rig control program";
     homepage = "https://sourceforge.net/projects/fldigi/";