nut: fix search modes not finding dynamic libs

pkgs/applications/misc/nut/default.nix

@@ -1,4 +1,4 @@
-{ lib, stdenv, fetchurl, pkg-config, neon, libusb-compat-0_1, openssl, udev, avahi, freeipmi
+{ lib, stdenv, fetchurl, substituteAll, pkg-config, neon, libusb-compat-0_1, openssl, udev, avahi, freeipmi
 , libtool, makeWrapper, autoreconfHook, fetchpatch
 }:
 
@@ -17,6 +17,13 @@ stdenv.mkDerivation rec {
       url = "https://github.com/networkupstools/nut/commit/612c05efb3c3b243da603a3a050993281888b6e3.patch";
       sha256 = "0jdbii1z5sqyv24286j5px65j7b3gp8zk3ahbph83pig6g46m3hs";
     })
+    (substituteAll {
+      src = ./hardcode-paths.patch;
+      avahi = "${avahi}/lib";
+      freeipmi = "${freeipmi}/lib";
+      libusb = "${libusb-compat-0_1}/lib";
+      neon = "${neon}/lib";
+    })
   ];
 
   buildInputs = [ neon libusb-compat-0_1 openssl udev avahi freeipmi ];
@@ -38,11 +45,6 @@ stdenv.mkDerivation rec {
 
   NIX_CFLAGS_COMPILE = [ "-std=c++14" ];
 
-  postInstall = ''
-    wrapProgram $out/bin/nut-scanner --prefix LD_LIBRARY_PATH : \
-      "$out/lib:${neon}/lib:${libusb-compat-0_1.out}/lib:${avahi}/lib:${freeipmi}/lib"
-  '';
-
   meta = with lib; {
     description = "Network UPS Tools";
     longDescription = ''

pkgs/applications/misc/nut/hardcode-paths.patch

@@ -0,0 +1,13 @@
+--- a/tools/nut-scanner/nutscan-init.c
++++ b/tools/nut-scanner/nutscan-init.c
+@@ -44,6 +44,10 @@ int nutscan_load_upsclient_library(const char *libname_path);
+ 
+ /* FIXME: would be good to get more from /etc/ld.so.conf[.d] */
+ char * search_paths[] = {
++	"@avahi@",
++	"@freeipmi@",
++	"@libusb@",
++	"@neon@",
+ 	LIBDIR,
+ 	"/usr/lib64",
+ 	"/lib64",