seer: patch hardcoded gdb paths

By default, seer tries to use gdb from /usr/bin/gdb

seer changes

pkgs/development/tools/misc/seer/default.nix

@@ -1,4 +1,4 @@
-{ lib, stdenv, fetchFromGitHub, cmake, qtcharts, qtbase, wrapQtAppsHook }:
+{ lib, stdenv, fetchFromGitHub, cmake, gdb, qtcharts, qtbase, wrapQtAppsHook }:
 
 stdenv.mkDerivation rec {
   pname = "seer";
@@ -15,6 +15,11 @@ stdenv.mkDerivation rec {
     cd src
   '';
 
+  patchPhase = ''
+    substituteInPlace src/{SeerGdbConfigPage,SeerMainWindow,SeerGdbWidget}.cpp \
+      --replace "/usr/bin/gdb" "${gdb}/bin/gdb"
+  '';
+
   buildInputs = [ qtbase qtcharts ];
   nativeBuildInputs = [ cmake wrapQtAppsHook ];