erlang: add setupHook to set ERL_LIBS

pkgs/development/interpreters/erlang/R14.nix

@@ -42,6 +42,8 @@ stdenv.mkDerivation {
     wrapProgram $out/lib/erlang/bin/start_erl --prefix PATH ":" "${gnused}/bin/:${gawk}/bin"
   '';
 
+  setupHook = ./setup-hook.sh;
+
   meta = {
     homepage = "http://www.erlang.org/";
     description = "Programming language used for massively scalable soft real-time systems";

pkgs/development/interpreters/erlang/R15.nix

@@ -48,6 +48,8 @@ stdenv.mkDerivation {
     wrapProgram $out/lib/erlang/bin/start_erl --prefix PATH ":" "${gnused}/bin/:${gawk}/bin"
   '';
 
+  setupHook = ./setup-hook.sh;
+
   meta = {
     homepage = "http://www.erlang.org/";
     description = "Programming language used for massively scalable soft real-time systems";

pkgs/development/interpreters/erlang/R16.nix

@@ -52,6 +52,8 @@ stdenv.mkDerivation rec {
     wrapProgram $out/lib/erlang/bin/start_erl --prefix PATH ":" "${gnused}/bin/:${gawk}/bin"
   '';
 
+  setupHook = ./setup-hook.sh;
+
   meta = {
     homepage = "http://www.erlang.org/";
     description = "Programming language used for massively scalable soft real-time systems";

pkgs/development/interpreters/erlang/R17.nix

@@ -67,6 +67,8 @@ stdenv.mkDerivation rec {
     wrapProgram $out/lib/erlang/bin/start_erl --prefix PATH ":" "${gnused}/bin/:${gawk}/bin"
   '';
 
+  setupHook = ./setup-hook.sh;
+
   meta = {
     homepage = "http://www.erlang.org/";
     description = "Programming language used for massively scalable soft real-time systems";

pkgs/development/interpreters/erlang/R18.nix

@@ -67,6 +67,8 @@ stdenv.mkDerivation rec {
     wrapProgram $out/lib/erlang/bin/start_erl --prefix PATH ":" "${gnused}/bin/:${gawk}/bin"
   '';
 
+  setupHook = ./setup-hook.sh;
+
   meta = {
     homepage = "http://www.erlang.org/";
     description = "Programming language used for massively scalable soft real-time systems";

pkgs/development/interpreters/erlang/setup-hook.sh

@@ -0,0 +1,5 @@
+addErlangLibPath() {
+    addToSearchPath ERL_LIBS $1/lib/erlang/lib
+}
+
+envHooks+=(addErlangLibPath)