diff --git a/pkgs/applications/networking/instant-messengers/tkabber/default.nix b/pkgs/applications/networking/instant-messengers/tkabber/default.nix
index 30c91d3d905b..6014f582467a 100644
--- a/pkgs/applications/networking/instant-messengers/tkabber/default.nix
+++ b/pkgs/applications/networking/instant-messengers/tkabber/default.nix
@@ -26,10 +26,10 @@ stdenv.mkDerivation rec {
   '';
 
   postInstall = ''
-    wrapProgram $out/bin/tkabber --set TCLLIBPATH "${bwidget}/tcltk\ ${tcllib}/lib/tcllib${tcllib.version}\ ${tcltls}/lib/tls${tcltls.version}"
+    wrapProgram $out/bin/tkabber --set TCLLIBPATH "${bwidget}/lib/${bwidget.libPrefix}\ ${tcllib}/lib/${tcllib.libPrefix}\ ${tcltls}/lib/${tcltls.libPrefix}"
   '';
 
-  buildInputs = [tcl tk tcllib tcltls bwidget x11 makeWrapper];
+  buildInputs = [ tcl tk tcllib tcltls bwidget x11 makeWrapper ];
 
   meta = {
     homepage = "http://tkabber.jabber.ru/";
diff --git a/pkgs/development/libraries/bwidget/default.nix b/pkgs/development/libraries/bwidget/default.nix
index 693e0587a0b2..b8aed94bb0be 100644
--- a/pkgs/development/libraries/bwidget/default.nix
+++ b/pkgs/development/libraries/bwidget/default.nix
@@ -12,9 +12,13 @@ stdenv.mkDerivation rec {
   dontBuild = true;
 
   installPhase = ''
-    ensureDir "$out/tcltk"
-    cp -R *.tcl lang images "$out/tcltk/"
+    ensureDir "$out/lib/${passthru.libPrefix}"
+    cp -R *.tcl lang images "$out/lib/${passthru.libPrefix}"
   '';
 
-  buildInputs = [tcl];
+  passthru = {
+    libPrefix = "bwidget${version}";
+  };
+
+  buildInputs = [ tcl ];
 }
diff --git a/pkgs/development/libraries/tcllib/default.nix b/pkgs/development/libraries/tcllib/default.nix
index fcfbbe19d949..6aec229f5295 100644
--- a/pkgs/development/libraries/tcllib/default.nix
+++ b/pkgs/development/libraries/tcllib/default.nix
@@ -9,5 +9,9 @@ stdenv.mkDerivation rec {
     sha256 = "11052fgfmv9vyswzjjgfvh3pi0k3fnfnl9ri6nl4vc6f6z5ry56x";
   };
 
-  buildInputs = [tcl];
+  passthru = {
+    libPrefix = "tcllib${version}";
+  };
+
+  buildInputs = [ tcl ];
 }
diff --git a/pkgs/development/libraries/tcltls/default.nix b/pkgs/development/libraries/tcltls/default.nix
index dbbfc3d38556..3f984c377dd1 100644
--- a/pkgs/development/libraries/tcltls/default.nix
+++ b/pkgs/development/libraries/tcltls/default.nix
@@ -17,5 +17,9 @@ stdenv.mkDerivation rec {
     sha256 = "adec50143a9ad634a671d24f7c7bbf2455487eb5f12d290f41797c32a98b93f3";
   };
 
-  buildInputs = [tcl openssl];
+  passthru = {
+    libPrefix = "tls${version}";
+  };
+
+  buildInputs = [ tcl openssl ];
 }