diff --git a/pkgs/development/libraries/opencascade/default.nix b/pkgs/development/libraries/opencascade/default.nix
index 44e29fd7587f..ca792ed4c914 100644
--- a/pkgs/development/libraries/opencascade/default.nix
+++ b/pkgs/development/libraries/opencascade/default.nix
@@ -1,4 +1,4 @@
-{stdenv, fetchurl, mesa, tcl, tk, file}:
+{stdenv, fetchurl, mesa, tcl, tk, file, libXmu}:
 
 stdenv.mkDerivation rec {
   name = "opencascade-6.3.0";
@@ -7,12 +7,14 @@ stdenv.mkDerivation rec {
     md5 = "52778127974cb3141c2827f9d40d1f11";
   };
 
-  buildInputs = [ mesa tcl tk file ];
+  buildInputs = [ mesa tcl tk file libXmu ];
 
   preConfigure = ''
     cd ros
   '';
 
+  configureFlags = [ "--with-tcl=${tcl}/lib" "--with-tk=${tk}/lib" ];
+
   postInstall = ''
     mv $out/inc $out/include
     ensureDir $out/share/doc/${name}
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 76e9abb6fd49..b4061af7211c 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -4623,6 +4623,7 @@ let
 
   opencascade = import ../development/libraries/opencascade {
     inherit fetchurl stdenv mesa tcl tk file;
+    inherit (xlibs) libXmu;
   };
 
   openct = import ../development/libraries/openct {