diff --git a/pkgs/applications/science/math/scilab/default.nix b/pkgs/applications/science/math/scilab/default.nix
new file mode 100644
index 00000000000..09ae78bb46b
--- /dev/null
+++ b/pkgs/applications/science/math/scilab/default.nix
@@ -0,0 +1,76 @@
+{stdenv, fetchurl, lib, g77
+, ncurses
+, Xaw3d, withXaw3d ? false
+#, withPVMlib ? false
+, tcl, tk, withTk ? false
+, gtk, withGtk ? false # working ?
+#, withF2c ? false
+, ocaml, withOCaml ? false
+#, withJava ? false
+#, atlasMath, withAtlas ? false
+, x11, withX ? false
+}:
+
+stdenv.mkDerivation rec {
+  version = "4.1.2";
+  name = "scilab-${version}";
+  src = fetchurl {
+    url = "http://www.scilab.org/download/${version}/${name}-src.tar.gz";
+    # md5 coming from http://www.scilab.org/download/index_download.php
+    md5 = "17a7a6aa52918f33d96777a0dc423658";
+  };
+
+  buildInputs = [g77 ncurses]
+  ++ lib.optionals withGtk [gtk]
+  ++ lib.optionals withOCaml [ocaml]
+  ++ lib.optionals withX [x11]
+  ;
+
+
+/*
+  --with-atlas-library=DIR  Atlas library files are in DIR and we use Atlas
+*/
+  configureFlags = ""
+  # use gcc C compiler and gnu Fortran compiler (g77 or gfortran)
+  + " --with-gcc --with-g77"
+  # use Xaw3d widgets given with Scilab
+  + (lib.optionalString (!withXaw3d) " --with-local-xaw")
+  # do not compile with PVM library
+  + " --without-pvm"
+  # compile with GTK
+  + (if withGtk then "
+       --with-gtk --with-gtk2
+    " else "
+       --without-gtk --without-gtk2
+    ")
+  # compile with TCL/TK
+  + (lib.optionalString withTk "
+       --with-tk
+       --with-tcl-library=${tcl}/lib
+       --with-tcl-include=${tcl}/include
+       --with-tk-library=${tk}/lib
+       --with-tk-include=${tk}/include
+    ")
+  # do not use Gtk widgets
+  + " --without-gtk --without-gtk2"
+  # compile with ocaml
+  + (if withOCaml then " --with-ocaml" else " --without-ocaml")
+  # do not compile Java interface
+  + " --without-java"
+  # use the X Window System
+  + (lib.optionalString withX "
+      --with-x
+      --x-libraries=${x11}/lib
+      --x-includes=${x11}/include
+    ")
+  ;
+
+  makeFlags = "all";
+
+  meta = {
+    homepage = http://www.scilab.org/;
+    description = "Scientific software package for numerical computations (Matlab lookalike)";
+    # see http://www.scilab.org/legal
+    license = "SciLab";
+  };
+}
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index a581ddff476..756a371a89c 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -7298,6 +7298,20 @@ let
     inherit fetchurl stdenv readline;
   };
 
+  ### SCIENCE / MATH
+
+  scilab = (import ../applications/science/math/scilab) {
+    inherit stdenv fetchurl lib g77;
+    inherit (gtkLibs) gtk;
+    inherit ncurses Xaw3d tcl tk ocaml x11;
+
+    withXaw3d = false;
+    withTk = true;
+    withGtk = false;
+    withOCaml = true;
+    withX = true;
+  };
+
   ### MISC
 
   atari800 = import ../misc/emulators/atari800 {