diff --git a/src/dim2/rotmat2.rs b/src/dim2/rotmat2.rs
new file mode 100644
index 00000000..469d8d98
--- /dev/null
+++ b/src/dim2/rotmat2.rs
@@ -0,0 +1,92 @@
+use core::num::{One, Zero};
+use traits::workarounds::trigonometric::Trigonometric;
+use traits::dim::Dim;
+use dim2::mat2::Mat2;
+// use dim2::vec2::Vec2;
+
+// FIXME: using a newtype did not compile (due a compiler bug)
+// pub type Rotmat2<T> = (Mat2<T>)
+#[deriving(Eq)]
+pub struct Rotmat2<T>
+{
+  submat: Mat2<T>
+}
+
+pub fn Rotmat2<T:Copy + Trigonometric + Neg<T>>(angle: T) -> Rotmat2<T>
+{
+  let coa = angle.cos();
+  let sia = angle.sin();
+
+  Rotmat2
+  { submat: Mat2(coa, -sia, sia, coa) }
+}
+
+impl<T> Dim for Rotmat2<T>
+{
+  fn dim() -> uint
+  { 2 }
+}
+ 
+impl<T:Copy + One + Zero> One for Rotmat2<T>
+{
+  fn one() -> Rotmat2<T>
+  { Rotmat2 { submat: One::one() } }
+}
+
+impl<T:Copy + Mul<T, T> + Add<T, T>> Mul<Rotmat2<T>, Rotmat2<T>> for Rotmat2<T>
+{
+  fn mul(&self, other: &Rotmat2<T>) -> Rotmat2<T>
+  { Rotmat2 { submat: self.submat.mul(&other.submat) } }
+}
+
+// FIXME: implementation of the same classes for the same struct fails
+// with "internal compiler error: Asked to compute kind of a type variable".
+//
+// impl<T:Copy + Mul<T, T> + Add<T, T>> Mul<Vec2<T>, Vec2<T>> for Rotmat2<T>
+// {
+//   fn mul(&self, v: &Vec2<T>) -> Vec2<T>
+//   { Vec2(self.m11 * v.x + self.m12 * v.y, self.m21 * v.x + self.m22 * v.y) }
+// }
+
+// FIXME: implementation of the same classes for the same struct (here Vec2<T>)
+// fails with "internal compiler error: Asked to compute kind of a type
+// variable".
+//
+// impl<T:Copy + Mul<T, T> + Add<T, T>> Mul<Rotmat2<T>, Vec2<T>> for Vec2<T>
+// {
+//   fn mul(&self, m: &Rotmat2<T>) -> Vec2<T>
+//   { self.mult(&m.submat) }
+// }
+
+/*
+impl<T:Copy + Mul<T, T> + Div<T, T> + Sub<T, T> + Neg<T> + Eq + Zero>
+Inv<T> for Rotmat2<T>
+{
+  fn inv(&self) -> Rotmat2<T>
+  {
+    // transpose
+    Rotmat2(
+      Mat2(
+        self.submat.m11, self.submat.m21,
+        self.submat.m12, self.submat.m22
+      )
+    )
+  }
+}
+*/
+
+/*
+impl<T:ToStr> ToStr for Rotmat2<T>
+{
+  fn to_str(&self) -> ~str
+  {
+    ~"Rotmat2 {"
+    + " m11: " + self.m11.to_str()
+    + " m12: " + self.m12.to_str()
+
+    + " m21: " + self.m21.to_str()
+    + " m22: " + self.m22.to_str()
+    + " }"
+  }
+}
+*/
diff --git a/src/nalgebra.rc b/src/nalgebra.rc
new file mode 100644
index 00000000..d30f326e
--- /dev/null
+++ b/src/nalgebra.rc
@@ -0,0 +1,55 @@
+#[link(name = "nalgebra"
+       , vers = "0.0"
+       , author = "Sébastien Crozet"
+       , uuid = "1E96070F-4778-4EC1-B080-BF69F7048216")];
+#[crate_type = "lib"];
+#[warn(non_camel_case_types)]
+
+extern mod std;
+
+pub use dim2::vec2::Vec2;
+pub use dim3::vec3::Vec3;
+pub use dim2::mat2::Mat2;
+pub use dim2::rotmat2::Rotmat2;
+
+pub use traits::dot::Dot;
+pub use traits::cross::Cross;
+pub use traits::dim::Dim;
+
+pub use traits::workarounds::sqrt::Sqrt;
+pub use traits::workarounds::trigonometric::Trigonometric;
+
+pub use traits::inv::Inv;
+pub use traits::transpose::Transpose;
+
+mod dim2
+{
+  mod vec2;
+  mod mat2;
+  mod rotmat2;
+}
+
+mod dim3
+{
+  mod vec3;
+  mod mat3;
+}
+
+mod ndim
+{
+}
+
+mod traits
+{
+  mod dot;
+  mod cross;
+  mod inv;
+  mod transpose;
+  mod dim;
+
+  mod workarounds
+  {
+    mod sqrt;
+    mod trigonometric;
+  }
+}
diff --git a/src/traits/cross.rs b/src/traits/cross.rs
new file mode 100644
index 00000000..cf17a324
--- /dev/null
+++ b/src/traits/cross.rs
@@ -0,0 +1,4 @@
+pub trait Cross<Result>
+{
+  fn cross(&self, other : &Self) -> Result;
+}
diff --git a/src/traits/dim.rs b/src/traits/dim.rs
new file mode 100644
index 00000000..5d8f68c9
--- /dev/null
+++ b/src/traits/dim.rs
@@ -0,0 +1,4 @@
+pub trait Dim
+{
+  fn dim() -> uint;
+}
diff --git a/src/traits/transpose.rs b/src/traits/transpose.rs
new file mode 100644
index 00000000..459adac2
--- /dev/null
+++ b/src/traits/transpose.rs
@@ -0,0 +1,6 @@
+// FIXME: valid only for square matrices…
+pub trait Transpose
+{
+  fn transposed(&self) -> Self;
+  fn transpose(&mut self);
+}
diff --git a/src/traits/workarounds/sqrt.rs b/src/traits/workarounds/sqrt.rs
new file mode 100644
index 00000000..9da09ca6
--- /dev/null
+++ b/src/traits/workarounds/sqrt.rs
@@ -0,0 +1,17 @@
+// FIXME: this does not seem to exist already
+// but it will surely be added someday.
+
+pub trait Sqrt
+{
+  fn sqrt(&self) -> Self;
+}
+
+impl Sqrt for f64
+{
+  fn sqrt(&self) -> f64 { f64::sqrt(*self) }
+}
+
+impl Sqrt for f32
+{
+  fn sqrt(&self) -> f32 { f32::sqrt(*self) }
+}
diff --git a/src/traits/workarounds/trigonometric.rs b/src/traits/workarounds/trigonometric.rs
new file mode 100644
index 00000000..bf8af8cf
--- /dev/null
+++ b/src/traits/workarounds/trigonometric.rs
@@ -0,0 +1,5 @@
+pub trait Trigonometric
+{
+  fn sin(&self) -> Self;
+  fn cos(&self) -> Self;
+}