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diff --git a/extern/libmv/libmv/multiview/panography_kernel.cc b/extern/libmv/libmv/multiview/panography_kernel.cc
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+// Copyright (c) 2008, 2009 libmv authors.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to
+// deal in the Software without restriction, including without limitation the
+// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+// sell copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+// IN THE SOFTWARE.
+
+#include "libmv/multiview/panography_kernel.h"
+#include "libmv/multiview/panography.h"
+
+namespace libmv {
+namespace panography {
+namespace kernel {
+
+void TwoPointSolver::Solve(const Mat &x1, const Mat &x2, vector<Mat3> *Hs) {
+  // Solve for the focal lengths.
+  vector<double> fs;
+  F_FromCorrespondance_2points(x1, x2, &fs);
+
+  // Then solve for the rotations and homographies.
+  Mat x1h, x2h;
+  EuclideanToHomogeneous(x1, &x1h);
+  EuclideanToHomogeneous(x2, &x2h);
+  for (int i = 0; i < fs.size(); ++i)  {
+    Mat3 K1 = Mat3::Identity() * fs[i];
+    K1(2, 2) = 1.0;
+
+    Mat3 R;
+    GetR_FixedCameraCenter(x1h, x2h, fs[i], &R);
+    R /= R(2, 2);
+
+    (*Hs).push_back(K1 * R * K1.inverse());
+  }
+}
+
+}  // namespace kernel
+}  // namespace panography
+}  // namespace libmv