forgot to install the LeastSquares header

Eigen/CMakeLists.txt

diff --git a/Eigen/CMakeLists.txt b/Eigen/CMakeLists.txt
index 1a9e2a6..e3aa679 100644
--- a/Eigen/CMakeLists.txt
+++ b/Eigen/CMakeLists.txt
@@ -1,4 +1,4 @@
-set(Eigen_HEADERS Core LU Cholesky QR Geometry Sparse Array SVD Regression)
+set(Eigen_HEADERS Core LU Cholesky QR Geometry Sparse Array SVD Regression LeastSquares)
 
 if(EIGEN_BUILD_LIB)
     set(Eigen_SRCS