File PDAL_unbundle.patch of Package PDAL

diff --git i/CMakeLists.txt w/CMakeLists.txt
index 2a7a6c7e4..c2331d5b2 100644
--- i/CMakeLists.txt
+++ w/CMakeLists.txt
@@ -119,6 +119,10 @@ include(${PDAL_CMAKE_DIR}/lazperf.cmake)
 include(${PDAL_CMAKE_DIR}/gcs.cmake) # Optional
 include(${PDAL_CMAKE_DIR}/utfcpp.cmake)
 
+find_package(PkgConfig REQUIRED)
+PKG_CHECK_MODULES(EIGEN REQUIRED eigen3)
+set(PDAL_VENDOR_EIGEN_DIR "${EIGEN_INCLUDE_DIRS}")
+
 #------------------------------------------------------------------------------
 # generate the pdal_features.hpp header
 #------------------------------------------------------------------------------
diff --git i/cmake/directories.cmake w/cmake/directories.cmake
index 97e799bdb..f079ec725 100644
--- i/cmake/directories.cmake
+++ w/cmake/directories.cmake
@@ -11,5 +11,4 @@ set(PDAL_KERNELS_DIR ${ROOT_DIR}/kernels)
 set(PDAL_FILTERS_DIR ${ROOT_DIR}/filters)
 set(PDAL_IO_DIR ${ROOT_DIR}/io)
 set(PDAL_VENDOR_DIR ${ROOT_DIR}/vendor)
-set(PDAL_VENDOR_EIGEN_DIR "${PDAL_VENDOR_DIR}/eigen")