--- tree/CMakeLists.txt.orig	2022-12-18 09:35:42 UTC
+++ tree/CMakeLists.txt
@@ -52,17 +52,18 @@ set(PYBIND_VER v2.10.1)
 
 # Fetch pybind to be able to use pybind11_add_module symbol.
 set(PYBIND_VER v2.10.1)
-include(FetchContent)
-FetchContent_Declare(
-  pybind11
-  GIT_REPOSITORY https://github.com/pybind/pybind11
-  GIT_TAG        ${PYBIND_VER}
-)
-if(NOT pybind11_POPULATED)
-    FetchContent_Populate(pybind11)
-    add_subdirectory(${pybind11_SOURCE_DIR} ${pybind11_BINARY_DIR})
-    include_directories(${pybind11_INCLUDE_DIR})
-endif()
+#include(FetchContent)
+#FetchContent_Declare(
+#  pybind11
+#  GIT_REPOSITORY https://github.com/pybind/pybind11
+#  GIT_TAG        ${PYBIND_VER}
+#)
+#if(NOT pybind11_POPULATED)
+#    FetchContent_Populate(pybind11)
+#    add_subdirectory(${pybind11_SOURCE_DIR} ${pybind11_BINARY_DIR})
+#    include_directories(${pybind11_INCLUDE_DIR})
+#endif()
+find_package(pybind11)
 
 # Needed to disable Abseil tests.
 set (BUILD_TESTING OFF)
@@ -83,27 +84,28 @@ endif()
         ${ABSEIL_CMAKE_ARGS}
         "-DCMAKE_OSX_ARCHITECTURES=${CMAKE_OSX_ARCHITECTURES}")
 endif()
-ExternalProject_Add(abseil-cpp
-  GIT_REPOSITORY    https://github.com/abseil/abseil-cpp.git
-  GIT_TAG           ${ABSEIL_VER}
-  PREFIX            ${CMAKE_SOURCE_DIR}/abseil-cpp
-  CMAKE_ARGS        ${ABSEIL_CMAKE_ARGS}
-)
-ExternalProject_Get_Property(abseil-cpp install_dir)
-set(abseil_install_dir ${install_dir})
+#ExternalProject_Add(abseil-cpp
+#  GIT_REPOSITORY    https://github.com/abseil/abseil-cpp.git
+#  GIT_TAG           ${ABSEIL_VER}
+#  PREFIX            ${CMAKE_SOURCE_DIR}/abseil-cpp
+#  CMAKE_ARGS        ${ABSEIL_CMAKE_ARGS}
+#)
+#ExternalProject_Get_Property(abseil-cpp install_dir)
+find_package(absl REQUIRED)
+set(abseil_install_dir $ENV{FREEBSD_LOCALBASE})
 include_directories (${abseil_install_dir}/include)
 
 
 # Define pybind11 tree module.
 pybind11_add_module(_tree tree.h tree.cc)
-add_dependencies(_tree abseil-cpp)
+add_dependencies(_tree absl::strings absl::config)
 
 if (WIN32 OR MSVC)
     set(ABSEIL_LIB_PREF "absl")
     set(LIB_SUFF "lib")
 else()
     set(ABSEIL_LIB_PREF "libabsl")
-    set(LIB_SUFF "a")
+    set(LIB_SUFF "so")
 endif()
 
 # Link abseil static libs.