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+# Copyright (C) 2000-2022 Kitware, Inc. and Contributors.
+# Copyright (C) 2022 The Qt Company Ltd.
+# SPDX-License-Identifier: BSD-3-Clause
+
+#[=======================================================================[.rst:
+FindPostgreSQL
+--------------
+
+Find the PostgreSQL installation.
+
+IMPORTED Targets
+^^^^^^^^^^^^^^^^
+
+.. versionadded:: 3.14
+
+This module defines :prop_tgt:`IMPORTED` target ``PostgreSQL::PostgreSQL``
+if PostgreSQL has been found.
+
+Result Variables
+^^^^^^^^^^^^^^^^
+
+This module will set the following variables in your project:
+
+``PostgreSQL_FOUND``
+  True if PostgreSQL is found.
+``PostgreSQL_LIBRARIES``
+  the PostgreSQL libraries needed for linking
+``PostgreSQL_INCLUDE_DIRS``
+  the directories of the PostgreSQL headers
+``PostgreSQL_LIBRARY_DIRS``
+  the link directories for PostgreSQL libraries
+``PostgreSQL_VERSION_STRING``
+  the version of PostgreSQL found
+``PostgreSQL_TYPE_INCLUDE_DIR``
+  the directories of the PostgreSQL server headers
+
+Components
+^^^^^^^^^^
+
+This module contains additional ``Server`` component, that forcibly checks
+for the presence of server headers. Note that ``PostgreSQL_TYPE_INCLUDE_DIR``
+is set regardless of the presence of the ``Server`` component in find_package call.
+
+#]=======================================================================]
+
+# ----------------------------------------------------------------------------
+# History:
+# This module is derived from the module originally found in the VTK source tree.
+#
+# ----------------------------------------------------------------------------
+# Note:
+# PostgreSQL_ADDITIONAL_VERSIONS is a variable that can be used to set the
+# version number of the implementation of PostgreSQL.
+# In Windows the default installation of PostgreSQL uses that as part of the path.
+# E.g C:\Program Files\PostgreSQL\8.4.
+# Currently, the following version numbers are known to this module:
+# "11" "10" "9.6" "9.5" "9.4" "9.3" "9.2" "9.1" "9.0" "8.4" "8.3" "8.2" "8.1" "8.0"
+#
+# To use this variable just do something like this:
+# set(PostgreSQL_ADDITIONAL_VERSIONS "9.2" "8.4.4")
+# before calling find_package(PostgreSQL) in your CMakeLists.txt file.
+# This will mean that the versions you set here will be found first in the order
+# specified before the default ones are searched.
+#
+# ----------------------------------------------------------------------------
+# You may need to manually set:
+#  PostgreSQL_INCLUDE_DIR  - the path to where the PostgreSQL include files are.
+#  PostgreSQL_LIBRARY_DIR  - The path to where the PostgreSQL library files are.
+# If FindPostgreSQL.cmake cannot find the include files or the library files.
+#
+# ----------------------------------------------------------------------------
+# The following variables are set if PostgreSQL is found:
+#  PostgreSQL_FOUND         - Set to true when PostgreSQL is found.
+#  PostgreSQL_INCLUDE_DIRS  - Include directories for PostgreSQL
+#  PostgreSQL_LIBRARY_DIRS  - Link directories for PostgreSQL libraries
+#  PostgreSQL_LIBRARIES     - The PostgreSQL libraries.
+#
+# The ``PostgreSQL::PostgreSQL`` imported target is also created.
+#
+# ----------------------------------------------------------------------------
+# If you have installed PostgreSQL in a non-standard location.
+# (Please note that in the following comments, it is assumed that <Your Path>
+# points to the root directory of the include directory of PostgreSQL.)
+# Then you have three options.
+# 1) After CMake runs, set PostgreSQL_INCLUDE_DIR to <Your Path>/include and
+#    PostgreSQL_LIBRARY_DIR to wherever the library pq (or libpq in windows) is
+# 2) Use CMAKE_INCLUDE_PATH to set a path to <Your Path>/PostgreSQL<-version>. This will allow find_path()
+#    to locate PostgreSQL_INCLUDE_DIR by utilizing the PATH_SUFFIXES option. e.g. In your CMakeLists.txt file
+#    set(CMAKE_INCLUDE_PATH ${CMAKE_INCLUDE_PATH} "<Your Path>/include")
+# 3) Set an environment variable called ${PostgreSQL_ROOT} that points to the root of where you have
+#    installed PostgreSQL, e.g. <Your Path>.
+#
+# ----------------------------------------------------------------------------
+
+if(CMAKE_VERSION VERSION_GREATER_EQUAL "3.20")
+  include("${CMAKE_ROOT}/Modules/FindPostgreSQL.cmake")
+  return()
+endif()
+
+cmake_policy(PUSH)
+cmake_policy(SET CMP0057 NEW) # if IN_LIST
+if(POLICY CMP0159)
+  cmake_policy(SET CMP0159 NEW)
+endif()
+
+set(PostgreSQL_INCLUDE_PATH_DESCRIPTION "top-level directory containing the PostgreSQL include directories. E.g /usr/local/include/PostgreSQL/8.4 or C:/Program Files/PostgreSQL/8.4/include")
+set(PostgreSQL_INCLUDE_DIR_MESSAGE "Set the PostgreSQL_INCLUDE_DIR cmake cache entry to the ${PostgreSQL_INCLUDE_PATH_DESCRIPTION}")
+set(PostgreSQL_LIBRARY_PATH_DESCRIPTION "top-level directory containing the PostgreSQL libraries.")
+set(PostgreSQL_LIBRARY_DIR_MESSAGE "Set the PostgreSQL_LIBRARY_DIR cmake cache entry to the ${PostgreSQL_LIBRARY_PATH_DESCRIPTION}")
+set(PostgreSQL_ROOT_DIR_MESSAGE "Set the PostgreSQL_ROOT system variable to where PostgreSQL is found on the machine E.g C:/Program Files/PostgreSQL/8.4")
+
+
+set(PostgreSQL_KNOWN_VERSIONS ${PostgreSQL_ADDITIONAL_VERSIONS}
+    "13" "12" "11" "10" "9.6" "9.5" "9.4" "9.3" "9.2" "9.1" "9.0" "8.4" "8.3" "8.2" "8.1" "8.0")
+
+# Define additional search paths for root directories.
+set( PostgreSQL_ROOT_DIRECTORIES
+   ENV PostgreSQL_ROOT
+   ${PostgreSQL_ROOT}
+)
+foreach(suffix ${PostgreSQL_KNOWN_VERSIONS})
+  if(WIN32)
+    list(APPEND PostgreSQL_LIBRARY_ADDITIONAL_SEARCH_SUFFIXES
+        "PostgreSQL/${suffix}/lib")
+    list(APPEND PostgreSQL_INCLUDE_ADDITIONAL_SEARCH_SUFFIXES
+        "PostgreSQL/${suffix}/include")
+    list(APPEND PostgreSQL_TYPE_ADDITIONAL_SEARCH_SUFFIXES
+        "PostgreSQL/${suffix}/include/server")
+  endif()
+  if(UNIX)
+    list(APPEND PostgreSQL_LIBRARY_ADDITIONAL_SEARCH_SUFFIXES
+        "postgresql${suffix}"
+        "pgsql-${suffix}/lib")
+    list(APPEND PostgreSQL_INCLUDE_ADDITIONAL_SEARCH_SUFFIXES
+        "postgresql${suffix}"
+        "postgresql/${suffix}"
+        "pgsql-${suffix}/include")
+    list(APPEND PostgreSQL_TYPE_ADDITIONAL_SEARCH_SUFFIXES
+        "postgresql${suffix}/server"
+        "postgresql/${suffix}/server"
+        "pgsql-${suffix}/include/server")
+  endif()
+endforeach()
+
+#
+# Look for an installation.
+#
+find_path(PostgreSQL_INCLUDE_DIR
+  NAMES libpq-fe.h
+  PATHS
+   # Look in other places.
+   ${PostgreSQL_ROOT_DIRECTORIES}
+  PATH_SUFFIXES
+    pgsql
+    postgresql
+    include
+    ${PostgreSQL_INCLUDE_ADDITIONAL_SEARCH_SUFFIXES}
+  # Help the user find it if we cannot.
+  DOC "The ${PostgreSQL_INCLUDE_DIR_MESSAGE}"
+)
+
+find_path(PostgreSQL_TYPE_INCLUDE_DIR
+  NAMES catalog/pg_type.h
+  PATHS
+   # Look in other places.
+   ${PostgreSQL_ROOT_DIRECTORIES}
+  PATH_SUFFIXES
+    postgresql
+    pgsql/server
+    postgresql/server
+    include/server
+    ${PostgreSQL_TYPE_ADDITIONAL_SEARCH_SUFFIXES}
+  # Help the user find it if we cannot.
+  DOC "The ${PostgreSQL_INCLUDE_DIR_MESSAGE}"
+)
+
+# The PostgreSQL library.
+set (PostgreSQL_LIBRARY_TO_FIND pq)
+# Setting some more prefixes for the library
+set (PostgreSQL_LIB_PREFIX "")
+if ( WIN32 )
+  set (PostgreSQL_LIB_PREFIX ${PostgreSQL_LIB_PREFIX} "lib")
+  set (PostgreSQL_LIBRARY_TO_FIND ${PostgreSQL_LIB_PREFIX}${PostgreSQL_LIBRARY_TO_FIND})
+endif()
+
+function(__postgresql_find_library _name)
+  find_library(${_name}
+   NAMES ${ARGN}
+   PATHS
+     ${PostgreSQL_ROOT_DIRECTORIES}
+   PATH_SUFFIXES
+     lib
+     ${PostgreSQL_LIBRARY_ADDITIONAL_SEARCH_SUFFIXES}
+   # Help the user find it if we cannot.
+   DOC "The ${PostgreSQL_LIBRARY_DIR_MESSAGE}"
+  )
+endfunction()
+
+# For compatibility with versions prior to this multi-config search, honor
+# any PostgreSQL_LIBRARY that is already specified and skip the search.
+if(PostgreSQL_LIBRARY)
+  set(PostgreSQL_LIBRARIES "${PostgreSQL_LIBRARY}")
+  get_filename_component(PostgreSQL_LIBRARY_DIR "${PostgreSQL_LIBRARY}" PATH)
+else()
+  __postgresql_find_library(PostgreSQL_LIBRARY_RELEASE ${PostgreSQL_LIBRARY_TO_FIND})
+  __postgresql_find_library(PostgreSQL_LIBRARY_DEBUG ${PostgreSQL_LIBRARY_TO_FIND}d)
+  include(SelectLibraryConfigurations)
+  select_library_configurations(PostgreSQL)
+  mark_as_advanced(PostgreSQL_LIBRARY_RELEASE PostgreSQL_LIBRARY_DEBUG)
+  if(PostgreSQL_LIBRARY_RELEASE)
+    get_filename_component(PostgreSQL_LIBRARY_DIR "${PostgreSQL_LIBRARY_RELEASE}" PATH)
+  elseif(PostgreSQL_LIBRARY_DEBUG)
+    get_filename_component(PostgreSQL_LIBRARY_DIR "${PostgreSQL_LIBRARY_DEBUG}" PATH)
+  else()
+    set(PostgreSQL_LIBRARY_DIR "")
+  endif()
+endif()
+
+if (PostgreSQL_INCLUDE_DIR)
+  # Some platforms include multiple pg_config.hs for multi-lib configurations
+  # This is a temporary workaround.  A better solution would be to compile
+  # a dummy c file and extract the value of the symbol.
+  file(GLOB _PG_CONFIG_HEADERS "${PostgreSQL_INCLUDE_DIR}/pg_config*.h")
+  foreach(_PG_CONFIG_HEADER ${_PG_CONFIG_HEADERS})
+    if(EXISTS "${_PG_CONFIG_HEADER}")
+      file(STRINGS "${_PG_CONFIG_HEADER}" pgsql_version_str
+           REGEX "^#define[\t ]+PG_VERSION_NUM[\t ]+.*")
+      if(pgsql_version_str)
+        string(REGEX REPLACE "^#define[\t ]+PG_VERSION_NUM[\t ]+([0-9]*).*"
+               "\\1" _PostgreSQL_VERSION_NUM "${pgsql_version_str}")
+        break()
+      endif()
+    endif()
+  endforeach()
+  if (_PostgreSQL_VERSION_NUM)
+    # 9.x and older encoding
+    if (_PostgreSQL_VERSION_NUM LESS 100000)
+      math(EXPR _PostgreSQL_major_version "${_PostgreSQL_VERSION_NUM} / 10000")
+      math(EXPR _PostgreSQL_minor_version "${_PostgreSQL_VERSION_NUM} % 10000 / 100")
+      math(EXPR _PostgreSQL_patch_version "${_PostgreSQL_VERSION_NUM} % 100")
+      set(PostgreSQL_VERSION_STRING "${_PostgreSQL_major_version}.${_PostgreSQL_minor_version}.${_PostgreSQL_patch_version}")
+      unset(_PostgreSQL_major_version)
+      unset(_PostgreSQL_minor_version)
+      unset(_PostgreSQL_patch_version)
+    else ()
+      math(EXPR _PostgreSQL_major_version "${_PostgreSQL_VERSION_NUM} / 10000")
+      math(EXPR _PostgreSQL_minor_version "${_PostgreSQL_VERSION_NUM} % 10000")
+      set(PostgreSQL_VERSION_STRING "${_PostgreSQL_major_version}.${_PostgreSQL_minor_version}")
+      unset(_PostgreSQL_major_version)
+      unset(_PostgreSQL_minor_version)
+    endif ()
+  else ()
+    foreach(_PG_CONFIG_HEADER ${_PG_CONFIG_HEADERS})
+      if(EXISTS "${_PG_CONFIG_HEADER}")
+        file(STRINGS "${_PG_CONFIG_HEADER}" pgsql_version_str
+             REGEX "^#define[\t ]+PG_VERSION[\t ]+\".*\"")
+        if(pgsql_version_str)
+          string(REGEX REPLACE "^#define[\t ]+PG_VERSION[\t ]+\"([^\"]*)\".*"
+                 "\\1" PostgreSQL_VERSION_STRING "${pgsql_version_str}")
+          break()
+        endif()
+      endif()
+    endforeach()
+  endif ()
+  unset(_PostgreSQL_VERSION_NUM)
+  unset(pgsql_version_str)
+endif()
+
+if("Server" IN_LIST PostgreSQL_FIND_COMPONENTS)
+  set(PostgreSQL_Server_FOUND TRUE)
+  if(NOT PostgreSQL_TYPE_INCLUDE_DIR)
+    set(PostgreSQL_Server_FOUND FALSE)
+  endif()
+endif()
+
+# Did we find anything?
+include(FindPackageHandleStandardArgs)
+find_package_handle_standard_args(PostgreSQL
+                                  REQUIRED_VARS PostgreSQL_LIBRARY PostgreSQL_INCLUDE_DIR
+                                  HANDLE_COMPONENTS
+                                  VERSION_VAR PostgreSQL_VERSION_STRING)
+set(PostgreSQL_FOUND  ${POSTGRESQL_FOUND})
+
+function(__postgresql_import_library _target _var _config)
+  if(_config)
+    set(_config_suffix "_${_config}")
+  else()
+    set(_config_suffix "")
+  endif()
+
+  set(_lib "${${_var}${_config_suffix}}")
+  if(EXISTS "${_lib}")
+    if(_config)
+      set_property(TARGET ${_target} APPEND PROPERTY
+        IMPORTED_CONFIGURATIONS ${_config})
+    endif()
+    set_target_properties(${_target} PROPERTIES
+      IMPORTED_LOCATION${_config_suffix} "${_lib}")
+  endif()
+endfunction()
+
+# Now try to get the include and library path.
+if(PostgreSQL_FOUND)
+  set(PostgreSQL_INCLUDE_DIRS ${PostgreSQL_INCLUDE_DIR})
+  if(PostgreSQL_TYPE_INCLUDE_DIR)
+    list(APPEND PostgreSQL_INCLUDE_DIRS ${PostgreSQL_TYPE_INCLUDE_DIR})
+  endif()
+  set(PostgreSQL_LIBRARY_DIRS ${PostgreSQL_LIBRARY_DIR})
+  if (NOT TARGET PostgreSQL::PostgreSQL)
+    add_library(PostgreSQL::PostgreSQL UNKNOWN IMPORTED)
+    set_target_properties(PostgreSQL::PostgreSQL PROPERTIES
+      INTERFACE_INCLUDE_DIRECTORIES "${PostgreSQL_INCLUDE_DIRS}")
+    __postgresql_import_library(PostgreSQL::PostgreSQL PostgreSQL_LIBRARY "")
+    __postgresql_import_library(PostgreSQL::PostgreSQL PostgreSQL_LIBRARY "RELEASE")
+    __postgresql_import_library(PostgreSQL::PostgreSQL PostgreSQL_LIBRARY "DEBUG")
+  endif ()
+endif()
+
+mark_as_advanced(PostgreSQL_INCLUDE_DIR PostgreSQL_TYPE_INCLUDE_DIR)
+
+cmake_policy(POP)