QGIS/cmake/FindLibZip.cmake

# CMake module to search for libzip
#
# Once done this will define
#
#  LIBZIP_FOUND - system has the zip library
#  LIBZIP_INCLUDE_DIRS - the zip include directories
#  LIBZIP_LIBRARY - Link this to use the zip library
#
# Copyright (c) 2017, Paul Blottiere, <paul.blottiere@oslandia.com>
# Copyright (c) 2017, Larry Shaffer, <lshaffer (at) boundlessgeo (dot) com>
#   Add support for finding zipconf.h in separate location, e.g. on macOS
#
# Redistribution and use is allowed according to the terms of the BSD license.
# For details see the accompanying COPYING-CMAKE-SCRIPTS file.

FIND_PATH(LIBZIP_INCLUDE_DIR
  zip.h
  "$ENV{LIB_DIR}/include"
  "$ENV{INCLUDE}"
  /usr/local/include
  /usr/include
)

FIND_PATH(LIBZIP_CONF_INCLUDE_DIR
  zipconf.h
  "$ENV{LIB_DIR}/include"
  "$ENV{LIB_DIR}/lib/libzip/include"
  "$ENV{LIB}/lib/libzip/include"
  /usr/local/lib/libzip/include
  /usr/lib/libzip/include
  /usr/local/include
  /usr/include
  "$ENV{INCLUDE}"
)

FIND_LIBRARY(LIBZIP_LIBRARY NAMES zip PATHS "$ENV{LIB_DIR}/lib" "$ENV{LIB}" /usr/local/lib /usr/lib )

INCLUDE(FindPackageHandleStandardArgs)
FIND_PACKAGE_HANDLE_STANDARD_ARGS(LibZip DEFAULT_MSG
                                  LIBZIP_LIBRARY LIBZIP_INCLUDE_DIR LIBZIP_CONF_INCLUDE_DIR)

SET(LIBZIP_INCLUDE_DIRS ${LIBZIP_INCLUDE_DIR} ${LIBZIP_CONF_INCLUDE_DIR})
MARK_AS_ADVANCED(LIBZIP_LIBRARY LIBZIP_INCLUDE_DIR LIBZIP_CONF_INCLUDE_DIR LIBZIP_INCLUDE_DIRS)

IF (LIBZIP_FOUND)
  MESSAGE(STATUS "Found libzip: ${LIBZIP_LIBRARY}")
ELSE (LIBZIP_FOUND)
  MESSAGE(FATAL_ERROR "Could not find libzip")
ENDIF (LIBZIP_FOUND)