# - Try to find gps library
# Once done this will define
#
#  GPS_FOUND - system has gps
#  GPS_INCLUDE_DIR - the gps include directory
#  GPS_LIBRARY - Link this to use gps

#=============================================================================
# Copyright 2000-2009 Kitware, Inc., Insight Software Consortium
# Copyright 2006-2009 Kitware, Inc.
# Copyright 2006 Alexander Neundorf <neundorf@kde.org>
# Copyright 2010 David Register 
# Copyright 2017 Alexander Wolf
#
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#modification, are permitted provided that the following conditions
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IF (GPS_INCLUDE_DIR AND GPS_LIBRARY)
    SET(GPS_FIND_QUIETLY TRUE)
ENDIF (GPS_INCLUDE_DIR AND GPS_LIBRARY)

FIND_PATH(GPS_INCLUDE_DIR gps.h /usr/include /usr/include/gps /usr/local/include/gps /usr/local/include /opt/local/include /sw/include)

FIND_LIBRARY(GPS_LIBRARY NAMES gps PATH /usr/lib /usr/local/lib /opt/local/lib /sw/lib) 

IF (GPS_INCLUDE_DIR AND GPS_LIBRARY)
    SET(GPS_FOUND TRUE)
ENDIF (GPS_INCLUDE_DIR AND GPS_LIBRARY)

IF(GPS_INCLUDE_DIR)
    FILE(STRINGS ${GPS_INCLUDE_DIR}/gps.h _version_lines REGEX "GPSD_API_(MAJOR|MINOR)_VERSION")
    STRING(REGEX MATCH "MAJOR_VERSION[ \t]+([0-9]+)" _version_major ${_version_lines})
    SET(GPS_VERSION_MAJOR ${CMAKE_MATCH_1})
    STRING(REGEX MATCH "MINOR_VERSION[ \t]+([0-9]+)" _version_minor ${_version_lines})
    SET(GPS_VERSION_MINOR ${CMAKE_MATCH_1})
    SET(GPS_VERSION_STRING "${GPS_VERSION_MAJOR}.${GPS_VERSION_MINOR}")
ENDIF()

IF (GPS_FOUND)
    IF (NOT GPS_FIND_QUIETLY)
        MESSAGE(STATUS "Found GPS: ${GPS_LIBRARY}")
    ENDIF (NOT GPS_FIND_QUIETLY)
ELSE (GPS_FOUND)
    IF (GPS_FIND_REQUIRED)
        MESSAGE(FATAL_ERROR "Could not find GPS library")
    ENDIF (GPS_FIND_REQUIRED)
ENDIF (GPS_FOUND)