PKG_CHECK_MODULES([libudev], [libudev >= 0],
[CFLAGS="$CFLAGS $libudev_CFLAGS"; LIBS="$LIBS $libudev_LIBS"],
[AC_MSG_ERROR([libudev.h not found])])
PKG_CHECK_MODULES([libudev], [libudev >= 0],
[CFLAGS="$CFLAGS $libudev_CFLAGS"; LIBS="$LIBS $libudev_LIBS"],
[AC_MSG_ERROR([libudev.h not found])])