1AC_DEFUN([CHECK_ENABLE_OPTION],
2[dnl
3 dnl $1: option name
4 dnl $2: default value ("yes" or "no")
5 dnl $3: define $3 if yes
6  AC_ARG_ENABLE($1,
7    [AS_HELP_STRING([--enable-$1],
8      [turn on $1 (default is $2)])],
9    [],
10    [enable_$1=$2])
11  AM_CONDITIONAL([$3],[test "x${enable_$1}" == "xyes" ])
12  AS_IF([test "x${enable_$1}" = "xyes"],
13    [AC_DEFINE($3, 1, [Enable $1])]
14  )
15])
16