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dnl MPD_OPTIONAL_FUNC(func, macro)
dnl
dnl Allow the user to enable or disable the use of a function. If the
dnl option is not specified, the function is auto-detected.
AC_DEFUN([MPD_OPTIONAL_FUNC], [
AC_ARG_ENABLE([$1],
AS_HELP_STRING([--enable-$1],
[use the function "$1()" (default: auto)]),
[test xenable_$1 = xyes && AC_DEFINE([$2], 1, [Define to use $1()])],
[AC_CHECK_FUNC([$1],
[AC_DEFINE([$2], 1, [Define to use $1()])],)])
])
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