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dnl MPD_OPTIONAL_FUNC(name, 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([$3], 1, [Define to use $1])],
[AC_CHECK_FUNC([$2],
[AC_DEFINE([$3], 1, [Define to use $1])],)])
])
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