# Check for a package using $2-config. Similar to AST_EXT_LIB_CHECK,
# but use $2-config to determine cflags and libraries to use.
# $3 and $4 can be used to replace --cflags and --libs in the request

# AST_EXT_TOOL_CHECK([package], [tool name], [--cflags], [--libs], [includes], [expression])
AC_DEFUN([AST_EXT_TOOL_CHECK],
[
    if test "x${PBX_$1}" != "x1" -a "${USE_$1}" != "no"; then
	PBX_$1=0
	AC_CHECK_TOOL(CONFIG_$1, $2-config, No)
	if test ! "x${CONFIG_$1}" = xNo; then
	    if test x"$3" = x ; then A=--cflags ; else A="$3" ; fi
	    $1_INCLUDE=$(${CONFIG_$1} $A)
	    if test x"$4" = x ; then A=--libs ; else A="$4" ; fi
	    $1_LIB=$(${CONFIG_$1} $A)
	    if test x"$5" != x ; then
		saved_cppflags="${CPPFLAGS}"
		if test "x${$1_DIR}" != "x"; then
		    $1_INCLUDE="-I${$1_DIR}/include"
		fi
		CPPFLAGS="${CPPFLAGS} ${$1_INCLUDE}"

		saved_libs="${LIBS}"
		LIBS="${$1_LIB}"

		AC_LINK_IFELSE(
		    [ AC_LANG_PROGRAM( [ $5 ],
				       [ $6; ]
				       )],
		    [   PBX_$1=1
			AC_DEFINE([HAVE_$1], 1, [Define if your system has the $1 headers.])
		    ],
		    []
		)
		CPPFLAGS="${saved_cppflags}"
		LIBS="${saved_libs}"
	    else
		PBX_$1=1
		AC_DEFINE([HAVE_$1], 1, [Define if your system has the $1 libraries.])
	    fi
	fi
    fi
])