diff --git a/autoconf/ast_ext_tool_check.m4 b/autoconf/ast_ext_tool_check.m4
index 8cd30407f3..16e95c49f0 100644
--- a/autoconf/ast_ext_tool_check.m4
+++ b/autoconf/ast_ext_tool_check.m4
@@ -7,7 +7,7 @@ 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, No)
+	AC_PATH_TOOL(CONFIG_$1, $2, No, [${$1_DIR}/bin:$PATH])
 	if test ! "x${CONFIG_$1}" = xNo; then
 	    if test x"$3" = x ; then A=--cflags ; else A="$3" ; fi
 	    $1_INCLUDE=$(${CONFIG_$1} $A)