diff --git a/net/asterisk/patches/160-AST_EXT_TOOL_CHECK.patch b/net/asterisk/patches/160-AST_EXT_TOOL_CHECK.patch
new file mode 100644
index 0000000..97c9d35
--- /dev/null
+++ b/net/asterisk/patches/160-AST_EXT_TOOL_CHECK.patch
@@ -0,0 +1,22 @@
+--- a/autoconf/ast_ext_tool_check.m4
++++ b/autoconf/ast_ext_tool_check.m4
+@@ -8,13 +8,16 @@ AC_DEFUN([AST_EXT_TOOL_CHECK],
+ 	AC_REQUIRE([AST_PROG_SED])dnl
+ 	if test "x${PBX_$1}" != "x1" -a "${USE_$1}" != "no"; then
+ 		PBX_$1=0
+-		AC_PATH_TOOL(CONFIG_$1, $2, No, [${$1_DIR}/bin:$PATH])
++		if test "x${$1_DIR}" != "x"; then
++			AC_PATH_TOOL(CONFIG_$1, $2, No, [${$1_DIR}/bin:$PATH])
++		else
++			AC_PATH_TOOL(CONFIG_$1, $2, No, [$PATH])
++		fi
+ 		if test ! "x${CONFIG_$1}" = xNo; then
+ 			$1_INCLUDE=$(${CONFIG_$1} m4_default([$3],[--cflags]))
+-			$1_INCLUDE=$(echo ${$1_INCLUDE} | $SED -e "s|-I|-I${$1_DIR}|g" -e "s|-std=c99||g")
++			$1_INCLUDE=$(echo ${$1_INCLUDE} | $SED -e "s|-std=c99||g")
+ 
+ 			$1_LIB=$(${CONFIG_$1} m4_default([$4],[--libs]))
+-			$1_LIB=$(echo ${$1_LIB} | $SED -e "s|-L|-L${$1_DIR}|g")
+ 
+ 			m4_ifval([$5], [
+ 				saved_cppflags="${CPPFLAGS}"