If I want to output brackets within an AS_HELP_STRING argument, there currently need to be quite a number of brackets :) Now my question is, is this subject to change, do I use them in the wrong way (in which case I would suggest to improve documentation) or can I hope all future versions of autoconf will handle the following correctly: AC_INIT AC_ARG_ENABLE([foo], AS_HELP_STRING([[--enable-foo[[[[=in brackets]]]]]], [description]), [:],[:]) AC_MSG_NOTICE([[foo [in bracket]]]) AC_OUTPUT Same with AC_HELP_STRING and autoconf-2.57. Regards, Ralf