Using --enable-debug and defining a macro from it...?

[Matthew Woehlke]

(If this isn't the place for 'how do I...?' questions, please re-direct 
me, but I do see it isn't the -bugs list.)

First off, I have a very skeleton configure.in (see below). How do I add 
'--enable-debug' to this? (I see AC_ARG_ENABLE, but is there not a 
standard one for debug? I can't find one, but it seems to be a standard.)

Second, I want to add a define to config.h based on the value of 
--enable-debug. How do I do this?

====
AC_INIT(<...>)

AM_CONFIG_HEADER(config.h)
AM_INIT_AUTOMAKE(<pkg>, 0.1)

AC_LANG_CPLUSPLUS
AC_PROG_CC
AC_PROG_CXX
AC_PROG_RANLIB
AC_PROG_INSTALL

AC_OUTPUT(Makefile src/Makefile <...>)
====

--
Matthew
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