Apologies for this dumb question but I have difficulty understanding how the GNU Autotools work but reckon my understanding will improve with some pratical exercises. What I would like to do is to attempt to retrofit a check for '--with-regex' into an old version of diff. From what I have read this check is enabled by the use of regex.m4 by including AM_WITH_REGEX into configure.in. Would anything else be required?
I notice that this is an automake macro, but the rest are autoconf macros so would it be recognised by autoconf or do I need to run automake first? There is no Makefile.am in this package. Do I need to create one? -- John
