File: autoconf.info,  Node: Changed Makefiles,  Next: Changed Macros,  Prev: Changed File Names,  Up: Autoconf 1

18.5.2 Changed Makefiles
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Add ‘@CFLAGS@’, ‘@CPPFLAGS@’, and ‘@LDFLAGS@’ in your ‘Makefile.in’
files, so they can take advantage of the values of those variables in
the environment when ‘configure’ is run.  Doing this isn't necessary,
but it's a convenience for users.

   Also add ‘@configure_input@’ in a comment to each input file for
‘AC_OUTPUT’, so that the output files contain a comment saying they were
produced by ‘configure’.  Automatically selecting the right comment
syntax for all the kinds of files that people call ‘AC_OUTPUT’ on became
too much work.

   Add ‘config.log’ and ‘config.cache’ to the list of files you remove
in ‘distclean’ targets.

   If you have the following in ‘Makefile.in’:

     prefix = /usr/local
     exec_prefix = $(prefix)

you must change it to:

     prefix = @prefix@
     exec_prefix = @exec_prefix@

The old behavior of replacing those variables without ‘@’ characters
around them has been removed.