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17.5.2 Changed Makefiles
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.
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