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18.5.2 Changed Makefiles

Add ‘@CFLAGS@’, ‘@CPPFLAGS@’, and ‘@LDFLAGS@’ in your ‘’ 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 ‘’:

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.

This document was generated on April 26, 2012 using texi2html 5.0.

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