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/usr/share/doc/mate-common/usage.txt is in mate-common 1.12.0-1.

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This module contains various files needed to bootstrap MATE modules
built from git.  It contains the following components:
 1. A common "autogen.sh" script that can be used to configure a
    source directory checked out from git.
 2. Some commonly used macros (quite a small set these days -- macros
    should be packaged with their respective modules).
 3. Some files used to build user documentation.

To make use of the common autogen script, create a stub autogen.sh
script in your module. See the example script in autogen.sh.example
file in mate-common documentation folder.

Then put the following in your configure.ac or configure.in file:
  MATE_COMMON_INIT

This macro is equivalent to the following two lines (which you can use
instead if you don't want to depend on mate-common macros):
  AC_SUBST([ACLOCAL_AMFLAGS], ["\${ACLOCAL_FLAGS}"])

Or if you are using the AC_CONFIG_MACRO_DIR macro:
  AC_SUBST([ACLOCAL_AMFLAGS], ["-I $ac_macro_dir \${ACLOCAL_FLAGS}"])

This will make sure that autoconf macros will be found when you
rebuild the package without rerunning autogen.sh.