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aclocal

aclocal is part of the automake package.
The command places the macros used in the configure.ac and Makefile.am from system wide definitions and puts the in a local file (directory???) named aclocal.m4. This makes it possible to move the code to a different machine.
aclocal produces
  • autom4te.cache
  • aclocal.m4
aclocal will probably disappear because autoconf will take over its functionality.

Options

-I

The -I option is for example used when the m4-macros reside in a m4 subdirectory.