-@samp{gl_M4_BASE(DIRECTORY)} to your @file{configure.ac}.
-Some modules also provide other files necessary
-for building. These files are copied into the directory specified
-by @samp{AC_CONFIG_AUX_DIR} in @file{configure.ac} or by the
-@code{--aux-dir=DIRECTORY} option. If neither is specified, the
-current directory is assumed.
+@samp{gl_M4_BASE(DIRECTORY)} to your @file{configure.ac}. Some
+modules also provide other files necessary for building. These files
+are copied into the directory specified by @samp{AC_CONFIG_AUX_DIR} in
+@file{configure.ac} or by the @code{--aux-dir=DIRECTORY} option. If
+neither is specified, the current directory is assumed. If a module
+is automatically added as a dependency is added, that you wish to
+avoid, you may use @code{--avoid=MODULE}, possibly several times. Of
+course, you will then need to implement the same interface as the
+removed module.