For each primary, there is one additional variable named by prefixing
‘EXTRA_’ to the primary name. This variable contains a list of
the objects that may or may not be built, depending on what
The author of Makefile.am must use this variable if there are objects
like these, so that Automake can
generate a Makefile.in that will work in all cases.
cpio decides at configure time which programs
should be built. Some of the programs are installed in
and some are installed in
EXTRA_PROGRAMS = mt rmt bin_PROGRAMS = cpio pax sbin_PROGRAMS = $(MORE_PROGRAMS)
Defining a primary without a prefix as a variable, e.g., ‘PROGRAMS’, is an error.