* src/Makefile.am (bin_PROGRAMS): Add egrep, fgrep.
(bin_SCRIPTS): Remove it.
(grep_SOURCES): Move searchutils.c, dfa.c, dfasearch.c, kwset.c,
kwsearch.c, pcresearch.c here to libgrep_a_SOURCES.
(egrep_SOURCES, fgrep_SOURCES): New macro.
(noinst_LIBRARIES): Add libgrep.a.
(libgrep_a_SOURCES): Move searchutils.c, dfa.c, dfasearch.c, kwset.c,
kwsearch.c, pcresearch.c here from grep_SOURCES.
(LDADD): Add libgrep.a.
(egrep, fgrep): Use rule of grep.
(CLEANFILES): Remove macro.
* src/grep.c (SELECTED_MATCHER, DEFAULT_MATCHER): New macro.
(do_execute, usage, matchers, main): Use them.
* src/egrep.c: Define SELECTED_MATCHER macro for egrep.
* src/fgrep.c: Define SELECTED_MATCHER macro for fgrep.
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