Properly autotoolize package.

Use automake rather than hand-tailor a Makefile.in that has a few mistakes
in it.

Make it possible to disable knockd at ./configure time.

Fail if knockd is to be built and libpcap is not found.

Remove all checks that were not used.

Ignore extra files.

.gitignore

@@ -0,0 +1,20 @@
+*.o
+*~
+.deps
+/Makefile
+/Makefile.in
+/aclocal.m4
+/autom4te.cache/
+/config.h
+/config.h.in
+/config.log
+/config.status
+/configure
+/depcomp
+/doc/*.1
+/install-sh
+/knock
+/knock-*.tar.*
+/knockd
+/missing
+/stamp-h1

Makefile.am

@@ -0,0 +1,21 @@
+AM_CFLAGS=-g -Wall -pedantic -fno-exceptions
+
+bin_PROGRAMS = knock
+
+man_MANS = doc/knock.1
+
+if BUILD_KNOCKD
+sbin_PROGRAMS = knockd
+man_MANS += doc/knockd.1
+sysconf_DATA = knockd.conf
+endif
+
+dist_doc_DATA = README TODO ChangeLog COPYING
+
+knock_SOURCES = src/knock.c
+knockd_SOURCES = src/knockd.c src/list.c src/list.h
+
+%.1: %.1.in
+	sed -e "s/#VERSION#/$(VERSION)/" $< > $@
+
+EXTRA_DIST = doc/knock.1 doc/knock.1.in doc/knockd.1 doc/knockd.1.in knockd.conf