Added my implementation of unixtime.

This implementation has very few reasonable code (call atol() and ctime()),
but has some nice standard program stuff (parse options, print help, ...).

Makefile.in

@@ -0,0 +1,72 @@
+# @Makefile.in@
+
+PREFIX  := @PREFIX@
+BINDIR  := @BINDIR@
+MAN1DIR := @MAN1DIR@
+
+MAIN := unixtime
+OBJS := unixtime.o
+#LIBS :=
+MAN1 := unixtime.1
+
+MANGZ := @MANGZ@
+ifeq ($(MANGZ), 1)
+ MAN1 := $(addsuffix .gz, $(MAN1))
+endif
+
+CC      := @CC@
+CP      := @CP@
+GZIP	:= @GZIP@
+INSTALL := @INSTALL@
+RM      := @RM@
+STRIP   := @STRIP@
+TAR     := @TAR@
+
+.PHONY: help strip install install-bin install-man install-man1 uninstall \
+	clean distclean mrproper dist
+.DEFAULT: $(MAIN)
+
+$(MAIN):	$(OBJS)
+ifeq (@STATIC@, 1)
+	$(CC) --static -g -o $(MAIN) $(LIBS) $(OBJS)
+else
+	$(CC) -g -o $(MAIN) $(LIBS) $(OBJS)
+endif
+
+%.o : %.c
+	$(CC) $(CFLAGS) $(CPPFLAGS) -c $< -o $@
+
+help:
+	@echo "There is no help."
+
+strip:	$(MAIN)
+	$(STRIP) $(MAIN)
+
+install:	install-bin install-man
+
+install-bin:	strip
+	$(INSTALL) $(MAIN) $(BINDIR)
+
+install-man:	install-man1
+
+install-man1:	$(MAN1)
+	$(INSTALL) $^ $(MAN1DIR)
+
+%.gz : %
+	$(GZIP) -c $< > $@
+
+uninstall:
+	-$(RM) $(BINDIR)/$(MAIN)
+	cd $(MAN1DIR) ; -$(RM) $(MAN1)
+
+clean:
+	$(RM) -f *.o $(MAIN)
+
+distclean:	clean
+	$(CP) Makefile.dist Makefile
+mrproper:	distclean
+
+dist:	distclean
+	cd .. ; $(TAR) -czf $(notdir $(PWD)).tar.gz $(notdir $(PWD))
+
+#end