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diff --git a/doc/Makefile.am b/doc/Makefile.am
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+help2man = @HELP2MAN@
+
+info_TEXINFOS = flex.texi
+dist_man_MANS = flex.1
+
+CLEANFILES = \
+ flex.aux \
+ flex.cp \
+ flex.cps \
+ flex.fn \
+ flex.fns \
+ flex.hk \
+ flex.hks \
+ flex.ky \
+ flex.log \
+ flex.op \
+ flex.ops \
+ flex.pg \
+ flex.toc \
+ flex.tp \
+ flex.tps \
+ flex.vr \
+ flex.vrs
+
+$(dist_man_MANS): $(top_srcdir)/configure.ac $(top_srcdir)/src/flex.skl $(top_srcdir)/src/options.c $(top_srcdir)/src/options.h
+ for i in $(dist_man_MANS) ; do \
+ $(help2man) --name='$(PACKAGE_NAME)' \
+ --section=`echo $$i | sed -e 's/.*\.\([^.]*\)$$/\1/'` \
+ $(top_srcdir)/src/flex$(EXEEXT) > $$i || rm -f $$i ; \
+ done