Hello Sam,

* Sam Steingold wrote on Tue, Mar 16, 2010 at 08:04:36PM CET:
> warn-on-use.h: $(build_aux)/warn-on-use.h
>       $(AM_V_GEN)rm -f $...@-t $@ && \
>       sed -n -e '/^.ifndef/,$$p' \
>         < $(build_aux)/warn-on-use.h \
>         > $...@-t && \

> what is "$$p"?

Part of a sed command.  The sed script
  /^.ifndef/,$p

prints all lines from the one matching /^.ifndef/ to the last line.

Cheers,
Ralf


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