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while building frobme-1.3.4
$ configure 
error→ sed: file sedscr line 1: Unknown option to 's'

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sed N foo bar

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/foo/{ $!N; $!N; $!N; $!N; $!N; $!N; $!N; $!N; $!N }

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/foo/{ N;N;N;N;N;N;N;N;N; }

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Footnotes

(10)

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