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@@ -377,6 +377,16 @@ input:name:output:description
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\&.o:cv:a.out:Conversion from Ack object to machine object
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.TE
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.in -2
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+.SH "ENVIRONMENT VARIABLES"
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+.IP ACKDIR
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+If set, this environment variable overrides ack's idea of its home
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+directory.
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+.IP ACKM
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+If set, this environment variable overrides ack's idea of the default
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+machine it compiles for.
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+.IP ACKFE
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+If set, this environment variable tells ack where to get the front-end
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+description file.
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.SH "SEE ALSO"
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.PD 0
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em_opt(6), em_ass(6), em_cg(6), ack.out(5)
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