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Diff for /src/usr.bin/make/make.1 between version 1.69 and 1.70

version 1.69, 2007/07/08 17:44:20 version 1.70, 2007/07/09 14:47:29
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 Only global variables may be un-defined.  Only global variables may be un-defined.
 .It Ic .poison Ar variable  .It Ic .poison Ar variable
 Poison the specified global variable.  Poison the specified global variable.
 Any further reference to  Any further reference to
 .Ar variable  .Ar variable
 will be flagged as an error.  will be flagged as an error.
 .It Xo  .It Ic .poison !defined Pq Ar variable
 .Ic \&.poison \&!defined  
 .Po Ar variable  
 .Pc  
 .Xc  
 It is an error to try to use the value of  It is an error to try to use the value of
 .Ar variable  .Ar variable
 in a context  where it is not defined.  in a context where it is not defined.
 .It Xo  .It Ic .poison empty Pq Ar variable
 .Ic \&.poison empty  
 .Po Ar variable  
 .Pc  
 .Xc  
 It is an error to try to use the value of  It is an error to try to use the value of
 .Ar variable  .Ar variable
 in a context  where it is not defined or empty.  in a context where it is not defined or empty.
 .It Xo  .It Xo
 .Ic \&.if  .Ic \&.if
 .Oo \&! Oc Ns Ar expression  .Oo \&! Oc Ns Ar expression
Legend:
Removed from v.1.69  
changed lines
  Added in v.1.70