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Diff for /src/usr.bin/make/make.1 between version 1.68 and 1.69

version 1.68, 2007/05/31 19:20:13 version 1.69, 2007/07/08 17:44:20
Line 843 
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 .It Ic .undef Ar variable  .It Ic .undef Ar variable
 Un-define the specified global variable.  Un-define the specified global variable.
 Only global variables may be un-defined.  Only global variables may be un-defined.
   .It Ic .poison Ar variable
   Poison the specified global variable.
   Any further reference to
   .Ar variable
   will be flagged as an error.
   .It Xo
   .Ic \&.poison \&!defined
   .Po Ar variable
   .Pc
   .Xc
   It is an error to try to use the value of
   .Ar variable
   in a context  where it is not defined.
   .It Xo
   .Ic \&.poison empty
   .Po Ar variable
   .Pc
   .Xc
   It is an error to try to use the value of
   .Ar variable
   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
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Removed from v.1.68  
changed lines
  Added in v.1.69