If I understand De Morgan correctly (had to use Wikipedia to brush of my Boolean Algebra), this conditional can be simplified from ! (a or !b) to !a and b. So perhaps it could be more naturally written like this.

ifndef val3
  ifdef val4

Ken

Boris Kolpackov wrote:

<[EMAIL PROTECTED]> writes:


But what do I do with something like

        #if ! ( (defined ( val3 ) ) || ( ! defined (val4) ) )
        key2 val5
        #endif


ifeq ($(val3)$(if $(val4),,t),)

-boris



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