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Using and detecting environment variables as flags

From: John Ling
Subject: Using and detecting environment variables as flags
Date: Tue, 25 May 2004 10:49:31 -0700
User-agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.5) Gecko/20031013 Thunderbird/0.3

Hello, I want to be able to read/check the value of an environment variable in my This would be a variable that I set as part of the an [action-if-found] in the AC_SEARCH_LIBS method, that I set in

How do I reference such a variable?

In addition, depending on the value of this variable, I then want to pass a signal from my to yet another Makefile which is called from This signal is to tell the second Makefile to add an -lz in its LIBS definition.

How do I do this?  In what way can I send such a flag/signal?

Thank You,

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