Re: Using and detecting environment variables as flags

[Bruce Korb]

John Ling wrote:
> 
> Hello, I want to be able to read/check the value of an environment
> variable in my Makefile.am.  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
> configure.ac.
> 
> 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 Makefile.am to yet another Makefile which is
> called from Makefile.am.  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?

What is the real problem you are trying to solve?  Normally, autoconf
results get stored into substitution strings that wind up as
Makefile macros and set appropriately in the derived Makefile.