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From: Brian <brian199@comcast.net>
Newsgroups: comp.lang.tcl
Subject: Re: Can't build TclTLS 2.0b1
Date: Tue, 8 Jul 2025 20:36:14 -0500
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On 7/8/25 12:08 PM, Ralf Fassel wrote:
> * Ashok <apnmbx-public@yahoo.com>
> | So I'm guessing that /usr/include is already in the default system
> | include search path and therefore gets ignored when specified as the
> | -I
> | option. Additionally, /usr/local/include appears before /usr/include
> | in the default search path. That might explain what you are seeing.
> 
>    https://stackoverflow.com/questions/4980819/what-are-the-gcc-default-include-directories
> 
> suggests to use
> 
>    echo | gcc -xc -E -v -
> 
> to see the defaults plus any effect of environment variables like CPATH
> 
>    % echo | gcc -xc -E -v -
>    [...]
>      #include "..." search starts here:
>      #include <...> search starts here:
>       /usr/lib64/gcc/x86_64-suse-linux/7/include
>       /usr/local/include
>       /usr/lib64/gcc/x86_64-suse-linux/7/include-fixed
>       /usr/lib64/gcc/x86_64-suse-linux/7/../../../../x86_64-suse-linux/include
>       /usr/include
>      End of search list.
> 
> So indeed /usr/local/include is listed *before* /usr/include.
> 
> One could use -isystem/usr/include to change that order:
> 
>    % echo | gcc -isystem/usr/include -xc -E -v -
>    [...]
>      #include "..." search starts here:
>      #include <...> search starts here:
>       /usr/include
>       /usr/lib64/gcc/x86_64-suse-linux/7/include
>       /usr/local/include
>       /usr/lib64/gcc/x86_64-suse-linux/7/include-fixed
>       /usr/lib64/gcc/x86_64-suse-linux/7/../../../../x86_64-suse-linux/include
>      End of search list.
> 
> 
> HTH
> R'

Another option is to remove the standard include paths. So use the 
"-nostdinc" option and add back the "-I/usr/include" path too via the 
CFLAGS env var.

See https://commandlinefanatic.com/cgi-bin/showarticle.cgi?article=art026

The last option is just delete that old version of OpenSSL.