Found the root cause for this. I relay it here in case it helps anyone else. 

Normally, Tcl.framework is over at /System/Library and 
System/Library/Frameworks. In one of my Macs, some version of it was found in 
/Library/Framework. I suspect placed there by some installer. Removing it from 
/Library/Frameworks fixed the build problem. 

-Arman


> On Nov 3, 2020, at 1:19 PM, Arman Garakani <[email protected]> wrote:
> 
> In file included from /Library/Frameworks/Tcl.framework/Headers/png.h:12:
> /Library/Frameworks/Tcl.framework/Headers/pngtclDecls.h:31:10: fatal error: 
> '../compat/libpng/png.h' file not found
> #include "../compat/libpng/png.h"
>          ^~~~~~~~~~~~~~~~~~~~~~~~
> 1 error generated.
> 
> Included from /src/ico.imageio/icoinput.cpp:9:
> 
> Tcl.framework is a mess on macOS 
> 
> Any hints / ideas 
> 
> 
> Thanks
> 
> -Arman
> 

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