I've installed (or rather updated) libpng and am attempting to build sage 
again. I'll post again if there is still a complication. Thanks so much for 
your efforts!

On Friday, May 31, 2019 at 5:10:45 PM UTC-4, Dima Pasechnik wrote:
>
> On Fri, May 31, 2019 at 9:35 PM 'Justin C. Walker' via sage-devel 
> <sage-...@googlegroups.com <javascript:>> wrote: 
> > 
> > 
> > 
> > > On May 31, 2019, at 12:02 , Dima Pasechnik <dim...@gmail.com 
> <javascript:>> wrote: 
> > > 
> > > On Fri, May 31, 2019 at 5:49 PM Colby Kelln <cke...@umich.edu 
> <javascript:>> wrote: 
> > >> 
> > >> Hi, 
> > >> 
> > >> $ pkg-config --libs libpng 
> > >> 
> > >> -L/usr/local/Cellar/libpng/1.6.34/lib -lpng16 -lz 
> > >> 
> > >> 
> > >> and 
> > >> 
> > >> 
> > >> $ pkg-config --cflags libpng 
> > >> 
> > >> -I/usr/local/Cellar/libpng/1.6.34/include/libpng16 
> > > 
> > > Thanks. Can you just uninstall it? Then building Sage should work one 
> > > way or another. 
> > > IIRC, MacOS 10.13/14 has its own libpng, which is good enoug: e.g. 
> > > Homebrew links its libraries against the system's one, (And if memory 
> > > fails me here then Sage will biuld its own libpng) 
> > 
> > FWIW, I checked my 10.13/14 systems.  Neither has libpng (at least, in 
> /usr/lib).  Not sure what the implications areā€¦ 
> > 
> I probably confused it with ncurses. (Homebrew installs ncurses in 
> Cellar in order to avoid a conflict with the system - they call such 
> installs "keg-only"). If so, I don't see a reason libpng is not 
> installed in /usr/local/, where it would work just fine for Sage. 
>
> Colby, could you perhaps install libpng into the usual /usr/local, and 
> try again? Thanks. 
>
>
>
> > Justin 
> > 
> > -- 
> > Justin C. Walker, Curmudgeon at Large 
> > Institute for the Absorption of Federal Funds 
> > ----------- 
> > I'm beginning to like the cut of his jibberish. 
> > ----------- 
> > 
> > 
> > 
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