On Fri, May 31, 2019 at 9:35 PM 'Justin C. Walker' via sage-devel
<sage-devel@googlegroups.com> wrote:
>
>
>
> > On May 31, 2019, at 12:02 , Dima Pasechnik <dimp...@gmail.com> wrote:
> >
> > On Fri, May 31, 2019 at 5:49 PM Colby Kelln <cke...@umich.edu> 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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