please post config.log
you have a mysterious copy of libpng somewhere...

On Wed, Nov 20, 2019 at 9:36 PM Paul Masson <paulmas...@comcast.net> wrote:
>
> I do not have anaconda installed. Building from the git repository with no 
> package managers.
>
> On Wednesday, November 20, 2019 at 1:31:10 PM UTC-8, Dima Pasechnik wrote:
>>
>> Probably anaconda conflict, do you have pkg-config installed, so that
>>
>> pkg-config --libs libpng
>>
>> outputs a path to anaconda?
>>
>> I guess matplotlib does not use pkg-config, so it can't find libpng in
>> an unusual location.
>>
>> On Wed, Nov 20, 2019 at 7:57 PM Paul Masson <paulm...@comcast.net> wrote:
>> >
>> > On macOS 10.15.1, after "make distclean" I get
>> >
>> > The following package(s) may have failed to build (not necessarily
>> >
>> > during this run of 'make all-start'):
>> >
>> >
>> > * package: matplotlib-2.2.4.p0
>> >
>> >   log file: 
>> > /Users/Masson/Downloads/GitHub/sage/logs/pkgs/matplotlib-2.2.4.p0.log
>> >
>> >   build directory: 
>> > /Users/Masson/Downloads/GitHub/sage/local/var/tmp/sage/build/matplotlib-2.2.4.p0
>> >
>> >
>> > In the attached log, it says that libpng is not installed. I've never seen 
>> > this error before, but I didn't think I'd have to install anything 
>> > manually that was mandatory for the build. Thoughts?
>> >
>> >
>> > On Sunday, November 17, 2019 at 4:42:15 PM UTC-8, Volker Braun wrote:
>> >>
>> >> As always, you can get the latest beta version from the "develop" git 
>> >> branch. Alternatively, the self-contained source tarball is at 
>> >> http://www.sagemath.org/download-latest.html
>> >>
>> >> This is the first Python 3 beta, so incremental builds probably aren't 
>> >> going to work. Use "make distclean" or the appropriate configure flag to 
>> >> keep using Python 2 (noooo)
>> >>
>> >>
>> >> 232ae1bddc (tag: 9.0.beta6) Updated SageMath version to 9.0.beta6
>> >> 026a216fa4 Trac #28104: Openblas build failure
>> >> 1e7795c1f2 Trac #28726: py3: cysignals fails its test suite
>> >> c53e82c055 Trac #28734: a few miscellanous details
>> >> a55e518077 Trac #28721: Document sage-dist-helpers
>> >> c87212c10b Trac #28715: remove some deprecated stuff in combinat after 
>> >> 23319 and 15597
>> >> 2adaf8bc28 Trac #28686: Demote some optional packages to experimental
>> >> 381ddacd15 Trac #15077: Inconsistency in polynomial .reverse(n)
>> >> af4d15a8e1 Trac #28725: fix lawrence_extension and lawrence_polytope for 
>> >> backend field
>> >> a8e457e711 Trac #28719: remove deprecated function aliases
>> >> e46f2a5383 Trac #28717: some cleanup in __init__ files
>> >> 9101b22829 Trac #28709: Python executable in doctest/control.py
>> >> 6544bf8e40 Trac #28707: More control on the numerical ODE solver for 
>> >> integrated curves and geodesics
>> >> 50034a0ae9 Trac #28652: Rework the constructor of PermutationGroupElement
>> >> edc1360355 Trac #28606: CombinatorialPolyhedron: unbounded -> is_bounded
>> >> 3a35510660 Trac #28605: CombinatorialPolyhedron: replace attributes by 
>> >> methods
>> >> 133435b38d Trac #27302: Cubic Braid Groups
>> >> 8d41eaeed4 Trac #27089: CPLEXBackend.solver_parameter: Handle 
>> >> CPX_PARAMTYPE_LONG
>> >> eb5d0df260 Trac #25183: Bug in the associahedron object
>> >> 94b6adde10 Trac #24108: quadratic_form_from_invariants()
>> >> e9e14ad864 Trac #28730: cvxopt fails its test suite
>> >> a9146cd62b Trac #28714: clarify docstring of plot.colors.float_to_integer
>> >> f94189b015 Trac #28708: 5 cplex doctests failed in cplex_backend.pyx
>> >> 92a0045e31 Trac #28700: Fixing missing optional flag in base_QQ.py
>> >> 6c5f93dfb4 Trac #28689: py3: fix doctests with cbc
>> >> 3dd1d44175 Trac #28660: Make Python 3 the default
>> >> 0a86718461 Trac #28382: Correct types in cplex backend
>> >> 82b36b2ead Trac #27761: DES Block Cipher
>> >> 93db4cc438 (tag: 9.0.beta5) Updated SageMath version to 9.0.beta5
>> >>
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