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 <[email protected]> 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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