Rebuild for python39

[regro-cf-autotick-bot]

This PR has been triggered in an effort to update python39.

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[conda-forge-linter]

Hi! This is the friendly automated conda-forge-linting service.

I just wanted to let you know that I linted all conda-recipes in your PR (recipe) and found it was in an excellent condition.

[mbargull]

Blocked by https://github.com/conda-forge/libnetcdf-feedstock/pull/109.

[mbargull]

@conda-forge-admin, please restart ci

[grlee77]

@mbargull: It looks like the linux build is now working. There is still an issue with Tcl/Tk on OS X where it is using some headers from $PREFIX/include, but then system Tcl/Tk libraries from outside the conda environment. See the following excerpts from the build log.

Perhaps we can update the CMAKE command to help VTK find the expected versions.

2020-10-21T20:41:50.4079870Z -- Found Tclsh: $PREFIX/bin/tclsh (found version "8.6") 
2020-10-21T20:41:50.4248860Z -- Found TCL: /Applications/Xcode_11.7.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.9.sdk/usr/lib/libtcl.dylib  
2020-10-21T20:41:50.4254840Z -- Found TCLTK: /Applications/Xcode_11.7.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.9.sdk/usr/lib/libtcl.dylib  
2020-10-21T20:41:50.4259780Z -- Found TK: /Applications/Xcode_11.7.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.9.sdk/usr/lib/libtk.dylib  

2020-10-21T20:41:59.3554910Z // Path to a file.
2020-10-21T20:41:59.3555460Z TCL_INCLUDE_PATH:PATH=/Applications/Xcode_11.7.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.9.sdk/System/Library/Frameworks/Tcl.framework/Headers
2020-10-21T20:41:59.3555990Z 
2020-10-21T20:41:59.3556210Z // Path to a library.
2020-10-21T20:41:59.3556880Z TCL_LIBRARY:FILEPATH=/Applications/Xcode_11.7.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.9.sdk/usr/lib/libtcl.dylib
2020-10-21T20:41:59.3557370Z 
2020-10-21T20:41:59.3557590Z // Path to a program.
2020-10-21T20:41:59.3557920Z TCL_TCLSH:FILEPATH=$PREFIX/bin/tclsh
2020-10-21T20:41:59.3558170Z 

2020-10-21T20:41:59.3565810Z 
2020-10-21T20:41:59.3566070Z // Path to a file.
2020-10-21T20:41:59.3566640Z TK_INCLUDE_PATH:PATH=/Applications/Xcode_11.7.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.9.sdk/System/Library/Frameworks/Tk.framework/Headers
2020-10-21T20:41:59.3567150Z 
2020-10-21T20:41:59.3567430Z // The path to the Tk internal headers (tkMacOSXInt.h).
2020-10-21T20:41:59.3567840Z TK_INTERNAL_PATH:PATH=$PREFIX/include
2020-10-21T20:41:59.3568100Z 
2020-10-21T20:41:59.3568360Z // Path to a library.
2020-10-21T20:41:59.3568950Z TK_LIBRARY:FILEPATH=/Applications/Xcode_11.7.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.9.sdk/usr/lib/libtk.dylib

2020-10-21T21:05:59.3828040Z In file included from ../Rendering/Tk/vtkCocoaTkUtilities.mm:23:
2020-10-21T21:05:59.3829040Z In file included from $PREFIX/include/tkMacOSXInt.h:18:
2020-10-21T21:05:59.3831310Z In file included from $PREFIX/include/tkInt.h:19:
2020-10-21T21:05:59.3832100Z In file included from $PREFIX/include/tkPort.h:21:
2020-10-21T21:05:59.3832860Z $PREFIX/include/tk.h:21:3: error: Tk 8.6 must be compiled with tcl.h from Tcl 8.6 or better
2020-10-21T21:05:59.3833690Z #       error Tk 8.6 must be compiled with tcl.h from Tcl 8.6 or better
2020-10-21T21:05:59.3834310Z         ^
2020-10-21T21:05:59.3834770Z 1 error generated.
2020-10-21T21:05:59.3835240Z ninja: build stopped: subcommand failed.

[grlee77]

I will try adding

-DTCL_INCLUDE_PATH=${PREFIX}/include
-DTK_INCLUDE_PATH=${PREFIX}/include

to build.sh and see if that works unless there are other suggestions

[grlee77]

I had to explicitly provide the path to the conda-installed libtk/libtcl as in da481b6 for the OS X build to succeed. It all looks good now, so I will merge.