On Sun, Nov 29, 2015 at 11:09 PM, Ludovic Courtès <ludo@gnu.org> wrote:
> Federico Beffa <beffa@ieee.org> skribis:
>
>> On Mon, Nov 16, 2015 at 1:57 PM, Ludovic Courtès <ludo@gnu.org> wrote:
>>> Federico Beffa <beffa@ieee.org> skribis:
>>>> Yes, given that the back-end currently used by matploblib doesn't
>>>> work, I would change that by using 'Tkinter'.
>>>>
>>>> Since you are at it, I would also change the default back-end by
>>>> changing 'GTK3Agg' to 'TkAgg' in the following snippet:
>>>>
>>>> (lambda (port)
>>>>   (format port "[rc_options]~%
>>>> backend = GTK3Agg~%")))))
>>>
>>> OTOH I see that Matploblib already depends on GTK+ 3.x and
>>> python-pygobject, so maybe it’s best to stick to GTK+ by default?
>>
>> Unfortunately, the back-ends based on GTK+ are broken and I didn't
>> manage to find how to fix the problem.
>> http://debbugs.gnu.org/cgi/bugreport.cgi?bug=20888
>>
>> That's why I'm looking forward to get Tkinter :-)
>
> Could you or someone else test this patch on current master?

It does not work. It can't find the tcl/tk header files:

...
                 tkagg: no  [The C/C++ header for Tk (tk.h) could not be
                        found.  You may need to install the development
                        package.]
...

With the attached patch it does find the headers, but then it fails at
link time.

...
g++ -pthread -shared
-Wl,-rpath=/gnu/store/cxrqlhbr6xqgi08x3amd0lvl6m7sxx57-python-3.4.3/lib
build/temp.linux-x86_64-3.4/src/agg_py_transforms.o
build/temp.linux-x86_64-3.4/src/_tkagg.o
build/temp.linux-x86_64-3.4/extern/agg24/src/agg_bezier_arc.o
build/temp.linux-x86_64-3.4/extern/agg24/src/agg_curves.o
build/temp.linux-x86_64-3.4/extern/agg24/src/agg_image_filters.o
build/temp.linux-x86_64-3.4/extern/agg24/src/agg_trans_affine.o
build/temp.linux-x86_64-3.4/extern/agg24/src/agg_vcgen_contour.o
build/temp.linux-x86_64-3.4/extern/agg24/src/agg_vcgen_dash.o
build/temp.linux-x86_64-3.4/extern/agg24/src/agg_vcgen_stroke.o
build/temp.linux-x86_64-3.4/extern/agg24/src/agg_vpgen_segmentator.o
build/temp.linux-x86_64-3.4/extern/CXX/IndirectPythonInterface.o
build/temp.linux-x86_64-3.4/extern/CXX/cxxsupport.o
build/temp.linux-x86_64-3.4/extern/CXX/cxx_extensions.o
build/temp.linux-x86_64-3.4/extern/CXX/cxxextensions.o
-L/gnu/store/ipsq9hlk6k0w1qfiw0y0a03bxkp2clhl-tcl-8.6.4/lib
-L/gnu/store/my9wgryzpfvksng6k7h87xz9rphdwddw-tk-8.6.4/lib
-L/usr/local/lib -L/usr/local/lib
-L/gnu/store/cxrqlhbr6xqgi08x3amd0lvl6m7sxx57-python-3.4.3/lib -ltcl
-ltk -lstdc++ -lm -lpython3.4m -o
build/lib.linux-x86_64-3.4/matplotlib/backends/_tkagg.cpython-34m.so
ld: cannot find -ltcl
ld: cannot find -ltk
collect2: error: ld returned 1 exit status
error: command 'g++' failed with exit status 1
phase `build' failed after 94.8 seconds
...

Looking into the failed build directory, it seems that PKG_CONFIG_PATH
is set correctly. Still, it doesn't get the correct flags.

Regards,
Fede