pythonPackages.matplotlib: fix headless detection
The default backend is chosen based on the content of the $DISPLAY variable *and* a successfull call to libX11, loaded via dlopen(). The test fails because dlopen looks in /usr/lib and /lib, so matplotlib falls back to a headless backend. To reproduce try running: $ nix-shell -I nixpkgs=$PWD -p \ 'python3.withPackages (p: [ p.matplotlib ])' --run python >>> import matplotlib.pyplot as plt >>> assert plt.get_backend() == "TkAgg"
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@ -5,12 +5,18 @@
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, enableGhostscript ? true, ghostscript, gtk3
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, enableGtk3 ? false, cairo
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# darwin has its own "MacOSX" backend
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, enableTk ? !stdenv.isDarwin, tcl, tk, tkinter, libX11
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, enableTk ? !stdenv.isDarwin, tcl, tk, tkinter
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, enableQt ? false, pyqt5
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# required for headless detection
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, libX11, wayland
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, Cocoa
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, pythonOlder
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}:
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let
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interactive = enableTk || enableGtk3 || enableQt;
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in
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buildPythonPackage rec {
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version = "3.4.1";
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pname = "matplotlib";
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@ -62,8 +68,14 @@ buildPythonPackage rec {
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let
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tcl_tk_cache = ''"${tk}/lib", "${tcl}/lib", "${lib.strings.substring 0 3 tk.version}"'';
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in
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lib.optionalString enableTk
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"sed -i '/self.tcl_tk_cache = None/s|None|${tcl_tk_cache}|' setupext.py";
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lib.optionalString enableTk ''
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sed -i '/self.tcl_tk_cache = None/s|None|${tcl_tk_cache}|' setupext.py
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'' + lib.optionalString (stdenv.isLinux && interactive) ''
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# fix paths to libraries in dlopen calls (headless detection)
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substituteInPlace src/_c_internal_utils.c \
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--replace libX11.so.6 ${libX11}/lib/libX11.so.6 \
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--replace libwayland-client.so.0 ${wayland}/lib/libwayland-client.so.0
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'';
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# Matplotlib needs to be built against a specific version of freetype in
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# order for all of the tests to pass.
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