I am trying to run the code from the "Simple Example" listed in the matplotlib-d package page[1] and am running into the following error:

$ dub build
Performing "debug" build using /usr/home/samir/dlang/dmd-2.082.0/freebsd/bin64/dmd for x86_64.
matplotlib-d 0.1.4: building configuration "library"...
Running pre-build commands...
Traceback (most recent call last):
File "/home/samir/.dub/packages/matplotlib-d-0.1.4/matplotlib-d/python/prebuild.py", line 37, in <module>
File "/home/samir/.dub/packages/matplotlib-d-0.1.4/matplotlib-d/python/prebuild.py", line 25, in gen_pyplot_functions
    import matplotlib.pyplot
ImportError: No module named matplotlib.pyplot
Command failed with exit code 1: python /home/samir/.dub/packages/matplotlib-d-0.1.4/matplotlib-d/python/prebuild.py /home/samir/.dub/packages/matplotlib-d-0.1.4/matplotlib-d

Some information about my environment:
$ uname -a
FreeBSD enterprise 11.2-RELEASE-p9 FreeBSD 11.2-RELEASE-p9 #0: Tue Feb 5 15:30:36 UTC 2019 r...@amd64-builder.daemonology.net:/usr/obj/usr/src/sys/GENERIC amd64
$ dmd --version
DMD64 D Compiler v2.082.0
Copyright (C) 1999-2018 by The D Language Foundation, All Rights Reserved written by Walter Bright
$ python3
Python 3.6.7 (default, Jan 10 2019, 01:15:48)
[GCC 4.2.1 Compatible FreeBSD Clang 6.0.0 (tags/RELEASE_600/final 326565)] on freebsd11 Type "help", "copyright", "credits" or "license" for more information.
import matplotlib

    "name": "matplotlib",
    "authors": [
        "User &"
    "description": "A minimal D application.",
    "copyright": "Copyright _ 2019, User &",
    "license": "proprietary",
    "dependencies": {
        "matplotlib-d": "~>0.1.4"

import std.math;
import std.range;
import std.algorithm;
import plt = matplotlibd.pyplot;

void main() {
 auto x = iota(0, 2.05, 0.05).map!(x => x * PI);
 auto y = x.map!(sin);

 plt.plot(x, y, "r-", ["label": "$y=sin(x)$"]);
 plt.xlim(0, 2 * PI);
 plt.ylim(-1, 1);

[1] http://code.dlang.org/packages/matplotlib-d

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