PyCall build on TravisCI fails

Out of sudden my the build of our Julia project on TravisCI https://travis-ci.org/JuliaEnergy/PowerDynamics.jl/builds/598602707 fails, due to PyCall:
```
┌ Error: Error building `PyCall`:
│ PREFIX=/home/travis/.julia/conda/3
│ Unpacking payload ...
Collecting package metadata (current_repodata.json): ...working... done
│ Solving environment: ...working... done
│
│ ## Package Plan ##
│
│ environment location: /home/travis/.julia/conda/3
│
│ added / updated specs:
│ - _libgcc_mutex==0.1=main
│ - asn1crypto==0.24.0=py37_0
│ - bzip2==1.0.8=h7b6447c_0
│ - ca-certificates==2019.5.15=0
│ - certifi==2019.6.16=py37_0
│ - cffi==1.12.3=py37h2e261b9_0
│ - chardet==3.0.4=py37_1
│ - conda-package-handling==1.3.11=py37_0
│ - conda==4.7.10=py37_0
│ - cryptography==2.7=py37h1ba5d50_0
│ - idna==2.8=py37_0
│ - libarchive==3.3.3=h5d8350f_5
│ - libedit==3.1.20181209=hc058e9b_0
│ - libffi==3.2.1=hd88cf55_4
│ - libgcc-ng==9.1.0=hdf63c60_0
│ - libstdcxx-ng==9.1.0=hdf63c60_0
│ - libxml2==2.9.9=hea5a465_1
│ - lz4-c==1.8.1.2=h14c3975_0
│ - lzo==2.10=h49e0be7_2
│ - ncurses==6.1=he6710b0_1
│ - openssl==1.1.1c=h7b6447c_1
│ - pip==19.1.1=py37_0
│ - pycosat==0.6.3=py37h14c3975_0
│ - pycparser==2.19=py37_0
│ - pyopenssl==19.0.0=py37_0
│ - pysocks==1.7.0=py37_0
│ - python-libarchive-c==2.8=py37_11
│ - python==3.7.3=h0371630_0
│ - readline==7.0=h7b6447c_5
│ - requests==2.22.0=py37_0
│ - ruamel_yaml==0.15.46=py37h14c3975_0
│ - setuptools==41.0.1=py37_0
│ - six==1.12.0=py37_0
│ - sqlite==3.29.0=h7b6447c_0
│ - tk==8.6.8=hbc83047_0
│ - tqdm==4.32.1=py_0
│ - urllib3==1.24.2=py37_0
│ - wheel==0.33.4=py37_0
│ - xz==5.2.4=h14c3975_4
│ - yaml==0.1.7=had09818_2
│ - zlib==1.2.11=h7b6447c_3
│ - zstd==1.3.7=h0b5b093_0
│
│
│ The following NEW packages will be INSTALLED:
│
│ _libgcc_mutex pkgs/main/linux-64::_libgcc_mutex-0.1-main
│ asn1crypto pkgs/main/linux-64::asn1crypto-0.24.0-py37_0
│ bzip2 pkgs/main/linux-64::bzip2-1.0.8-h7b6447c_0
│ ca-certificates pkgs/main/linux-64::ca-certificates-2019.5.15-0
│ certifi pkgs/main/linux-64::certifi-2019.6.16-py37_0
│ cffi pkgs/main/linux-64::cffi-1.12.3-py37h2e261b9_0
│ chardet pkgs/main/linux-64::chardet-3.0.4-py37_1
│ conda pkgs/main/linux-64::conda-4.7.10-py37_0
│ conda-package-han~ pkgs/main/linux-64::conda-package-handling-1.3.11-py37_0
│ cryptography pkgs/main/linux-64::cryptography-2.7-py37h1ba5d50_0
│ idna pkgs/main/linux-64::idna-2.8-py37_0
│ libarchive pkgs/main/linux-64::libarchive-3.3.3-h5d8350f_5
│ libedit pkgs/main/linux-64::libedit-3.1.20181209-hc058e9b_0
│ libffi pkgs/main/linux-64::libffi-3.2.1-hd88cf55_4
│ libgcc-ng pkgs/main/linux-64::libgcc-ng-9.1.0-hdf63c60_0
│ libstdcxx-ng pkgs/main/linux-64::libstdcxx-ng-9.1.0-hdf63c60_0
│ libxml2 pkgs/main/linux-64::libxml2-2.9.9-hea5a465_1
│ lz4-c pkgs/main/linux-64::lz4-c-1.8.1.2-h14c3975_0
│ lzo pkgs/main/linux-64::lzo-2.10-h49e0be7_2
│ ncurses pkgs/main/linux-64::ncurses-6.1-he6710b0_1
│ openssl pkgs/main/linux-64::openssl-1.1.1c-h7b6447c_1
│ pip pkgs/main/linux-64::pip-19.1.1-py37_0
│ pycosat pkgs/main/linux-64::pycosat-0.6.3-py37h14c3975_0
│ pycparser pkgs/main/linux-64::pycparser-2.19-py37_0
│ pyopenssl pkgs/main/linux-64::pyopenssl-19.0.0-py37_0
│ pysocks pkgs/main/linux-64::pysocks-1.7.0-py37_0
│ python pkgs/main/linux-64::python-3.7.3-h0371630_0
│ python-libarchive~ pkgs/main/linux-64::python-libarchive-c-2.8-py37_11
│ readline pkgs/main/linux-64::readline-7.0-h7b6447c_5
│ requests pkgs/main/linux-64::requests-2.22.0-py37_0
│ ruamel_yaml pkgs/main/linux-64::ruamel_yaml-0.15.46-py37h14c3975_0
│ setuptools pkgs/main/linux-64::setuptools-41.0.1-py37_0
│ six pkgs/main/linux-64::six-1.12.0-py37_0
│ sqlite pkgs/main/linux-64::sqlite-3.29.0-h7b6447c_0
│ tk pkgs/main/linux-64::tk-8.6.8-hbc83047_0
│ tqdm pkgs/main/noarch::tqdm-4.32.1-py_0
│ urllib3 pkgs/main/linux-64::urllib3-1.24.2-py37_0
│ wheel pkgs/main/linux-64::wheel-0.33.4-py37_0
│ xz pkgs/main/linux-64::xz-5.2.4-h14c3975_4
│ yaml pkgs/main/linux-64::yaml-0.1.7-had09818_2
│ zlib pkgs/main/linux-64::zlib-1.2.11-h7b6447c_3
│ zstd pkgs/main/linux-64::zstd-1.3.7-h0b5b093_0
│
│
│ Preparing transaction: ...working... done
│ Executing transaction: ...working... WARNING conda.core.envs_manager:register_env(46): Unable to register environment. Path not writable or missing.
│ environment location: /home/travis/.julia/conda/3
│ registry file: /home/travis/.conda/environments.txt
│ done
│ installation finished.
│ Warning: 'defaults' already in 'channels' list, moving to the top
│ Collecting package metadata (current_repodata.json): ...working... done
│ Solving environment: ...working... done
│
│ ## Package Plan ##
│
│ environment location: /home/travis/.julia/conda/3
│
│ added / updated specs:
│ - conda
│
│
│ The following packages will be downloaded:
│
│ package | build
│ ---------------------------|-----------------
│ asn1crypto-1.0.1 | py37_0 161 KB
│ ca-certificates-2019.8.28 | 0 132 KB
│ certifi-2019.9.11 | py37_0 154 KB
│ chardet-3.0.4 | py37_1003 174 KB
│ conda-4.7.12 | py37_0 3.0 MB
│ conda-package-handling-1.6.0| py37h7b6447c_0 797 KB
│ openssl-1.1.1d | h7b6447c_2 2.5 MB
│ pysocks-1.7.1 | py37_0 30 KB
│ sqlite-3.30.0 | h7b6447c_0 1.9 MB
│ tqdm-4.36.1 | py_0 50 KB
│ ------------------------------------------------------------
│ Total: 8.9 MB
│
│ The following packages will be REMOVED:
│
│ bzip2-1.0.8-h7b6447c_0
│ libarchive-3.3.3-h5d8350f_5
│ libxml2-2.9.9-hea5a465_1
│ lz4-c-1.8.1.2-h14c3975_0
│ lzo-2.10-h49e0be7_2
│ pip-19.1.1-py37_0
│ python-libarchive-c-2.8-py37_11
│ setuptools-41.0.1-py37_0
│ wheel-0.33.4-py37_0
│ zstd-1.3.7-h0b5b093_0
│
│ The following packages will be UPDATED:
│
│ asn1crypto 0.24.0-py37_0 --> 1.0.1-py37_0
│ ca-certificates 2019.5.15-0 --> 2019.8.28-0
│ certifi 2019.6.16-py37_0 --> 2019.9.11-py37_0
│ chardet 3.0.4-py37_1 --> 3.0.4-py37_1003
│ conda 4.7.10-py37_0 --> 4.7.12-py37_0
│ conda-package-han~ 1.3.11-py37_0 --> 1.6.0-py37h7b6447c_0
│ openssl 1.1.1c-h7b6447c_1 --> 1.1.1d-h7b6447c_2
│ pysocks 1.7.0-py37_0 --> 1.7.1-py37_0
│ sqlite 3.29.0-h7b6447c_0 --> 3.30.0-h7b6447c_0
│ tqdm 4.32.1-py_0 --> 4.36.1-py_0
│
│
│ Preparing transaction: ...working... done
│ Verifying transaction: ...working... failed
│
│ RemoveError: 'setuptools' is a dependency of conda and cannot be removed from
│ conda's operating environment.
│
│ ┌ Info: No system-wide Python was found; got the following error:
│ │ Base.IOError("could not spawn setenv(`conda -c \"import distutils.sysconfig; print(distutils.sysconfig.get_config_var('VERSION'))\"`,[\"TRAVIS_OSX_IMAGE=\", \"DOCUMENTER_KEY=[secure]\", \"PATH=/home/travis/bin:/home/travis/.local/bin:/usr/local/lib/jvm/openjdk11/bin:/opt/pyenv/shims:/home/travis/.phpenv/shims:/home/travis/perl5/perlbrew/bin:/home/travis/.nvm/versions/node/v8.12.0/bin:/home/travis/.kiex/elixirs/elixir-1.7.4/bin:/home/travis/.kiex/bin:/home/travis/.rvm/gems/ruby-2.5.3/bin:/home/travis/.rvm/gems/ruby-2.5.3@global/bin:/home/travis/.rvm/rubies/ruby-2.5.3/bin:/home/travis/gopath/bin:/home/travis/.gimme/versions/go1.11.1.linux.amd64/bin:/usr/local/cmake-3.12.4/bin:/usr/local/clang-7.0.0/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/snap/bin:/opt/ghc/bin:/home/travis/.rvm/bin:/home/travis/.phpenv/bin:/opt/pyenv/bin:/home/travis/.yarn/bin:/home/travis/julia/bin:/home/travis/julia/bin\", \"_system_version=16.04\", \"TRAVIS_CABAL_DEFAULT=2.4\", \"TRAVIS_BRANCH=master\", \"OPENBLAS_MAIN_FREE=1\", \"TRAVIS_UID=2000\", \"TRAVIS_SUDO=true\", \"TRAVIS_ALLOW_FAILURE=false\", \"COMPOSER_NO_INTERACTION=1\", \"TRAVIS_TMPDIR=/tmp/tmp.OWjSFrXy1Y\", \"TRAVIS_JOB_NUMBER=459.1\", \"TRAVIS_PULL_REQUEST_SHA=\", \"TRAVIS_TIMER_ID=00ccac56\", \"TRAVIS_INIT=systemd\", \"MANPATH=/home/travis/.nvm/versions/node/v8.12.0/share/man:/home/travis/.kiex/elixirs/elixir-1.7.4/man:/home/travis/.rvm/rubies/ruby-2.5.3/share/man:/usr/local/cmake-3.12.4/man:/usr/local/clang-7.0.0/share/man:/usr/local/man:/usr/local/share/man:/usr/share/man:/home/travis/.rvm/man\", \"TRAVIS_BUILD_ID=598602707\", \"TRAVIS_PULL_REQUEST_SLUG=\", \"TRAVIS_SECURE_ENV_VARS=true\", \"MYSQL_UNIX_PORT=/var/run/mysqld/mysqld.sock\", \"TRAVIS_BUILD_NUMBER=459\", \"PYENV_ROOT=/opt/pyenv\", \"NVM_CD_FLAGS=\", \"ANSI_CLEAR=\\\\033[0K\", \"CONTINUOUS_INTEGRATION=true\", \"TRAVIS_TEST_RESULT=\", \"TRAVIS_BUILD_STAGE_NAME=\", \"RAILS_ENV=test\", \"TRAVIS_INTERNAL_RUBY_REGEX=^ruby-(2\\\\.[0-4]\\\\.[0-9]|1\\\\.9\\\\.3)\", \"MIX_ARCHIVES=/home/travis/.kiex/mix/elixir-1.7.4\", \"ANSI_GREEN=\\\\033[32;1m\", \"USER=travis\", \"PS4=+\", \"TRAVIS_STACK_FEATURES=basic couchdb disabled-ipv6 docker docker-compose elasticsearch firefox go-toolchain google-chrome jdk memcached mongodb mysql nodejs_interpreter perl_interpreter perlbrew phantomjs postgresql python_interpreter redis ruby_interpreter sqlite xserver\", \"GOPATH=/home/travis/gopath\", \"rvm_version=1.29.7 (latest)\", \"ELIXIR_VERSION=1.7.4\", \"JAVA_HOME=/usr/local/lib/jvm/openjdk11\", \"JRUBY_OPTS= --client -J-XX:+TieredCompilation -J-XX:TieredStopAtLevel=1 -J-Xss2m -Xcompile.invokedynamic=false\", \"TRAVIS_JULIA_VERSION=1.2\", \"APT_KEY_DONT_WARN_ON_DANGEROUS_USAGE=1\", \"TRAVIS_PULL_REQUEST=false\", \"TRAVIS_TIMER_START_TIME=1571224778665885138\", \"XDG_DATA_DIRS=/usr/local/share:/usr/share:/var/lib/snapd/desktop\", \"TRAVIS_PULL_REQUEST_BRANCH=\", \"TRAVIS_JOB_ID=598602708\", \"SHELL=/bin/bash\", \"TRAVIS_TAG=\", \"HISTFILESIZE=2000\", \"TRAVIS_ROOT=/\", \"RUBY_VERSION=ruby-2.5.3\", \"RACK_ENV=test\", \"PYTHON_CONFIGURE_OPTS=--enable-unicode=ucs4 --with-wide-unicode --enable-shared --enable-ipv6 --enable-loadable-sqlite-extensions --with-computed-gotos\", \"PYTHON_CFLAGS=-g -fstack-protector --param=ssp-buffer-size=4 -Wformat -Werror=format-security\", \"NVM_DIR=/home/travis/.nvm\", \"PS1=\\\${debian_chroot:+(\\\$debian_chroot)}\\\\u@\\\\h:\\\\w\\\\\\\$ \", \"NVM_BIN=/home/travis/.nvm/versions/node/v8.12.0/bin\", \"DEBIAN_FRONTEND=noninteractive\", \"SSH_CLIENT=10.24.6.19 40144 22\", \"TRAVIS_STACK_TIMESTAMP=2019-03-25 16:16:39 UTC\", \"SSH_TTY=/dev/pts/0\", \"DOCUMENTER_DEBUG=true\", \"TERM=xterm\", \"HOME=/home/travis\", \"PYTHONIOENCODING=UTF-8\", \"PYTHON=conda\", \"TRAVIS_APP_HOST=build.travis-ci.org\", \"HISTSIZE=1000\", \"rvm_path=/home/travis/.rvm\", \"TRAVIS_OS_NAME=linux\", \"TRAVIS_ENABLE_INFRA_DETECTION=true\", \"HAS_ANTARES_THREE_LITTLE_FRONZIES_BADGE=true\", \"LC_ALL=en_US.UTF-8\", \"rvm_prefix=/home/travis\", \"LC_CTYPE=en_US.UTF-8\", \"PERLBREW_SHELLRC_VERSION=0.86\", \"TZ=UTC\", \"_system_type=Linux\", \"GIT_ASKPASS=echo\", \"TRAVIS_ARCH=amd64\", \"LANG=en_US.UTF-8\", \"PYENV_SHELL=bash\", \"SHLVL=2\", \"LOGNAME=travis\", \"TRAVIS_FILTERED=redirect_io\", \"XDG_RUNTIME_DIR=/run/user/2000\", \"rvm_bin_path=/home/travis/.rvm/bin\", \"TRAVIS_APT_PROXY=http://apt.cache.travis-ci.com\", \"OLDPWD=/home/travis/build\", \"IRBRC=/home/travis/.rvm/rubies/ruby-2.5.3/.irbrc\", \"TRAVIS_REPO_SLUG=JuliaEnergy/PowerDynamics.jl\", \"RBENV_SHELL=bash\", \"GEM_PATH=/home/travis/.rvm/gems/ruby-2.5.3:/home/travis/.rvm/gems/ruby-2.5.3@global\", \"PAGER=cat\", \"TRAVIS_COMMIT=334ee88d39fe13c8da9293634b2f42d6b5b64984\", \"TRAVIS_STACK_NODE_ATTRIBUTES=/.node-attributes.yml\", \"TRAVIS_COMMIT_RANGE=50c5117adb06e196b32af18e6dbfa4520484ce50...334ee88d39fe13c8da9293634b2f42d6b5b64984\", \"ANSI_RED=\\\\033[31;1m\", \"_=/home/travis/julia/bin/julia\", \"ANSI_RESET=\\\\033[0m\", \"PERLBREW_HOME=/home/travis/.perlbrew\", \"PERLBREW_ROOT=/home/travis/perl5/perlbrew\", \"TRAVIS_PRE_CHEF_BOOTSTRAP_TIME=2019-03-25T16:16:25\", \"PWD=/home/travis/build/JuliaEnergy/PowerDynamics.jl\", \"TRAVIS_EVENT_TYPE=cron\", \"TRAVIS_GHC_DEFAULT=8.6.1\", \"TRAVIS_STACK_NAME=opal\", \"TRAVIS_GHC_ROOT=/opt/ghc\", \"MERB_ENV=test\", \"SSH_CONNECTION=10.24.6.19 40144 10.20.0.68 22\", \"LANGUAGE=en_US.UTF-8\", \"MY_RUBY_HOME=/home/travis/.rvm/rubies/ruby-2.5.3\", \"TRAVIS_COMMIT_MESSAGE=function added for finding valid conditions for perturbed systems wit… (#54)\\n\\n* function added for finding valid conditions for perturbed systems with mass matrices\\r\\n\\r\\n* removed commented code\\r\\n\\r\\n* ODEFunction taken from OrdinaryDiffEquations package\\r\", \"CI=true\", \"TRAVIS_CMD=julia --check-bounds=yes --color=yes --inline=no -e \\\"using Pkg; Pkg.test(coverage=true)\\\" && julia -e 'using Pkg; Pkg.add(\\\"Coverage\\\"); using Coverage; res=Codecov.process_folder(); Codecov.submit(res);'\", \"HISTCONTROL=ignoredups:ignorespace\", \"MAIL=/var/mail/travis\", \"GEM_HOME=/home/travis/.rvm/gems/ruby-2.5.3\", \"TRAVIS_STACK_JOB_BOARD_REGISTER=/.job-board-register.yml\", \"TRAVIS_BUILD_WEB_URL=https://travis-ci.org/JuliaEnergy/PowerDynamics.jl/builds/598602707\", \"XDG_SESSION_ID=2\", \"TRAVIS_STACK_LANGUAGES=__opal__ crystal csharp d dart elixir erlang haskell haxe julia perl perl6 r rust\", \"TRAVIS_INFRA=unknown\", \"TRAVIS_LANGUAGE=julia\", \"TRAVIS_JOB_WEB_URL=https://travis-ci.org/JuliaEnergy/PowerDynamics.jl/jobs/598602708\", \"_system_arch=x86_64\", \"TRAVIS_HOME=/home/travis\", \"TRAVIS_BUILD_DIR=/home/travis/build/JuliaEnergy/PowerDynamics.jl\", \"JULIA_LOAD_PATH=@:/tmp/jl_ONLJvI\", \"TRAVIS_JOB_NAME=\", \"TRAVIS=true\", \"ANSI_YELLOW=\\\\033[33;1m\", \"TRAVIS_CABAL_ROOT=/opt/cabal\", \"HAS_JOSH_K_SEAL_OF_APPROVAL=true\", \"_system_name=Ubuntu\", \"TRAVIS_DIST=xenial\", \"GOROOT=/home/travis/.gimme/versions/go1.11.1.linux.amd64\"]): no such file or directory (ENOENT)", -2)
│ └ using the Python distribution in the Conda package
│ [ Info: Downloading miniconda installer ...
│ [ Info: Installing miniconda ...
│ [ Info: Running `conda config --add channels defaults --file /home/travis/.julia/conda/3/condarc-julia.yml --force` in root environment
│ [ Info: Running `conda update -q -y conda` in root environment
│ ERROR: LoadError: failed process: Process(setenv(`/home/travis/.julia/conda/3/bin/conda update -q -y conda`,["TRAVIS_OSX_IMAGE=", "DOCUMENTER_KEY=[secure]", "PATH=/home/travis/bin:/home/travis/.local/bin:/usr/local/lib/jvm/openjdk11/bin:/opt/pyenv/shims:/home/travis/.phpenv/shims:/home/travis/perl5/perlbrew/bin:/home/travis/.nvm/versions/node/v8.12.0/bin:/home/travis/.kiex/elixirs/elixir-1.7.4/bin:/home/travis/.kiex/bin:/home/travis/.rvm/gems/ruby-2.5.3/bin:/home/travis/.rvm/gems/ruby-2.5.3@global/bin:/home/travis/.rvm/rubies/ruby-2.5.3/bin:/home/travis/gopath/bin:/home/travis/.gimme/versions/go1.11.1.linux.amd64/bin:/usr/local/cmake-3.12.4/bin:/usr/local/clang-7.0.0/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/snap/bin:/opt/ghc/bin:/home/travis/.rvm/bin:/home/travis/.phpenv/bin:/opt/pyenv/bin:/home/travis/.yarn/bin:/home/travis/julia/bin:/home/travis/julia/bin", "_system_version=16.04", "TRAVIS_CABAL_DEFAULT=2.4", "TRAVIS_BRANCH=master", "OPENBLAS_MAIN_FREE=1", "TRAVIS_UID=2000", "TRAVIS_SUDO=true", "TRAVIS_ALLOW_FAILURE=false" … "TRAVIS_BUILD_DIR=/home/travis/build/JuliaEnergy/PowerDynamics.jl", "JULIA_LOAD_PATH=@:/tmp/jl_ONLJvI", "TRAVIS_JOB_NAME=", "TRAVIS=true", "ANSI_YELLOW=\\033[33;1m", "TRAVIS_CABAL_ROOT=/opt/cabal", "HAS_JOSH_K_SEAL_OF_APPROVAL=true", "_system_name=Ubuntu", "TRAVIS_DIST=xenial", "GOROOT=/home/travis/.gimme/versions/go1.11.1.linux.amd64"]), ProcessExited(1)) [1]
│
│ Stacktrace:
│ [1] pipeline_error at ./process.jl:813 [inlined]
│ [2] #run#536(::Bool, ::typeof(run), ::Cmd) at ./process.jl:728
│ [3] run(::Cmd) at ./process.jl:726
│ [4] runconda(::Cmd, ::String) at /home/travis/.julia/packages/Conda/kLXeC/src/Conda.jl:113
│ [5] runconda(::Cmd) at /home/travis/.julia/packages/Conda/kLXeC/src/Conda.jl:111
│ [6] _install_conda(::String, ::Bool) at /home/travis/.julia/packages/Conda/kLXeC/src/Conda.jl:172
│ [7] _install_conda(::String) at /home/travis/.julia/packages/Conda/kLXeC/src/Conda.jl:152
│ [8] runconda(::Cmd, ::String) at /home/travis/.julia/packages/Conda/kLXeC/src/Conda.jl:111
│ [9] #add#1(::String, ::typeof(Conda.add), ::String, ::String) at /home/travis/.julia/packages/Conda/kLXeC/src/Conda.jl:184
│ [10] add(::String, ::String) at /home/travis/.julia/packages/Conda/kLXeC/src/Conda.jl:183 (repeats 2 times)
│ [11] top-level scope at /home/travis/.julia/packages/PyCall/ttONZ/deps/build.jl:84
│ [12] include at ./boot.jl:328 [inlined]
│ [13] include_relative(::Module, ::String) at ./loading.jl:1094
│ [14] include(::Module, ::String) at ./Base.jl:31
│ [15] include(::String) at ./client.jl:431
│ [16] top-level scope at none:5
│ in expression starting at /home/travis/.julia/packages/PyCall/ttONZ/deps/build.jl:43
└ @ Pkg.Operations /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v1.2/Pkg/src/backwards_compatible_isolation.jl:647
ERROR: LoadError: LoadError: PyCall not properly installed. Please run Pkg.build("PyCall")
```