pip3 install -r requirements.txt)

[arssh70]

after I run this (pip3 install -r requirements.txt) I got this error:

ERROR: Command errored out with exit status 1:
 command: /usr/bin/python3 -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/tmp/pip-install-lx3f9sv0/matplotlib/setup.py'"'"'; __file__='"'"'/tmp/pip-install-lx3f9sv0/matplotlib/setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' egg_info --egg-base /tmp/pip-install-lx3f9sv0/matplotlib/pip-egg-info
     cwd: /tmp/pip-install-lx3f9sv0/matplotlib/
Complete output (48 lines):
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/tmp/pip-install-lx3f9sv0/matplotlib/setup.py", line 170, in <module>
    msg = pkg.install_help_msg()
  File "/tmp/pip-install-lx3f9sv0/matplotlib/setupext.py", line 539, in install_help_msg
    release = platform.linux_distribution()[0].lower()
AttributeError: module 'platform' has no attribute 'linux_distribution'
============================================================================
Edit setup.cfg to change the build options

BUILDING MATPLOTLIB
            matplotlib: yes [3.0.0]
                python: yes [3.8.5 (default, Jan 27 2021, 15:41:15)  [GCC
                        9.3.0]]
              platform: yes [linux]

REQUIRED DEPENDENCIES AND EXTENSIONS
                 numpy: yes [version 1.20.1]
      install_requires: yes [handled by setuptools]
                libagg: yes [pkg-config information for 'libagg' could not
                        be found. Using local copy.]
              freetype: no  [The C/C++ header for freetype2 (ft2build.h)
                        could not be found.  You may need to install the
                        development package.]
                   png: no  [pkg-config information for 'libpng' could not
                        be found.]
                 qhull: yes [pkg-config information for 'libqhull' could not
                        be found. Using local copy.]

OPTIONAL SUBPACKAGES
           sample_data: yes [installing]
              toolkits: yes [installing]
                 tests: no  [skipping due to configuration]
        toolkits_tests: no  [skipping due to configuration]

OPTIONAL BACKEND EXTENSIONS
                   agg: yes [installing]
                 tkagg: yes [installing; run-time loading from Python Tcl /
                        Tk]
                macosx: no  [Mac OS-X only]
             windowing: no  [Microsoft Windows only]

OPTIONAL PACKAGE DATA
                  dlls: no  [skipping due to configuration]

============================================================================
                        * The following required packages can not be built:
                        * freetype, png
----------------------------------------

ERROR: Command errored out with exit status 1: python setup.py egg_info Check the logs for full command output.