我从github下载了一个repo，并试图在venv中安装需求。它告诉我缺少freetype和libpng库，所以我去网站上安装了它们。然而我还是被告知缺少这两个库。(当然是在重启之后)
这是日志中的错误。
Collecting matplotlib==2.2.2
Using cached matplotlib-2.2.2.tar.gz (37.3 MB)
ERROR: Command errored out with exit status 1:
command: 'c:\programming\python\example programs\deepfake\venv\scripts\python.exe' -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'C:\\Users\\garym\\AppData\\Local\\Temp\\pip-install-ppn3h81t\\matplotlib\\setup.py'"'"'; __file__='"'"'C:\\Users\\garym\\AppData\\Local\\Temp\\pip-install-ppn3h81t\\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 'C:\Users\garym\AppData\Local\Temp\pip-install-ppn3h81t\matplotlib\pip-egg-info'
cwd: C:\Users\garym\AppData\Local\Temp\pip-install-ppn3h81t\matplotlib\
Complete output (61 lines):
============================================================================
Edit setup.cfg to change the build options
BUILDING MATPLOTLIB
matplotlib: yes [2.2.2]
python: yes [3.8.0 (tags/v3.8.0:fa919fd, Oct 14 2019,
19:21:23) [MSC v.1916 32 bit (Intel)]]
platform: yes [win32]
REQUIRED DEPENDENCIES AND EXTENSIONS
numpy: yes [not found. pip may install it below.]
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 freetype
(freetype2\ft2build.h) could not be found. You may
need to install the development package.]
png: no [The C/C++ header for png (png.h) could not be
found. You may need to install the development
package.]
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
macosx: no [Mac OS-X only]
qt5agg: no [PySide2 not found; PyQt5 not found]
qt4agg: no [PySide not found; PyQt4 not found]
gtk3agg: no [Requires pygobject to be installed.]
gtk3cairo: no [Requires cairocffi or pycairo to be installed.]
gtkagg: no [Requires pygtk]
tkagg: yes [installing; run-time loading from Python Tcl /
Tk]
wxagg: no [requires wxPython]
gtk: no [Requires pygtk]
agg: yes [installing]
cairo: no [cairocffi or pycairo not found]
windowing: yes [installing]
OPTIONAL LATEX DEPENDENCIES
dvipng: no
ghostscript: no
latex: no
pdftops: no
OPTIONAL PACKAGE DATA
dlls: no [skipping due to configuration]
============================================================================
* The following required packages can not be built:
* freetype, png
* Please check http://gnuwin32.sourceforge.net/packa
* ges/freetype.htm for instructions to install
* freetype
* Please check http://gnuwin32.sourceforge.net/packa
* ges/libpng.htm for instructions to install png
----------------------------------------
ERROR: Command errored out with exit status 1: python setup.py egg_info Check the logs for full command output.
和这里的问题一样Matplotlib安装问题. Pip Centos - 安装时Freetype "缺失"
不过我是在Windows系统上，所以这个解决方案不适用。
我相信这个解决方案是说这个用户需要安装freetype开发头文件，这些和 "源文件 "一样吗，即安装freetype的可选部分？如果是的话，我已经下载了它们，但不知道放在哪里。有 manifest 和 src 目录。
由 FlyingTeller 在评论中回答。解决方法是用Python 3.7 64位的venv就可以了。