WIN10安装：

首先改一下下载源：

1.C:\Users\xx\pip，新建文件pip.ini
2.文件里面输入：

[global]
index-url = https://pypi.tuna.tsinghua.edu.cn/simple
[install]
trusted-host=mirrors.aliyun.com

然后安装vs2019

需要勾选c++那一项。

安装face_recognition步骤如下

命令行输入：

1.python -m pip install --upgrade pip
2.pip install cmake
3.pip install dlib
4.pip install face_recognition

报错原因及解决：

1.pip install dlib出现：

You must use Visual Studio to build a python extension on windows.  If youare getting this error it means you have not installed Visual C++.  Notethat there are many flavors of Visual Studio, like Visual Studio for C#development.  You need to install Visual Studio for C++.

说明没有安装Visual Studio

安装vs2019，勾选c++那一项进行安装即可解决。

2 . pip install dlib出现ERROR: CMake must be installed to build dlib

先进行pip install cmake再pip install dlib

Ubuntu 20.04安装

改下载源

mkdir ~/.pip            // 创建隐藏的文件夹(注意用户是root还是普通user)
vim ~/.pip/pip.conf     // 创建一个pip.conf文件// 在pip.conf中粘贴进下面内容(豆瓣源)
[global]
index-url = http://pypi.douban.com/simple
[install]
trusted-host=pypi.douban.com// wq保存一下就行了

然后终端输入：

CC=gcc
CXX=g++
pip install face_recognition

报错原因及解决：

Building wheels for collected packages: dlibBuilding wheel for dlib (setup.py) ... errorERROR: Command errored out with exit status 1:command: /usr/bin/python3 -u -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/tmp/pip-install-9n08rmx4/dlib/setup.py'"'"'; __file__='"'"'/tmp/pip-install-9n08rmx4/dlib/setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' bdist_wheel -d /tmp/pip-wheel-ajvzzs1bcwd: /tmp/pip-install-9n08rmx4/dlib/Complete output (50 lines):running bdist_wheelrunning buildrunning build_pypackage init file 'tools/python/dlib/__init__.py' not found (or not a regular file)running build_extBuilding extension for Python 3.8.10 (default, Sep 28 2021, 16:10:42)Invoking CMake setup: 'cmake /tmp/pip-install-9n08rmx4/dlib/tools/python -DCMAKE_LIBRARY_OUTPUT_DIRECTORY=/tmp/pip-install-9n08rmx4/dlib/build/lib.linux-x86_64-3.8 -DPYTHON_EXECUTABLE=/usr/bin/python3 -DCMAKE_BUILD_TYPE=Release'CMake Error at /usr/share/cmake-3.16/Modules/CMakeDetermineCCompiler.cmake:49 (message):Could not find compiler set in environment variable CC:/usr/local/bin/gcc.Call Stack (most recent call first):CMakeLists.txt:14 (project)CMake Error: CMAKE_C_COMPILER not set, after EnableLanguageCMake Error: CMAKE_CXX_COMPILER not set, after EnableLanguage-- Configuring incomplete, errors occurred!See also "/tmp/pip-install-9n08rmx4/dlib/build/temp.linux-x86_64-3.8/CMakeFiles/CMakeOutput.log".Traceback (most recent call last):File "<string>", line 1, in <module>File "/tmp/pip-install-9n08rmx4/dlib/setup.py", line 222, in <module>setup(File "/usr/lib/python3/dist-packages/setuptools/__init__.py", line 144, in setupreturn distutils.core.setup(**attrs)File "/usr/lib/python3.8/distutils/core.py", line 148, in setupdist.run_commands()File "/usr/lib/python3.8/distutils/dist.py", line 966, in run_commandsself.run_command(cmd)File "/usr/lib/python3.8/distutils/dist.py", line 985, in run_commandcmd_obj.run()File "/usr/lib/python3/dist-packages/wheel/bdist_wheel.py", line 223, in runself.run_command('build')File "/usr/lib/python3.8/distutils/cmd.py", line 313, in run_commandself.distribution.run_command(command)File "/usr/lib/python3.8/distutils/dist.py", line 985, in run_commandcmd_obj.run()File "/usr/lib/python3.8/distutils/command/build.py", line 135, in runself.run_command(cmd_name)File "/usr/lib/python3.8/distutils/cmd.py", line 313, in run_commandself.distribution.run_command(command)File "/usr/lib/python3.8/distutils/dist.py", line 985, in run_commandcmd_obj.run()File "/tmp/pip-install-9n08rmx4/dlib/setup.py", line 134, in runself.build_extension(ext)File "/tmp/pip-install-9n08rmx4/dlib/setup.py", line 171, in build_extensionsubprocess.check_call(cmake_setup, cwd=build_folder)File "/usr/lib/python3.8/subprocess.py", line 364, in check_callraise CalledProcessError(retcode, cmd)subprocess.CalledProcessError: Command '['cmake', '/tmp/pip-install-9n08rmx4/dlib/tools/python', '-DCMAKE_LIBRARY_OUTPUT_DIRECTORY=/tmp/pip-install-9n08rmx4/dlib/build/lib.linux-x86_64-3.8', '-DPYTHON_EXECUTABLE=/usr/bin/python3', '-DCMAKE_BUILD_TYPE=Release']' returned non-zero exit status 1.----------------------------------------ERROR: Failed building wheel for dlibRunning setup.py clean for dlib
Failed to build dlib
Installing collected packages: face-recognition-models, dlib, face-recognitionRunning setup.py install for dlib ... errorERROR: Command errored out with exit status 1:command: /usr/bin/python3 -u -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/tmp/pip-install-9n08rmx4/dlib/setup.py'"'"'; __file__='"'"'/tmp/pip-install-9n08rmx4/dlib/setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' install --record /tmp/pip-record-476x_oyc/install-record.txt --single-version-externally-managed --user --prefix= --compile --install-headers /home/jym/.local/include/python3.8/dlibcwd: /tmp/pip-install-9n08rmx4/dlib/Complete output (52 lines):running installrunning buildrunning build_pypackage init file 'tools/python/dlib/__init__.py' not found (or not a regular file)running build_extBuilding extension for Python 3.8.10 (default, Sep 28 2021, 16:10:42)Invoking CMake setup: 'cmake /tmp/pip-install-9n08rmx4/dlib/tools/python -DCMAKE_LIBRARY_OUTPUT_DIRECTORY=/tmp/pip-install-9n08rmx4/dlib/build/lib.linux-x86_64-3.8 -DPYTHON_EXECUTABLE=/usr/bin/python3 -DCMAKE_BUILD_TYPE=Release'CMake Error at /usr/share/cmake-3.16/Modules/CMakeDetermineCCompiler.cmake:49 (message):Could not find compiler set in environment variable CC:/usr/local/bin/gcc.Call Stack (most recent call first):CMakeLists.txt:14 (project)CMake Error: CMAKE_C_COMPILER not set, after EnableLanguageCMake Error: CMAKE_CXX_COMPILER not set, after EnableLanguage-- Configuring incomplete, errors occurred!See also "/tmp/pip-install-9n08rmx4/dlib/build/temp.linux-x86_64-3.8/CMakeFiles/CMakeOutput.log".Traceback (most recent call last):File "<string>", line 1, in <module>File "/tmp/pip-install-9n08rmx4/dlib/setup.py", line 222, in <module>setup(File "/usr/lib/python3/dist-packages/setuptools/__init__.py", line 144, in setupreturn distutils.core.setup(**attrs)File "/usr/lib/python3.8/distutils/core.py", line 148, in setupdist.run_commands()File "/usr/lib/python3.8/distutils/dist.py", line 966, in run_commandsself.run_command(cmd)File "/usr/lib/python3.8/distutils/dist.py", line 985, in run_commandcmd_obj.run()File "/usr/lib/python3/dist-packages/setuptools/command/install.py", line 61, in runreturn orig.install.run(self)File "/usr/lib/python3.8/distutils/command/install.py", line 589, in runself.run_command('build')File "/usr/lib/python3.8/distutils/cmd.py", line 313, in run_commandself.distribution.run_command(command)File "/usr/lib/python3.8/distutils/dist.py", line 985, in run_commandcmd_obj.run()File "/usr/lib/python3.8/distutils/command/build.py", line 135, in runself.run_command(cmd_name)File "/usr/lib/python3.8/distutils/cmd.py", line 313, in run_commandself.distribution.run_command(command)File "/usr/lib/python3.8/distutils/dist.py", line 985, in run_commandcmd_obj.run()File "/tmp/pip-install-9n08rmx4/dlib/setup.py", line 134, in runself.build_extension(ext)File "/tmp/pip-install-9n08rmx4/dlib/setup.py", line 171, in build_extensionsubprocess.check_call(cmake_setup, cwd=build_folder)File "/usr/lib/python3.8/subprocess.py", line 364, in check_callraise CalledProcessError(retcode, cmd)subprocess.CalledProcessError: Command '['cmake', '/tmp/pip-install-9n08rmx4/dlib/tools/python', '-DCMAKE_LIBRARY_OUTPUT_DIRECTORY=/tmp/pip-install-9n08rmx4/dlib/build/lib.linux-x86_64-3.8', '-DPYTHON_EXECUTABLE=/usr/bin/python3', '-DCMAKE_BUILD_TYPE=Release']' returned non-zero exit status 1.----------------------------------------
ERROR: Command errored out with exit status 1: /usr/bin/python3 -u -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/tmp/pip-install-9n08rmx4/dlib/setup.py'"'"'; __file__='"'"'/tmp/pip-install-9n08rmx4/dlib/setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' install --record /tmp/pip-record-476x_oyc/install-record.txt --single-version-externally-managed --user --prefix= --compile --install-headers /home/jym/.local/include/python3.8/dlib Check the logs for full command output.