注意：macOS从 10.12.6 升级到 10.15.5后 svn --version 提示：

svn: error: Failed to locate ‘svn’.

svn: error: The subversion command line tools are no longer provided by Xcode.

安装了Xcode_12.4.xip

安装了
Command_Line_Tools_for_Xcode_12.4.dmg

没有效果

终极解决方案：

1.brew install svn 遇到错误看情况；

2.下载错误，就再执行一次brew install svn;

3.解压错误，就单独安装报错的那个组件；

4.最后再执行一次brew install svn；

下面是我的安装及报错过程：

1.svn -version

svn: error: Failed to locate ‘svn’.

svn: error: The subversion command line tools are no longer provided by Xcode.

2.按网上方法安装：brew install svn

Error: The following directories are not writable by your user:

/usr/local/share/man/man5

/usr/local/share/man/man7

You should change the ownership of these directories to your user.

sudo chown -R $(whoami) /usr/local/share/man/man5 /usr/local/share/man/man7

And make sure that your user has write permission.

chmod u+w /usr/local/share/man/man5 /usr/local/share/man/man7

3.按提示执行：

sudo chown -R $(whoami) /usr/local/share/man/man5 /usr/local/share/man/man7

4.又报错了 brew install svn （由于网络原因，下载报错，需要再试一次）

Error: subversion: Failed to download resource “[email protected]”

Download failed: https://ghcr.io/v2/homebrew/core/openssl/1.1/blobs/sha256:eb4e1d96f1a9eac8d096220550e3ca97a46d59747ec2324e2ff74351f8319c2b

5.再执行一次 brew install svn

Error: subversion: Failed to download resource “subversion”

Download failed: https://ghcr.io/v2/homebrew/core/subversion/blobs/sha256:92ef7547ff26e327ac5bd0a544d850e4ca7872493747eecf2220ecf5be0a13bd

6.又执行一次 brew install svn （注意：openssl已经下载了，但解压的包名和下载的包名不一致，不知道什么原因，后面只能单独安装）

==> Pouring [email protected]_1.catalina.bottle.tar.gz

Error: No such file or directory @ rb_sysopen - /Users/wangyao/Library/Caches/Homebrew/downloads/34c46d9268f88a5b0e7d5e5437664512d4968c7d6a3466ccc12f8fcc955d3d81–[email protected]_1.catalina.bottle.tar.gz

7.还是不行 ，只能先单独装这个：brew install [email protected]

==> Pouring [email protected]–1.1.1l_1.catalina.bottle.tar.gz

==> Caveats

A CA file has been bootstrapped using certificates from the system

keychain. To add additional certificates, place .pem files in

/usr/local/etc/[email protected]/certs

and run

/usr/local/opt/[email protected]/bin/c_rehash

[email protected] is keg-only, which means it was not symlinked into /usr/local,

because macOS provides LibreSSL.

If you need to have [email protected] first in your PATH, run:

echo ‘export PATH=“/usr/local/opt/[email protected]/bin:$PATH”’ >> ~/.zshrc

For compilers to find [email protected] you may need to set:

export LDFLAGS=“-L/usr/local/opt/[email protected]/lib”

export CPPFLAGS=“-I/usr/local/opt/[email protected]/include”

==> Summary

/usr/local/Cellar/[email protected]/1.1.1l_1: 8,073 files, 18.5MB

==> Running brew cleanup [email protected]…

Disable this behaviour by setting HOMEBREW_NO_INSTALL_CLEANUP.

Hide these hints with HOMEBREW_NO_ENV_HINTS (see man brew).

8.还是报错：brew install svn (注：又一个依赖包解压报错)

==> Pouring utf8proc-2.6.1.catalina.bottle.tar.gz

Error: No such file or directory @ rb_sysopen - /Users/wangyao/Library/Caches/Homebrew/downloads/adaa3321388ae5971a6bc625e4958cd1ed975e56a2533cfb6ed54ee42f97cbf0–utf8proc-2.6.1.catalina.bottle.tar.gz

9.单独安装 brew install utf8proc

==> Pouring utf8proc–2.6.1.catalina.bottle.tar.gz

/usr/local/Cellar/utf8proc/2.6.1: 10 files, 752.2KB

==> Running brew cleanup utf8proc…

Disable this behaviour by setting HOMEBREW_NO_INSTALL_CLEANUP.

Hide these hints with HOMEBREW_NO_ENV_HINTS (see man brew).

10.终于成功了 brew install svn

==> Pouring subversion–1.14.1_4.catalina.bottle.tar.gz

==> Caveats

svntools have been installed to:

/usr/local/opt/subversion/libexec

The perl bindings are located in various subdirectories of:

/usr/local/opt/subversion/lib/perl5

You may need to link the Java bindings into the Java Extensions folder:

sudo mkdir -p /Library/Java/Extensions

sudo ln -s /usr/local/lib/libsvnjavahl-1.dylib /Library/Java/Extensions/libsvnjavahl-1.dylib

==> Summary

/usr/local/Cellar/subversion/1.14.1_4: 241 files, 32MB

==> Running brew cleanup subversion…

Disable this behaviour by setting HOMEBREW_NO_INSTALL_CLEANUP.

Hide these hints with HOMEBREW_NO_ENV_HINTS (see man brew).

11.测试 svn --version

svn，版本 1.14.1 (r1886195)

编译于 Sep 19 2021，20:02:51 在 x86_64-apple-darwin19.6.0

Copyright © 2021 The Apache Software Foundation.

This software consists of contributions made by many people;

see the NOTICE file for more information.

Subversion is open source software, see http://subversion.apache.org/

可使用以下的版本库访问模块:

• ra_svn : 使用 svn 网络协议访问版本库的模块。 - 使用 Cyrus SASL 认证

• 处理“svn”方案

• ra_local : 访问本地磁盘的版本库模块。

• 处理“file”方案

• ra_serf : Module for accessing a repository via WebDAV protocol using serf.

• using serf 1.3.9 (compiled with 1.3.9)

• 处理“http”方案

• 处理“https”方案

The following authentication credential caches are available:

• Mac OS X Keychain