拒绝 link macOS 提供的软件：libiconv
Refusing to link macOS-provided software: libiconv
为了按照步骤 posted here 让 nokogiri 工作，我似乎无法 link iconv 正确。
当我运行命令
brew link libiconv
我收到以下错误：
Warning: Refusing to link macOS-provided software: libiconv
If you need to have libiconv first in your PATH run:
echo 'export PATH="/usr/local/opt/libiconv/bin:$PATH"' >> ~/.bash_profile
For compilers to find libiconv you may need to set:
export LDFLAGS="-L/usr/local/opt/libiconv/lib"
export CPPFLAGS="-I/usr/local/opt/libiconv/include"
我已将上述路径添加到我的 bash 配置文件中，重新加载终端，重新启动终端，甚至尝试重新启动计算机，但错误仍然存在。我也试过重新安装 libiconv 但无济于事（见下面的输出）。
$ brew reinstall libiconv
==> Reinstalling libiconv
==> Downloading https://homebrew.bintray.com/bottles/libiconv-1.16.mojave.bottle.tar.gz
Already downloaded: /Users/sam/Library/Caches/Homebrew/downloads/203933f4d9f3c2f0463012d85013a6c01bdb89fc4d435341315b4537de1dba78--libiconv-1.16.mojave.bottle.tar.gz
==> Pouring libiconv-1.16.mojave.bottle.tar.gz
==> Caveats
libiconv is keg-only, which means it was not symlinked into /usr/local,
because macOS already provides this software and installing another version in
parallel can cause all kinds of trouble.
If you need to have libiconv first in your PATH run:
echo 'export PATH="/usr/local/opt/libiconv/bin:$PATH"' >> ~/.bash_profile
For compilers to find libiconv you may need to set:
export LDFLAGS="-L/usr/local/opt/libiconv/lib"
export CPPFLAGS="-I/usr/local/opt/libiconv/include"
==> Summary
/usr/local/Cellar/libiconv/1.16: 30 files, 2.4MB
libiconv 是 keg-only.
❯ brew info libiconv
libiconv: stable 1.16 (bottled) [keg-only]
Conversion library
https://www.gnu.org/software/libiconv/
Not installed
From: https://github.com/Homebrew/homebrew-core/blob/master/Formula/libiconv.rb
==> Caveats
libiconv is keg-only, which means it was not symlinked into /usr/local,
because macOS already provides this software and installing another version in
parallel can cause all kinds of trouble.
在你给的post link中，不需要linking libiconv。因为只使用了真正的安装位置，而不是 linked 的位置。只需跳过此 link 步骤和 运行 以下命令，
# use the real installation location is not preferred, cause it will
# break you once the libiconv is upgraded to a new version
gem install nokogiri -- --with-iconv-dir=/usr/local/Cellar/libiconv/1.16
# you'd better pass the dir "/usr/local/opt/libiconv",
# which serves as a link to the real installation location.
gem install nokogiri -- --with-iconv-dir=/usr/local/opt/libiconv
为了按照步骤 posted here 让 nokogiri 工作，我似乎无法 link iconv 正确。
当我运行命令
brew link libiconv
我收到以下错误：
Warning: Refusing to link macOS-provided software: libiconv
If you need to have libiconv first in your PATH run:
echo 'export PATH="/usr/local/opt/libiconv/bin:$PATH"' >> ~/.bash_profile
For compilers to find libiconv you may need to set:
export LDFLAGS="-L/usr/local/opt/libiconv/lib"
export CPPFLAGS="-I/usr/local/opt/libiconv/include"
我已将上述路径添加到我的 bash 配置文件中，重新加载终端，重新启动终端，甚至尝试重新启动计算机，但错误仍然存在。我也试过重新安装 libiconv 但无济于事（见下面的输出）。
$ brew reinstall libiconv
==> Reinstalling libiconv
==> Downloading https://homebrew.bintray.com/bottles/libiconv-1.16.mojave.bottle.tar.gz
Already downloaded: /Users/sam/Library/Caches/Homebrew/downloads/203933f4d9f3c2f0463012d85013a6c01bdb89fc4d435341315b4537de1dba78--libiconv-1.16.mojave.bottle.tar.gz
==> Pouring libiconv-1.16.mojave.bottle.tar.gz
==> Caveats
libiconv is keg-only, which means it was not symlinked into /usr/local,
because macOS already provides this software and installing another version in
parallel can cause all kinds of trouble.
If you need to have libiconv first in your PATH run:
echo 'export PATH="/usr/local/opt/libiconv/bin:$PATH"' >> ~/.bash_profile
For compilers to find libiconv you may need to set:
export LDFLAGS="-L/usr/local/opt/libiconv/lib"
export CPPFLAGS="-I/usr/local/opt/libiconv/include"
==> Summary
/usr/local/Cellar/libiconv/1.16: 30 files, 2.4MB
libiconv 是 keg-only.
❯ brew info libiconv
libiconv: stable 1.16 (bottled) [keg-only]
Conversion library
https://www.gnu.org/software/libiconv/
Not installed
From: https://github.com/Homebrew/homebrew-core/blob/master/Formula/libiconv.rb
==> Caveats
libiconv is keg-only, which means it was not symlinked into /usr/local,
because macOS already provides this software and installing another version in
parallel can cause all kinds of trouble.
在你给的post link中，不需要linking libiconv。因为只使用了真正的安装位置，而不是 linked 的位置。只需跳过此 link 步骤和 运行 以下命令，
# use the real installation location is not preferred, cause it will
# break you once the libiconv is upgraded to a new version
gem install nokogiri -- --with-iconv-dir=/usr/local/Cellar/libiconv/1.16
# you'd better pass the dir "/usr/local/opt/libiconv",
# which serves as a link to the real installation location.
gem install nokogiri -- --with-iconv-dir=/usr/local/opt/libiconv