无法在 MacOS 上通过 pip 安装 Psycopg2软件包

我正在为我的一个讲座做一个项目，我需要下载一个包 Psycopg2，以便使用 postgreql 数据库。不幸的是，当我尝试 pip install Psycopg2时，会弹出以下错误:

ld: library not found for -lssl
clang: error: linker command failed with exit code 1 (use -v to see invocation)
error: command '/usr/bin/clang' failed with exit status 1
ld: library not found for -lssl
clang: error: linker command failed with exit code 1 (use -v to see invocation)
error: command '/usr/bin/clang' failed with exit status 1

有人知道为什么会发生这种事吗? 提前谢谢！

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It looks like the openssl package is not installed. Try installing it and pip install again. I'm not a macos user, but I believe that brew simplifies package management on that platform.

You might also need to install the Python development and postgresql development packages.

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最佳答案

I fixed this by installing Command Line Tools

xcode-select --install

then installing openssl via Homebrew and manually linking my homebrew-installed openssl to pip:

env LDFLAGS="-I/usr/local/opt/openssl/include -L/usr/local/opt/openssl/lib" pip install psycopg2

on macOS Sierra 10.12.1

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  1. Install/update Xcode developer tools 

    xcode-select --install

  2. Query postgres path

    find / -name pg_config  2>/dev/null

  3. Install psycopg2, use the path you got in step 2. Mine was '/usr/local/Cellar/postgresql/9.5.0/bin/pg_config'

    PATH=$PATH:/usr/local/Cellar/postgresql/9.5.0/bin/ pip install psycopg2
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This works for me (on a terminal):

find / -name pg_config  2>/dev/null

then add the path:

export PATH=$PATH:/Applications/Postgres.app/Contents/Versions/9.5/bin/

os version: MacOs Sierra

I hope this helps.

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Try installing it with:

pip install psycopg2-binary
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Old, but for folks using pipenv, I resolved this issue by looking at my dependency graph pipenv graph --reverse and noticing it required psycopg2-binary==2.8.2. Running pipenv install psycopg2-binary resolved the issue.

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brew install postgresql

If postgresql exist then run:

brew upgrade postgresql
sudo pip install psycopg2

In venv:

env LDFLAGS='-L/usr/local/lib -L/usr/local/opt/openssl/lib -L/usr/local/opt/readline/lib' pip install psycopg2==2.8.4

If you need use only the command pip install psycopg2 export the path in macOSX:

export LDFLAGS="-I/usr/local/opt/openssl/include -L/usr/local/opt/openssl/lib"
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Running into a similar problem using pipenv install psycopg2:

ld: library not found for -lssl', ' clang: error: linker command failed with exit code 1 (use -v to see invocation)', " error: command 'clang' failed with exit status 1", '
----------------------------------------',

I tried all of the recommendations above and none of them worked. I'd faced this problem in another virtualenv a few months ago and remembered reading something about this being a psycopg2 version issue. So I tried installing with 2.7.1 and 2.8.3 and both still failed. Somehow version 2.7.7 worked:

pipenv install psycopg2==2.7.7

Wish I had time to look into this further to understand what's really happening. But for now I don't and this worked.

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env LDFLAGS="-I/usr/local/opt/openssl/include -L/usr/local/opt/openssl/lib" \
brew upgrade openssl

Then I could install psycopg2

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I fixed it with:

brew reinstall openssl

export LIBRARY_PATH=$LIBRARY_PATH:/usr/local/opt/openssl/lib/
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In case you don't want to faff around with brew, here's the "MacOS-only solution":

sudo installer -pkg /Library/Developer/CommandLineTools/Packages/macOS_SDK_headers_for_macOS_10.14.pkg -target /

After this, pip will gladly install psycopg2 from the source. Works with "Mojave" (macOS 10.14).

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As per current/todey condition - only solution for this is - uninstall your python 3.8 or 3.9 or so on and install ptyhon 3.7.4

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try this -->pip install psycopg2-binary

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The only thing that worked for me was:

pip install psycopg2==2.7.7
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Well, tons of different options didn't work for me, but finally!

First, try this:

brew reinstall openssl

At the end of the reinstallation process you will get basically the following lines within Caveats section, which I've put in the zshrc config file since I use macOS Big Sur (version 11.1) and zsh terminal.

Open zshrc or other config file specific to your system:

nano ~/.zshrc

Paste the following lines at the end (or change these commands accordingly to the Caveats you've got), just keep in mind that OpenSSL provided by Homebrew might conflict with the system's one (I've got a warning that macOS provides LibreSSL) but it worked well anyway:

export PATH="/opt/homebrew/opt/openssl@1.1/bin:$PATH"
export LDFLAGS="-L/opt/homebrew/opt/openssl@1.1/lib"
export CPPFLAGS="-I/opt/homebrew/opt/openssl@1.1/include"

Save the file and exit by pressing ^X and confirming with Yes.

Hopefully you can now install psycopg2:

pip3 install psycopg2-binary

I'm still not sure what was the root cause of the problem, it just appeared suddenly when I tried to reinstall pipenv for my project (maybe some recent system updates).

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Try installing: pip install psycopg2-binary it works

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I ran into the same error on macOS Big Sur (11.5.1) and Python 3.9.6.

It turned out, the psycopg2 (as well as pandas) versions I was using were too old. The error disappeared and pip install started working fine after upgrading the above packages.

Ref: https://github.com/Azure/azure-cli/issues/12854#issuecomment-619213863

In general, if the solutions suggested here by others don't help, try upgrading the troubling python package.

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For Mac OS 11.06 BigSur M1 ship, installing under a pyenv

brew reinstall libpq
brew reinstall openssl

Or install if its not already the case

brew info libpq
brew info openssl

Combine the 2 exported output logically, from

For compilers to find openssl@3 you may need to set:

export LDFLAGS="-L/opt/homebrew/opt/openssl@3/lib"

export CPPFLAGS="-I/opt/homebrew/opt/openssl@3/include"

export LDFLAGS="-L/opt/homebrew/opt/libpq/lib"

export CPPFLAGS="-I/opt/homebrew/opt/libpq/include"

into

export LDFLAGS="-L/opt/homebrew/opt/libpq/lib -L/opt/homebrew/opt/openssl@3/lib"
export CPPFLAGS="-I/opt/homebrew/opt/libpq/include -I/opt/homebrew/opt/openssl@3/include"

Then you can reinstall psycopg2, forcing the recompile, otherwise you will have this problem at runtime

pip uninstall psycopg2
pip install psycopg2 --no-cache-dir
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On my scenario, it was performed on:

ProductName:    macOS
ProductVersion: 12.1
BuildVersion:   21C52
  • I proceed to install the following libraries by brewcommand:
brew install openssl libpq
  • Set specific variables:
export LDFLAGS="-L/opt/homebrew/opt/libpq/lib -L/opt/homebrew/opt/openssl@3/lib"
export CPPFLAGS="-I/opt/homebrew/opt/libpq/include -I/opt/homebrew/opt/openssl@3/include"
  • Proceed to install the python package psycopg2-binary via pip3:
pip3 install psycopg2-binary

If you are wondering why it is necessary to set those specific variables, take a look in the docs of the package via brew info command:

brew info openssl
brew info libpq

When the outcome is displayed, look for this sentence:

...
For compilers to find libpq you may need to set:
export LDFLAGS="-L/opt/homebrew/opt/libpq/lib"
export CPPFLAGS="-I/opt/homebrew/opt/libpq/include"
...
For compilers to find openssl@3 you may need to set:
export LDFLAGS="-L/opt/homebrew/opt/openssl@3/lib"
export CPPFLAGS="-I/opt/homebrew/opt/openssl@3/include"
...

Thats why, when pip is installing a package, needs a reference where to look for the libraries/compilers.

A perfect place to set this variables would be ~/.bashrc, for future installations regarding postgres and ssl:

export LDFLAGS="-L/opt/homebrew/opt/libpq/lib -L/opt/homebrew/opt/openssl@3/lib"
export CPPFLAGS="-I/opt/homebrew/opt/libpq/include -I/opt/homebrew/opt/openssl@3/include"

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