I'm still using Yosemite. Probably you don't have OpenSSL headers in /usr/include.

This isn't intrinsic fix but reinstalling pyenv from latest github repo would help since it tries to use brew's openssl otherwise build it by itself.

@yyuu OpenSSL and zlib has been installed from brew.
I also try to install pyenv from latest github repo, but the same error msg ---> T_T

P.S. Did Apple's new security policy cause the problem? Would you choose to upgrade?

I just installed Python 2.7.10 on El Capitan (15A284) without any problems. This is definitely an environment problem, and not a problem with pyenv.

➜  ~  pyenv install 2.7.10
Downloading Python-2.7.10.tgz...
-> https://yyuu.github.io/pythons/eda8ce6eec03e74991abb5384170e7c65fcd7522e409b8e83d7e6372add0f12a
Installing Python-2.7.10...
patching file ./Lib/site.py
Installed Python-2.7.10 to /Users/thomasjo/.pyenv/versions/2.7.10

➜  ~  pyenv --version
pyenv 20150913-14-gd462e15
➜  ~  brew info openssl
openssl: stable 1.0.2d (bottled)
OpenSSL SSL/TLS cryptography library
https://openssl.org/

This formula is keg-only.
Apple has deprecated use of OpenSSL in favor of its own TLS and crypto libraries

/usr/local/Cellar/openssl/1.0.2d_1 (464 files, 17M)
  Poured from bottle
From: https://github.com/Homebrew/homebrew/blob/master/Library/Formula/openssl.rb
...

@thomasjo I am running a clean install of El Capitan instead of an upgrade, so do you?
I saw some people in other issues that had the same problem. It should not be a case that exist only on my mac.
I try to compile install python and python3 from homebrew and official source package, then everything is normal. T_T Where else may be wrong？

@Feiox Yep, clean install. Only thing I can think of that might affect this is that I have Anaconda installed, and set up as a system-level python (e.g. python global system anaconda3-2.3.0).

I have the same issues, and I use El Capitan too.

Even I install the zlip by brew, the problem is same.
I use

CFLAGS="-I$(brew --prefix openssl)/include" \
LDFLAGS="-L$(brew --prefix openssl)/lib" \
pyenv install -v 3.4.3

And it doesn't work either:

zipimport.ZipImportError: can't decompress data; zlib not available
make: *** [install] Error 1

BUILD FAILED (OS X 10.11 using python-build 20150818)

What can I do?

Well, I succeed install with the #448 solution:

CFLAGS="-I$(brew --prefix openssl)/include -I$(xcrun --show-sdk-path)/usr/include" \
LDFLAGS="-L$(brew --prefix openssl)/lib" \
pyenv install -v 3.5.0

@ccqpein @yyuu I tried to reinstall the system again, then #448 solution makes my mac normal.
Why do I use this solution the last time it invalid? (◜◔。◔◝)

THX ~

Okay...I browsed throughout the Internet....Finally I it's the x-code tool problem.
on your terminal,
xcode-select --install
then,
pyenv install 3.5.0

That's solved my problem.
May this can help you.

👍

El Capitan is like the "gift" that keeps on giving... @312024196 thank you, your solution worked a charm.

@arcseldon Glad to help you :>

xcode-select --install

solve my problem.

@ccqpein, ur solution solve my problem

xcode-select --install solved the problem for me but I would find it more useful if pyenv would detect this itself.

Problem is still here, xcode-select --install solved it too for me.

For zlib, i had the same problem

This worked for me after installing zlib with brew

CFLAGS="-I/usr/local/opt/zlib/include"
LDFLAGS="-L/usr/local/opt/zlib/lib"
pyenv install -v 3.4.5

I'm running OS X Sierra and the above didn't help for me. Found this solution here: https://medium.com/@pimterry/setting-up-pyenv-on-os-x-with-homebrew-56c7541fd331
and it did work.

CFLAGS="-I$(brew --prefix readline)/include -I$(brew --prefix openssl)/include -I$(xcrun --show-sdk-path)/usr/include" \
LDFLAGS="-L$(brew --prefix readline)/lib -L$(brew --prefix openssl)/lib" \
PYTHON_CONFIGURE_OPTS=--enable-unicode=ucs2 \
pyenv install -v 3.6.0

I was facing the problem with Python installation through all other mediums, but this is the only method worked for me.
xcode-select --install
then,
pyenv install 3.6.0a1

Thanks @echoyangyang

macos 10.13.2
xcode-select --install is success
thanks

I know, it a close issue but today Feb/4/18.
xcode-select --install do the trick

ditto, worked for me.
macOS 10.13.3
xcode-select --install

Besides pyenv I also could not install ruby versions via rbenv. At this point I started looking at the system. I'd recently upgraded and used the migration assistant to move to a new machine.

1. go to Applications and run Xcode. I had additional packages install
2. run brew doctor. if any files in /usr/local/include show up you have 2 options. Either rename the directory to something else like include_old or remove the offending entries. I chose the first.

sudo mv /usr/local/include /usr/local/include_old
sudo mkdir /usr/local/include
sudo chown $YOU_USERNAME:admin /usr/local/include

afterward, I was able to install ruby and python versions

xcode-select --install worked for me on High Sierra as well.

On Mojave:

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

@ccqpein

It is work!!
Thank you very much for your help

Error Msg

python-build: use openssl from homebrew
python-build: use readline from homebrew
Downloading Python-3.6.6.tar.xz...
-> https://www.python.org/ftp/python/3.6.6/Python-3.6.6.tar.xz
Installing Python-3.6.6...
python-build: use readline from homebrew

BUILD FAILED (OS X 10.14 using python-build 20180424)

Solved Command

CFLAGS="-I$(brew --prefix openssl)/include -I$(xcrun --show-sdk-path)/usr/include" \
LDFLAGS="-L$(brew --prefix openssl)/lib" \
pyenv install -v 3.6.6

Result Msg

Installed Python-3.6.6 to /Users/leejongyoung/.pyenv/versions/3.6.6

Zlib not being found on mojave is a separate issue: #1219