Solving this problem took two steps:

Add this to your `.bashrc` / `.bash_profile` / `.zshrc`:

    # load virtualenvwrapper for python (after custom PATHs)
    venvwrap=&quot;virtualenvwrapper.sh&quot;
    /usr/bin/which -s $venvwrap
    if [ $? -eq 0 ]; then
        venvwrap=`/usr/bin/which $venvwrap`
        source $venvwrap
    fi

Then use: 

    source .bash_profile
    # or .bashrc / .zshrc

to reflect the changes.

Additionally, if the terminal still sometimes cant find `workon`, use `source .bash_profile` to reset and find it again.
 

type [`source .profile`][1] in home directory from terminal.


  [1]: https://superuser.com/questions/46139/what-does-source-do

Read the readme in the top of `which virtualenvwrapper.sh`
You need to source it inside bashrc

open ~/.profile

    cd ~
    nano .profile


add at the end

    #virtualenvwrapper setup
    export WORKON_HOME=$HOME/envs
    export PROJECT_HOME=$HOME/dev
    source /usr/local/bin/virtualenvwrapper.sh

to load your .profile file you just edited:

    $ . .profile

I ran in to this problem too and I simply needed to logout and log back in.
This read in the changes which the debian package manager made to my system at /etc/bash_completion.d/virtualenvwrapper

I have a collection like this:

    {
        &#39;datetime&#39;: some-date,
        &#39;lat&#39;: &#39;32.00&#39;,
        &#39;lon&#39;: &#39;74.00&#39;
    },
    {
        &#39;datetime&#39;: some-date,
        &#39;lat&#39;: &#39;32.00&#39;,
        &#39;lon&#39;: &#39;74.00&#39;
    }

How can I get the latest record from MongoDB, where the datetime is the latest one? I want only a single record.


Get latest MongoDB record by field of datetime

I need to do an IBAN validation check using JavaScript. The rules I need to follow are:

**Validating the IBAN**
An IBAN is validated by converting it into an integer and performing a basic mod-97 operation (as described in ISO 7064) on it. If the IBAN is valid, the remainder equals 1.

1. Check that the total IBAN length is correct as per the country. If not, the IBAN is invalid

2. Move the four initial characters to the end of the string

3. Replace each letter in the string with two digits, thereby expanding the string, where A = 10, B = 11, ..., Z = 35

4. Interpret the string as a decimal integer and compute the remainder of that number on division by 97

I am doing this for a Belarusian IBAN so it has to follow the following format

2C 31N -

RU1230000000000000000000000000000

How do I modify the following to meet the above rules;

&lt;!-- begin snippet: js hide: false console: true babel: false --&gt;

&lt;!-- language: lang-js --&gt;

    function validateIBAN(iban) {
      var newIban = iban.toUpperCase(),
        modulo = function(divident, divisor) {
          var cDivident = &#39;&#39;;
          var cRest = &#39;&#39;;

          for (var i in divident) {
            var cChar = divident[i];
            var cOperator = cRest + &#39;&#39; + cDivident + &#39;&#39; + cChar;

            if (cOperator &lt; parseInt(divisor)) {
              cDivident += &#39;&#39; + cChar;
            } else {
              cRest = cOperator % divisor;
              if (cRest == 0) {
                cRest = &#39;&#39;;
              }
              cDivident = &#39;&#39;;
            }

          }
          cRest += &#39;&#39; + cDivident;
          if (cRest == &#39;&#39;) {
            cRest = 0;
          }
          return cRest;
        };

      if (newIban.search(/^[A-Z]{2}/gi) &lt; 0) {
        return false;
      }

      newIban = newIban.substring(4) + newIban.substring(0, 4);

      newIban = newIban.replace(/[A-Z]/g, function(match) {
        return match.charCodeAt(0) - 55;
      });

      return parseInt(modulo(newIban, 97), 10) === 1;
    }


    console.log(validateIBAN(&quot;RU1230000000000000000000000000000&quot;));

&lt;!-- end snippet --&gt;



IBAN Validation check

I have installed virtualenv and the virtualwrapper via apt-get, I got to a point where I created a virtual enviroment but however later on during that same day when I used the workon command it was not found. I further on went and inspected my home directory and .virtualenvs dir and the virtualenv I created earlier were still there ...any help would be appreciated. Thanks in advance. 

Virtualenv: workon command not found

<p>I have installed virtualenv and the virtualwrapper via apt-get, I got to a point where I created a virtual enviroment but however later on during that same day when I used the workon command it was not found. I further on went and inspected my home directory and .virtualenvs dir and the virtualenv I created earlier were still there ...any help would be appreciated. Thanks in advance.</p>


I have been following a manual to install a software suite on Ubuntu. I have no knowledge of MySQL at all. I have done the following installations on my Ubuntu.

```lang-none
sudo apt-get update
sudo apt-get install mysql-server-5.5
sudo apt-get install mysql-client-5.5
sudo apt-get install mysql-common
sudo apt-get install glade
sudo apt-get install ntp
```

Then I do

```lang-none
cd ~/Desktop/iPDC-v1.3.1/DBServer-1.1
mysql -uroot -proot &lt;&quot;Db.sql&quot;
```

I ended up with the following error message.

&gt; ERROR 1045 (28000): Access denied for user &#39;root&#39;@&#39;localhost&#39; (using password: YES)

How may I fix it and continue?





ERROR 1045 (28000): Access denied for user &#39;root&#39;@&#39;localhost&#39; (using password: YES)

I have a folder in my subdomain which is created through WHM so the owner of that subdomain is not the owner of main domain. 

I want to change the owner of one of the folders of subdomain to domain owner. I tried this, but when I check with `winscp` it shows owner as 500.

  
      chown users:user /home/xyz/somnething/photo/

I&#39;ve tried to change from winscp also, but there is no option for winscp, so I&#39;ve logged in as root using putty and ran the command from above, but it doesn&#39;t help and I am unable to upload any file to subdomain from the main domain, as it returns error &quot;permission denied&quot;.


    $ ls -l /home/xyz/somnething/photo/
    total 8 
    drwxr-xr-x 2 sujit sujit 4096 Feb 21 23:39 ./ 
    drwxr-x--- 5 rohan nobody 4096 Feb 22 02:28 ../ 

I want to give the ownership of rohan to sujit to have rights to upload file from sujit domain to subdomain rohan

**Update:**

Now it is changing owner to 500 

changing the owner of folder in linux

I use the zsh and the oh-my-zsh.
When I use the github and want to use the key to upload.

I always find the 
   
    #git push
    Permission denied (publickey).
    fatal: The remote end hung up unexpectedly
Because I have not add the key
    
    #ssh-add -l
    Could not open a connection to your authentication agent.

so I have to start the ssh-agent and add the key when I want to push or pull

    #ssh-agent zsh
    #ssh-add ~/.ssh/id_rsa

How can I add these command in the script,so I don&#39;t need type the commands?


how can I run the ssh-agent auto in the zsh environment?

I want to recursively iterate through a directory and change the extension of all files of a certain extension, say `.t1` to `.t2`. What is the bash command for doing this?

Recursively change file extensions in Bash

I’m using bash shell on Linux.  I have this simple script …

	#!/bin/bash

	TEMP=`sed -n &#39;/&#39;&quot;Starting deployment of&quot;&#39;/,/&#39;&quot;Failed to start context&quot;&#39;/p&#39; &quot;/usr/java/jboss/standalone/log/server.log&quot; | tac | awk &#39;/&#39;&quot;Starting deployment of&quot;&#39;/ {print;exit} 1&#39; | tac`
	echo $TEMP

However, when I run this script

	./temp.sh

all the output is printed without the carriage returns/new lines.  Not sure if its the way I’m storing the output to $TEMP, or the echo command itself.

How do I store the output of the command to a variable and preserve the line breaks/carriage returns?

How to preserve line breaks when storing command output to a variable?

Well I am currently trying to get my django application served using nginx and uwsgi. I am currently using a virtual environment to which uwsgi is installed. However I am currently getting a 502 bad gateway error when attempting to access the page.

The Error I am experiencing.


    2014/02/27 14:20:48 [crit] 29947#0: *20 connect() to unix:///tmp/uwsgi.sock failed (13: Permission denied) while connecting to upstream, client: 144.136.65.176, server: domainname.com.au, request: &quot;GET /favicon.ico HTTP/1.1&quot;, upstream: &quot;uwsgi://unix:///tmp/uwsgi.sock:&quot;, host: &quot;www.domainname.com.au&quot;



This is my nginx.conf

        # mysite_nginx.conf
    
    # the upstream component nginx needs to connect to
    upstream django {
        server unix:///tmp/uwsgi.sock; # for a file socket
        #server 127.0.0.1:8001; # for a web port socket (we&#39;ll use this first)
    }
    
    # configuration of the server
    server {
        # the port your site will be served on
        listen      80;
        # the domain name it will serve for
        server_name .domainname.com.au; # substitute your machine&#39;s IP address or FQDN
        charset     utf-8;
    
        # max upload size
        client_max_body_size 75M;   # adjust to taste
    
        # Django media
        location /media  {
            alias /home/deepc/media;  # your Django project&#39;s media files - amend as required
        }
    
        location /static {
            alias /home/deepc/static; # your Django project&#39;s static files - amend as required
        }
    
        # Finally, send all non-media requests to the Django server.
        location / {
            uwsgi_pass  django;
            include     /home/deepc/.virtualenvs/dcwebproj/dcweb/uwsgi_params; # the uwsgi_params file you installed
        }
    }

Here is my uwsgi.ini file

    [uwsgi]
    socket=/tmp/uwsgi.sock
    chmod-socket=644
    uid = www-data
    gid = www-data
    
    chdir=/home/deepc/.virtualenvs/dcwebproj/dcweb
    module=dcweb.wsgi:application
    pidfile=/home/deepc/.virtualenvs/dcwebproj/dcweb.pid
    vacuum=true

From what i have read on google its a permissions problem with the www-data group and /tmp/ directory. However I am new to this and have tried to changer the permission level of the folder to no avail. Could someone point me in the right direction? Is this a permissions problem.

Also is it ok practice to put the sock file in tmp directory?

Thanks 






Permission denied - nginx and uwsgi socket

I am about to launch Ubuntu instance on Amazon EC2. I&#39;m choosing between PV and HVM options. I  found that PV does provide a more efficient virtualization model though I could be wrong and as Amazon offers both options I&#39;m suggesting that HVM may could have some benefits I will not get with PV. I want to use this virtual machine for GIT and maybe Team City in future. Could you help me to choose?  

Amazon EC2: Ubuntu(PV) or Ubuntu(HVM)

I&#39;m trying to compile a 32-bit C application on Ubuntu Server 12.04 LTS 64-bit using gcc 4.8. I&#39;m getting linker error messages about incompatible libraries and `skipping -lgcc`. What do I need to do to get 32 bit apps compiled and linked? 

How to Compile 32-bit Apps on 64-bit Ubuntu?

Is it possible to somehow answer the questions that are presented as dialogs when installing some packages using apt-get?

For instance I&#39;m trying to setup a container containing the `mail-stack-delivery` package with:

    FROM ubuntu

    RUN apt-get install -y mail-stack-delivery

However that dockerfile generates dozens of errors when built that are along the lines of:

    debconf: unable to initialize frontend: Dialog
    debconf: (TERM is not set, so the dialog frontend is not usable.)
    debconf: falling back to frontend: Readline
    debconf: unable to initialize frontend: Readline
    debconf: (Can&#39;t locate Term/ReadLine.pm in @INC (@INC contains: /etc/perl /usr/local/lib/perl/5.14.2 /usr/local/share/perl/5.14.2 /usr/lib/perl5 /usr/share/perl5 /usr/lib/perl/5.14 /usr/share/perl/5.14 /usr/local/lib/site_perl .) at /usr/share/perl5/Debconf/FrontEnd/Readline.pm line 7, &lt;&gt; line 11.)
    debconf: falling back to frontend: Teletype
    dpkg-preconfigure: unable to re-open stdin: 

From what I understand I just simply can&#39;t respond to the dialogs, but is there some way that I can pass a parameter to answer each question in advance? I know that it&#39;s just changing some configurations, so I could do it after the fact, but presumably it&#39;s better to let the install scripts do it so everything gets set properly.

Is it possible to answer dialog questions when installing under docker?

I am having a problem installing installing the canvas module in node..It seems to be something with cairo I am getting this error...
    
    npm http GET https://registry.npmjs.org/canvas
    npm http 304 https://registry.npmjs.org/canvas
    npm http GET https://registry.npmjs.org/nan
    npm http 304 https://registry.npmjs.org/nan
    
    &gt; canvas@1.1.3 install /Users/plimb/Desktop/motion-therapy/node_modules/canvas
    &gt; node-gyp rebuild
    
    Package cairo was not found in the pkg-config search path.
    Perhaps you should add the directory containing `cairo.pc&#39;
    to the PKG_CONFIG_PATH environment variable
    No package &#39;cairo&#39; found
    gyp: Call to &#39;./util/has_cairo_freetype.sh&#39; returned exit status 0. while trying to load binding.gyp
    gyp ERR! configure error
    gyp ERR! stack Error: `gyp` failed with exit code: 1
    gyp ERR! stack     at ChildProcess.onCpExit (/usr/local/lib/node_modules/npm/node_modules/node-gyp/lib/configure.js:424:16)
    gyp ERR! stack     at ChildProcess.EventEmitter.emit (events.js:98:17)
    gyp ERR! stack     at Process.ChildProcess._handle.onexit (child_process.js:789:12)
    gyp ERR! System Darwin 13.0.0
    gyp ERR! command &quot;node&quot; &quot;/usr/local/lib/node_modules/npm/node_modules/node-gyp/bin/node-gyp.js&quot; &quot;rebuild&quot;
    gyp ERR! cwd /Users/plimb/Desktop/motion-therapy/node_modules/canvas
    gyp ERR! node -v v0.10.21
    gyp ERR! node-gyp -v v0.10.10
    gyp ERR! not ok
    npm ERR! weird error 1 
    npm ERR! not ok code 0


I&#39;m not sure what it all means! Would appreciate any help!For example how to a mkdir cairo pc in the pkg_config_path environment variable? 



Package cairo was not found in the pkg-config search path. Node j.s install canvas issue

Few days ago I got this message in my terminal window: 
![enter image description here][1]

What does that mean? I&#39;ve never seen that before.

That was messages from xCode bots.

![bots][2] 

Thanks for the help.

  [1]: http://i.stack.imgur.com/Er6LV.png
  [2]: http://i.stack.imgur.com/sONjS.png

&quot;You have mail&quot; message in terminal, os X

When I attempt to install the latest version of compass (https://rubygems.org/gems/compass/versions/1.0.0.alpha.17), I get the following error.


    ERROR:  Error installing compass:
	ERROR: Failed to build gem native extension.

     ERROR:  Error installing compass:
      ERROR: Failed to build gem native extension.

        /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/bin/ruby extconf.rb
    checking for ffi.h... no
    checking for ffi.h in /usr/local/include,/usr/include/ffi... yes
    checking for ffi_call() in -lffi... yes
    checking for ffi_prep_closure()... yes
    checking for ffi_raw_call()... no
    checking for rb_thread_blocking_region()... yes
    checking for rb_thread_call_with_gvl()... yes
    checking for rb_thread_call_without_gvl()... yes
    checking for ffi_prep_cif_var()... no
    creating extconf.h
    creating Makefile

    make &quot;DESTDIR=&quot; clean

    make &quot;DESTDIR=&quot;
    compiling AbstractMemory.c
    compiling ArrayType.c
    compiling Buffer.c
    compiling Call.c
    Call.c:303:5: warning: implicit declaration of function &#39;rb_thread_call_without_gvl&#39; is invalid in C99 [-Wimplicit-function-declaration]
        rbffi_thread_blocking_region(call_blocking_function, data, (void *) -1, NULL);
        ^
    ./Thread.h:78:39: note: expanded from macro &#39;rbffi_thread_blocking_region&#39;
    # define rbffi_thread_blocking_region rb_thread_call_without_gvl
                                          ^
    1 warning generated.
    compiling ClosurePool.c
    compiling DataConverter.c
    DataConverter.c:43:1: warning: control may reach end of non-void function [-Wreturn-type]
    }
    ^
    1 warning generated.
    compiling DynamicLibrary.c
    compiling ffi.c
    compiling Function.c
    Function.c:479:33: warning: incompatible pointer types passing &#39;VALUE (void *)&#39; to parameter of type &#39;void *(*)(void *)&#39; [-Wincompatible-pointer-types]
            rb_thread_call_with_gvl(callback_with_gvl, &amp;cb);
                                    ^~~~~~~~~~~~~~~~~
    Function.c:102:46: note: passing argument to parameter &#39;func&#39; here
    extern void *rb_thread_call_with_gvl(void *(*func)(void *), void *data1);
                                                 ^
    Function.c:563:9: warning: implicit declaration of function &#39;rb_thread_call_without_gvl&#39; is invalid in C99 [-Wimplicit-function-declaration]
            rb_thread_call_without_gvl(async_cb_wait, &amp;w, async_cb_stop, &amp;w);
            ^
    Function.c:738:1: warning: control reaches end of non-void function [-Wreturn-type]
    }
    ^
    3 warnings generated.
    compiling FunctionInfo.c
    compiling LastError.c
    compiling LongDouble.c
    compiling MappedType.c
    compiling MemoryPointer.c
    compiling MethodHandle.c
    compiling Platform.c
    compiling Pointer.c
    compiling Struct.c
    compiling StructByReference.c
    compiling StructByValue.c
    compiling StructLayout.c
    compiling Thread.c
    compiling Type.c
    compiling Types.c
    compiling Variadic.c
    linking shared-object ffi_c.bundle
    clang: error: unknown argument: &#39;-multiply_definedsuppress&#39; [-Wunused-command-line-argument-hard-error-in-future]
    clang: note: this will be a hard error (cannot be downgraded to a warning) in the future
    make: *** [ffi_c.bundle] Error 1

    make failed, exit code 2

    Gem files will remain installed in /Library/Ruby/Gems/2.0.0/gems/ffi-1.9.3 for inspection.
    Results logged to /Library/Ruby/Gems/2.0.0/extensions/universal-darwin-13/2.0.0/ffi-1.9.3/gem_make.out


What&#39;s going on here? How do I install the latest compass without error?

Failed to build gem native extension (installing Compass)

When I try to run a script that contains the envsubst command, I get this error. Looking online, this seems to be a standard bash command, so I am not sure what to install in order to get it to work.

envsubst: command not found on Mac OS X 10.8

I read [What&#39;s new in Xcode 6][1]. The article introduces some new feature about Xcode 6, and it says:
&gt;Command Line
&gt;
&gt;Xcode’s debugger includes an interactive version of the Swift language, known as the REPL (Read-Eval-Print-Loop). Use Swift syntax to evaluate and interact with your running app or write new code in a script-like environment. The REPL is available from within LLDB in Xcode’s console, or from Terminal.

I want to know how to get the REPL?


  [1]: https://developer.apple.com/xcode/

How can I use swift in Terminal?

I&#39;m using virtualenvwrapper with a django project that has a management task that automatically writes some config files, so the user just has to

    ./manage.py generate_configuration &gt; much_nice.conf

And then move the file elsewhere. One of the generated config files is a task for supervisord that launches a celery worker. The problem I&#39;m getting is that I don&#39;t know how to **output the path of the celery executable** that is **within the bin folder** of the virtualenv. Essentially, I&#39;d like to have the output of the command

    which celery

One option is using `sys.executable`, get the folder (which seems to be the `bin` folder of the virtualenv) and that&#39;s it... but I&#39;m not sure.

Doesn&#39;t virtualenv have any kind of method to get the path itself?

Get virtualenv&#39;s bin folder path from script

I&#39;ve set up PyCharm, created my virtualenv (either through the virtual env command, or directly in PyCharm) and activated that environment as my Interpreter. Everything is working just fine.

However, if I open a terminal using &quot;Tools, Open Terminal&quot;, the shell prompt supplied is _not_ using the virtual env; I still have to use ```source ~/envs/someenv/bin/activate``` within that Terminal to activate it.

Another method is to activate the environment in a shell, and run PyCharm from that environment. This is &quot;workable&quot; but pretty ugly, and means I have major problems if I switch environments or projects from PyCharm: I&#39;m now using the totally-wrong environment.

Is there some other, much-easier way to have &quot;Tools, Open Terminal&quot; automatically activate the virtual environment?

How do I activate a virtualenv inside PyCharm&#39;s terminal?

I&#39;m trying to install numpy (and scipy and matplotlib) into a virturalenv.

I keep getting these errors though:

    RuntimeError: Broken toolchain: cannot link a simple C program
    
    ----------------------------------------
    Cleaning up...
    Command python setup.py egg_info failed with error code 1

I have the command line tools for xcode installed

    $ which gcc
    /usr/bin/gcc
    $ which cc
    /usr/bin/cc

I&#39;m on Mac OSX 10.9
Using a brew installed python


**Edit**  
Yes, trying to install with pip.  
The whole traceback is huge (&gt;400 lines)

Here is a section of it: 

    C compiler: cc -fno-strict-aliasing -fno-common -dynamic -arch x86_64 -arch i386 -g -Os -pipe -fno-common -fno-strict-aliasing -fwrapv -mno-fused-madd -DENABLE_DTRACE -DMACOSX -DNDEBUG -Wall -Wstrict-prototypes -Wshorten-64-to-32 -DNDEBUG -g -fwrapv -Os -Wall -Wstrict-prototypes -DENABLE_DTRACE -arch x86_64 -arch i386 -pipe
    
    
    
    compile options: &#39;-Inumpy/core/src/private -Inumpy/core/src -Inumpy/core -Inumpy/core/src/npymath -Inumpy/core/src/multiarray -Inumpy/core/src/umath -Inumpy/core/src/npysort -Inumpy/core/include -I/System/Library/Frameworks/Python.framework/Versions/2.7/include/python2.7 -c&#39;
    
    cc: _configtest.c
    
    clang: error: unknown argument: &#39;-mno-fused-madd&#39; [-Wunused-command-line-argument-hard-error-in-future]
    
    clang: note: this will be a hard error (cannot be downgraded to a warning) in the future
    
    clang: error: unknown argument: &#39;-mno-fused-madd&#39; [-Wunused-command-line-argument-hard-error-in-future]
    
    clang: note: this will be a hard error (cannot be downgraded to a warning) in the future
    
    failure.
    
    removing: _configtest.c _configtest.o
    
    Traceback (most recent call last):
    
      File &quot;&lt;string&gt;&quot;, line 17, in &lt;module&gt;
    
      File &quot;/Users/bdhammel/Documents/research_programming/julia_env/build/numpy/setup.py&quot;, line 192, in &lt;module&gt;
    
        setup_package()
    
      File &quot;/Users/bdhammel/Documents/research_programming/julia_env/build/numpy/setup.py&quot;, line 185, in setup_package
    
        configuration=configuration )
    
      File &quot;/Users/bdhammel/Documents/research_programming/julia_env/build/numpy/numpy/distutils/core.py&quot;, line 169, in setup
    
        return old_setup(**new_attr)
    
      File &quot;/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/distutils/core.py&quot;, line 152, in setup
    
        dist.run_commands()
    
      File &quot;/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/distutils/dist.py&quot;, line 953, in run_commands
    
        self.run_command(cmd)
    
      File &quot;/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/distutils/dist.py&quot;, line 972, in run_command
    
        cmd_obj.run()
    
      File &quot;/Users/bdhammel/Documents/research_programming/julia_env/build/numpy/numpy/distutils/command/egg_info.py&quot;, line 10, in run
    
        self.run_command(&quot;build_src&quot;)
    
      File &quot;/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/distutils/cmd.py&quot;, line 326, in run_command
    
        self.distribution.run_command(command)
    
      File &quot;/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/distutils/dist.py&quot;, line 972, in run_command
    
        cmd_obj.run()
    
      File &quot;/Users/bdhammel/Documents/research_programming/julia_env/build/numpy/numpy/distutils/command/build_src.py&quot;, line 153, in run
    
        self.build_sources()
    
      File &quot;/Users/bdhammel/Documents/research_programming/julia_env/build/numpy/numpy/distutils/command/build_src.py&quot;, line 164, in build_sources
    
        self.build_library_sources(*libname_info)
    
      File &quot;/Users/bdhammel/Documents/research_programming/julia_env/build/numpy/numpy/distutils/command/build_src.py&quot;, line 299, in build_library_sources
    
        sources = self.generate_sources(sources, (lib_name, build_info))
    
      File &quot;/Users/bdhammel/Documents/research_programming/julia_env/build/numpy/numpy/distutils/command/build_src.py&quot;, line 386, in generate_sources
    
        source = func(extension, build_dir)
    
      File &quot;numpy/core/setup.py&quot;, line 674, in get_mathlib_info
    
        raise RuntimeError(&quot;Broken toolchain: cannot link a simple C program&quot;)
    
    RuntimeError: Broken toolchain: cannot link a simple C program




Problems with pip install numpy - RuntimeError: Broken toolchain: cannot link a simple C program

I recently installed a bunch of dotfiles on my Mac along with some other applications (I changed to iTerm instead of Terminal, and Sublime as my default text editor) but ever since, all my virtual environments have stopped working, although their folders inside .virtualenvs are still there and they give the following error whenever I try to run anything in them:

    dyld: Library not loaded: @executable_path/../.Python
      Referenced from: /Users/[user]/.virtualenvs/modclass/bin/python
      Reason: image not found
    Trace/BPT trap: 5

I have removed all the files related to dotfiles and have restored my .bash_profile to what it was before, but the problem persists. Is there any way to diagnose the problem or solve it in an easy way (e.g. not requiring to create all the virtualenvs all over again)?

Broken references in Virtualenvs

Using [virtualenv][1], I run my projects with the default version of Python (2.7). On one project, I need to use Python 3.4. 

I used `brew install python3` to install it on my Mac. Now, how do I create a virtualenv that uses the new version?

e.g. sudo virtualenv envPython3

If I try:


    virtualenv -p python3 test

I get:

    Running virtualenv with interpreter /usr/local/bin/python3
    Using base prefix &#39;/usr/local/Cellar/python3/3.4.0_1/Frameworks/Python.framework/Versions/3.4&#39;
    New python executable in test/bin/python3.4
    Also creating executable in test/bin/python
    Failed to import the site module
    Traceback (most recent call last):
      File &quot;/Users/user/Documents/workspace/test/test/bin/../lib/python3.4/site.py&quot;, line 67, in &lt;module&gt;
        import os
      File &quot;/Users/user/Documents/workspace/test/test/bin/../lib/python3.4/os.py&quot;, line 634, in &lt;module&gt;
        from _collections_abc import MutableMapping
    ImportError: No module named &#39;_collections_abc&#39;
    ERROR: The executable test/bin/python3.4 is not functioning
    ERROR: It thinks sys.prefix is &#39;/Users/user/Documents/workspace/test&#39; (should be &#39;/Users/user/Documents/workspace/test/test&#39;)
    ERROR: virtualenv is not compatible with this system or executable

[1]: https://virtualenv.pypa.io/en/latest/

Content Type	Original Author	Original Content on Stackoverflow
Question	user2522955	View Question on Stackoverflow
Solution 1 - Linux	agconti	View Answer on Stackoverflow
Solution 2 - Linux	achabacha322	View Answer on Stackoverflow
Solution 3 - Linux	eran	View Answer on Stackoverflow
Solution 4 - Linux	ofir_aghai	View Answer on Stackoverflow
Solution 5 - Linux	grand central	View Answer on Stackoverflow

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