Is there any way I can download and install the CS50 library to my system and run programs importing the library instead of downloading the virtual machine ?


Here are the instructions for installing CS50 library in your OS:


  • First become root, as with:

    su -  // Fedora, RedHat, CentOS
    sudo -s  // Debian, Ubuntu, Mint //edited from sudo su -,  use sudo -s on Ubuntu.
  • Then install the CS50 Library as follows:

    yum -y install gcc  // Fedora, RedHat, CentOS
    apt-get install gcc  // Debian, Ubuntu, Mint
    wget http://mirror.cs50.net/library50/c/library50-c-5.zip
    unzip library50-c-5.zip
    rm -f library50-c-5.zip
    cd library50-c-5
    gcc -c -ggdb -std=c99 cs50.c -o cs50.o
    ar rcs libcs50.a cs50.o
    chmod 0644 cs50.h libcs50.a
    mkdir -p /usr/local/include
    chmod 0755 /usr/local/include
    mv -f cs50.h /usr/local/include
    mkdir -p /usr/local/lib
    chmod 0755 /usr/local/lib
    mv -f libcs50.a /usr/local/lib
    cd ..
    rm -rf library50-c-5

For those lucky fellows running Linux, there's this reddit explaining how to make Linux Mint "CS50 compatible" (i.e.: installing clang, check50, and cs50 libraries for Python, Ruby and PHP)

Mac OS

  • Download and install Xcode.

  • Download and unzip library50-c-5.zip.

  • Open Applications > Utilities > Terminal, and navigate your way to the CS50 Library‚Äôs directory, as with cd.

  • Execute the commands below, entering your password if prompted:

    gcc -c -ggdb -std=c99 cs50.c -o cs50.o
    ar rcs libcs50.a cs50.o
    rm -f cs50.o
    chmod 0644 cs50.h libcs50.a
    sudo mkdir -p /usr/local/include
    sudo mv -f cs50.h /usr/local/include
    sudo mkdir -p /usr/local/lib
    sudo mv -f libcs50.a /usr/local/lib
    cd ..
    rm -rf library50-c-5


It depends on your compiler, but odds are the simplest method of installation is to:

  • Download and unzip library50-c-5.zip.

  • Copy cs50.c and cs50.h into the same directory as your own code.

After installing the CS50 Library, you can include its header file atop your own code with:

#include "cs50.h"

Note the use of quotes instead of angled brackets.

  • With these Mac OS instructions I've run into problems. I'm on OSX Sierra. How do I download and install cs-50 library and x-code. Can you explain from where I download the files and how to do this without the use of Sudo or wget. My Mac terminal doesn't understand Sudo. – Android1 Mar 15 '17 at 7:48
  • I've followed these instructions and all seemed to have gone smoothly. But when I executed my test code with 'make test01.' I got this as an error message: cc test01.c -o test01 test01.c:2:10: fatal error: 'cs50.h' file not found #include "cs50.h" ^~~~~~~~ 1 error generated. make: *** [test01] Error 1 Anything else I could do to make this work? – SUPERSANE Sep 17 '19 at 2:16

An easier method is to use my CS50 tools setup if you're on Ubuntu or Fedora. Open a terminal in your download directory, and run

sudo sh cs50_setup_ubuntu.sh


sudo sh cs50_setup_fedora.sh

depending which OS you're on

Download the file here:

Ubuntu (and Ubuntu derivative, such as Linux Mint etc): https://www.dropbox.com/s/6wv06ejnw7ryqf6/cs50_setup_ubuntu.sh?dl=0

Fedora (and Fedora derivative, such as Red Hat etc): https://www.dropbox.com/s/qn3dedqznxem9vt/cs50_setup_fedora.sh?dl=0



to compile the program and


to check it.

  • Cool! I'm not versed in bash, so had to transcript the whole thing ;) BTW: why don't you start with sudo su -? does #bash do that automagically for you? is it necessary at all? (or you just forgot =P) – abelinux Jan 13 '15 at 18:49
  • 1
    No I'm not very well versed either, but I like creating files that run code for me (like batch in windows) rather than having to run each command magically. It was even more of a pain in windows, because before Win10 Tech Preview, I had to use a clunky AHK script to paste into the command prompt. .sh files just run each command in the terminal like a .bat would. And about sudo, you could do that, but I like using one line to run. Prefacing the sh with sudo runs every command in sudo. – pythonhax Jan 13 '15 at 20:28

There is also instructions in the Github repo.

But ensure to install rubygems before running gem install asciidoctor


Here's a video for adding the CS50 library for Codeblocks IDE in Windows It's similar to one @abelinux mentioned but sets it up for all projects instead of having to add it individually to each project: CS50 Library on Windows CodeBlocks IDE

There's also a small gotcha with the get_string method which it helps sidestep if you are facing issues with improper arguments or too few arguments error when trying to use it.


If using Linux and you want to install the CS50 Library from source, follow these steps: - Go to https://github.com/cs50/libcs50/releases - Download the latest release of the library (file that ends in .tar.gz) - Navigate to downloaded file - Extract the contents to a folder - Navigate to the above folder - run sudo make install

That is all. Worked well for me.

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