I have a Vagrant running Linux and I\'m trying to install Symfony.
After the command composer create-project symfony/framework-standard-edition ./ \"2.5.*\"
I had this problem when provisioning the machine, which was bootstrapped to run composer install. I simply exited the VM and ran composer install on the code on my host machine and it worked.
So, if you're facing this problem while running Composer inside the VM, just try running Composer from outside the VM.
Update: As pointed in the comments below, this can pose some problems with different versions of packages being installed owing to the difference in system configurations between the local and Vagrant environments, so exercise appropriate caution while trying this.