Gem::Ext::BuildError: ERROR: Failed to build gem native extension.

Ruby Error while installing charlock_holmes 

Error :
Fetching charlock_holmes 0.7.5
Installing charlock_holmes 0.7.5 with native extensions
Gem::Ext::BuildError: ERROR: Failed to build gem native extension.


Solution : 1
If you are using debian or ubuntu

sudo apt-get install libicu-dev

If you are using Centos or fedora

sudo yum install libicu-devel

Solution : 2
Try to install other version of charlock_holmes

gem pristine charlock_holmes --version 0.6.9.4

or

gem install charlock_holmes -v '0.6.9'

ssh Error : /usr/bin/ssh-copy-id: ERROR: No identities found

Error : /usr/bin/ssh-copy-id: ERROR: No identities found :

Solution :

Run following command on the client

# ssh-add

If it gives following error.

 Could not open a connection to your authentication agent

To remove this error, Run following command.

# eval `ssh-agent`

Now try to run ssh-add again.

If you are still getting this error, check if you have generated the keys using ssh-keygen.
Read here.