Apache with Worker MPM giving error - your PHP Module is not compiled to be threadsafe. You need to recompile PHP

I am having Ubuntu 14.10 and Apache 2.4. Currently Apache is running default mpm_prefork and I want to change it to mpm_worker.

I followed this Apache enable worker mpm to disable mpm_prefork and enable mpm_worker but it is giving error "Apache is running a threaded MPM, but your PHP Module is not compiled to be threadsafe. You need to recompile PHP." when I am restarting apache.

Now this is because php 5 doesn't work with mpm_worker so -

I followed this How to configure Apache to run PHP as FastCGI on Ubuntu 12.04 via terminal? and now I am running fastcgi as shown in phpinfo.

Everything looks fine but again, when I am disabling mpm_prefork and enabling mpm_worker, I am getting this error

"Apache is running a threaded MPM, but your PHP Module is not compiled to be threadsafe. You need to recompile PHP."

So I have have to go to default prework module to keep the site running. I am not sure what else to be done, any help ?

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