I'm trying to install the following C POSIX headers in Ubuntu 14.04 but for some reason some of them won't install.

1. sys/ioctl.h


2. unistd.h


3. locale.h


4. ncursesw/ncurses.h

Commands tried

sudo apt-get install sys/ioctl.h

sudo apt-get install unistd.h

sudo apt-get install locale.h

sudo apt-get install ncursesw/ncruses.h

I've only managed to install locale.h but for some reason the rest return a regex error stating that sys/ioctl.h wasn't found. I'm fairly new to Linux/Ubuntu and are not sure what to do at this point. Any help is appreciated