To uninstall libpixman-1-dev just follow these instructions.
sudo apt-get remove libpixman-1-dev
This will remove just the libpixman-1-dev package itself.
sudo apt-get remove --auto-remove libpixman-1-dev
This will remove the libpixman-1-dev package and any other dependant packages which are no longer needed.
If you also want to delete your local/config files for libpixman-1-dev then this will work.
sudo apt-get purge libpixman-1-dev
Or similarly, like this libpixman-1-dev
sudo apt-get purge --auto-remove libpixman-1-dev
|Maintainer||Debian X Strike Force <firstname.lastname@example.org>|
|Description||pixel-manipulation library for X and cairo (development files)|