xvnkb on ubun

open terminal window:
#sudo apt-get install build-essential gcc xlibs-dev libxft-dev xserver-xorg-dev
#wget http://xvnkb.sourceforge.net/xvnkb-0.2.9a.tar.gz
#tar zxvf xvnkb-0.2.9a.tar.gz
#cd xvnkb-0.2.9a
#./configure
#vim config.h
edit this file: find row "-e #ifndef __VK_CONFIG_H" và remove -e.
#make
#sudo make install

to start xvnkb using command

#xvnkb

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