Install xotcl-dev by entering the following commands in the terminal:
sudo apt update sudo apt install xotcl-dev
Description:
Extended Object Tcl (XOTcl): Object orientation for Tcl - development files
Header files and static libraries for libxotcl. You will need this package in place if you plan to develop using the XOTcl C interface and/or if you want to create custom builts of XOTcl C extensions.
Homepage: http://www.xotcl.org/
Version: 1.6.8-3
Section: universe/libdevel