Install libecal1.2-dev by entering the following commands in the terminal:
sudo apt update sudo apt install libecal1.2-dev
Description:
Client library for evolution calendars (development files)
Evolution is the integrated mail, calendar, task and address book distributed suite from Novell, Inc. . This package contains header files and static library for libecal.
Homepage: https://wiki.gnome.org/Apps/Evolution
Version: 3.28.1-1ubuntu1
Section: libdevel