Hello, I have a doubt very basic.I can not do basic includes as conacts.h or calendar.h order to use the functions of these APIs.

For example:

I create any project, however when I try to insert an include in the header of a file or .cpp .h it displays the error:

“Multiple markers at this line
– Fatal error: ‘calendar.h’ file
not found
– Unresolved inclusion:
<calendar.h> “

Note: sorry, my very basic is English.