Alpine Linux fatal error: ncurses.h: No such file or directory fix

When I try to compile a program on Alpine Linux, it fails with the following error:
app.c:1:10: fatal error: ncurses.h: No such file or directory
1 | #include <ncurses.h>
| ^~~~~~~~~~~
compilation terminated.

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How to add days to date and get new date on Linux

I brought eggs from the market, and it says best before 20 days from the date of packing. Say my egg box was packed on 29/July/2020. How do I add days to date using Linux CLI? I want to find out date 29/July/2020 + 20days using the CLI, and how do I do it?

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FreeBSD wget cannot verify certificate, issued by Let’s Encrypt

I installed GNU wget utility on FreeBSD as explained here. However, whenever I use the wget command to download stuff from the Internet, it says:
   ERROR: cannot verify download.freebsd.org's certificate, issued by 'CN=Let\'s Encrypt Authority X3,O=Let\'s Encrypt,C=US':
    Unable to locally verify the issuer's authority.
How do I fix this problem on FreeBSD 12?

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