[SOLVED] Linux Mint 20.1 Cinnamon missing gcc header files

[RWMills]

Just installed Cinnamon 20.1 (upgrade from 18.3 via live cd/usb) and am unable to compile C programs.

$ gcc --version
gcc (Ubuntu 9.3.0-17ubuntu1~20.04) 9.3.0
Copyright (C) 2019 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

Compiler reports "No such file or directory" for the following header files: math.h, stdlib.h, ctype.h & sys/types.h

If I do a search for Gcc in Software Manager it shows a tick mark (installed?) for the following packages: Gcc, Gcc-10-base, Gcc-9 & Gcc-9-base

I assume that the header files are in another package that has not been installed.

[xenopeek]

To get the most common development libraries available for using with compilers, and general compiler tools, install the package build-essential. Install through Synaptic Package Manager or with command: apt install build-essential

[RWMills]

Thanks xenopeek. That solved it.

Don't remember needing to install build-essential when I upgraded from 17 to 18.