Clearly OP has never used PC-DOS, MS-DOS, Windows 3.1, Windows 95, Windows 98, Windows ME, Windows NT, Windows 2000, Windows XP, Windows Vista, Windows 7, Windows 8, Windows 10, Windows 11, MacOS, OSX, or AmigaOS, all of which do not come with a C compiler installed out of the box. Even Ubuntu does not have gcc or build headers installed in a default install (must install build-essentials package first).
Clearly OP has never used PC-DOS, MS-DOS, Windows 3.1, Windows 95, Windows 98, Windows ME, Windows NT, Windows 2000, Windows XP, Windows Vista, Windows 7, Windows 8, Windows 10, Windows 11, MacOS, OSX, or AmigaOS, all of which do not come with a C compiler installed out of the box. Even Ubuntu does not have gcc or build headers installed in a default install (must install build-essentials package first).