Here are some pointers about C programming on Plan 9.
C Programming in Plan 9
- 2c(1), 2l(1), 2a(1)
2c, 6c, 8c, etc all refer to the same compiler suite, but each compiles for a different target architecture. The compiler suite is sometimes referred to as kencc. The language itself is sometimes referred to as 9c.
If an ANSI C compiler is needed, use pcc.