#8 implicit declaration of function ‘putenv’; did you mean ‘getenv’?

[Jeronimo Pellegrini]

Hello!
It seems tat putenv is used to just check for an env variable. But putenv actually changes the environment...

bwb_fnc.c:966:13: warning: implicit declaration of function ‘putenv’; did you mean ‘getenv’? [-Wimplicit-function-declaration]
  966 |         if (putenv (A) == -1)
      |             ^~~~~~
      |             getenv

I'n not sure if that should have been getenv instead -- but either way, that file should include stdlib.h.

[Daniel D. Rodrigues]

I got the same error.

[AF5NE]

My apologies for the late response -- I am not often online.
If you would be so kind, please try this:

gcc -D_SVID_SOURCE -o bwbasic -lm bw*.c