``` 226:configure:4185:16: error: call to undeclared function 'arc4random_push'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration] 229:configure:4185:46: error: call to undeclared function 'arc4random'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration] 253:configure:4185:37: error: call to undeclared function 'arc4random'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration] 277:configure:4185:16: error: call to undeclared function 'srandom'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration] 280:configure:4185:38: error: call to undeclared function 'random'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration] 304:configure:4185:16: error: call to undeclared function 'srand48'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration] 307:configure:4185:38: error: call to undeclared function 'lrand48'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration] 331:configure:4185:16: error: call to undeclared function 'srand'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration] 334:configure:4185:36: error: call to undeclared function 'rand'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration] ``` This leads to e.g.: ``` checking if you want to use mawk's own srand/rand functions... no checking for random-integer functions... unknown checking if you want mawk to initialize random numbers at startup... yes ``` instead of: ``` checking if you want to use mawk's own srand/rand functions... no checking for random-integer functions... arc4random_stir/arc4random checking for range of random-integers... 0xFFFFFFFFUL checking if <bsd/stdlib.h> should be included... yes checking if you want mawk to initialize random numbers at startup... yes ``` I've reported this upstream via email.