prepare (1/3): 
finished

make (2/3): 
make: Entering directory '/out/build/driver'
clang -std=gnu11 -O2 -o driver driver.c
driver successfully constructed
make: Leaving directory '/out/build/driver'
make: Entering directory '/out/build/mumsh'
clang -std=c11 -O2 -Wall -Wextra -Werror -pedantic -Wno-unused-result -o mumsh main.c
main.c:34:5: error: implicit declaration of function 'kill' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
    kill(child_pid,SIGKILL);
    ^
1 error generated.
Makefile:14: recipe for target 'mumsh' failed
make: *** [mumsh] Error 1
make: Leaving directory '/out/build/mumsh'

build failed