clang -O2  -Wall -Wextra -Werror=implicit-function-declaration aio/aio_return.c -o aio/aio_return -D_GNU_SOURCE -D_BSD_SOURCE -D_ALL_SOURCE -D_DEFAULT_SOURCE  -lm  -lintl
../out/minix/basic/aio/aio_return.o: In function `main':
aio/aio_return.c:(.text+0x3a6): undefined reference to `aio_write'
aio/aio_return.c:(.text+0x3ca): undefined reference to `__aio_suspend50'
aio/aio_return.c:(.text+0x3d6): undefined reference to `aio_error'
aio/aio_return.c:(.text+0x3eb): undefined reference to `aio_return'
clang: error: linker command failed with exit code 1 (use -v to see invocation)