/Users/msmith/Library/Android/sdk/ndk/22.1.7171670/toolchains/llvm/prebuilt/darwin-x86_64/bin/x86_64-linux-android21-clang  -fno-strict-overflow -Wsign-compare -Wunreachable-code -DNDEBUG -g -O3 -Wall    -std=c11 -Wextra -Wno-unused-parameter -Wno-missing-field-initializers -Wstrict-prototypes -Werror=implicit-function-declaration -fvisibility=hidden  -I./Include/internal -I./Include/internal/mimalloc  -I. -I./Include     -c ./Modules/grpmodule.c -o Modules/grpmodule.o
./Modules/grpmodule.c:127:24: warning: unused variable 'buf2' [-Wunused-variable]
    char *buf = NULL, *buf2 = NULL;
                       ^
./Modules/grpmodule.c:205:24: warning: unused variable 'buf2' [-Wunused-variable]
    char *buf = NULL, *buf2 = NULL, *name_chars;
                       ^
./Modules/grpmodule.c:287:5: error: implicit declaration of function 'setgrent' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
    setgrent();
    ^
./Modules/grpmodule.c:288:17: error: implicit declaration of function 'getgrent' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
    while ((p = getgrent()) != NULL) {
                ^