implicit declaration of function Error when building CPython on MacOS

Question

I'm trying to build CPython from its 3.9 branch on a MacOS machine, but I'm getting the following errors when I run make -j2 -s:

./Modules/posixmodule.c:7192:9: error: implicit declaration of function 'openpty' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
    if (openpty(&master_fd, &slave_fd, NULL, NULL, NULL) != 0)
        ^
./Modules/posixmodule.c:7192:9: note: did you mean 'openat'?
/usr/include/sys/fcntl.h:516:5: note: 'openat' declared here
int     openat(int, const char *, int, ...) __DARWIN_NOCANCEL(openat) __OSX_AVAILABLE_STARTING(__MAC_10_10, __IPHONE_8_0);
        ^
./Modules/posixmodule.c:7192:9: warning: this function declaration is not a prototype [-Wstrict-prototypes]
    if (openpty(&master_fd, &slave_fd, NULL, NULL, NULL) != 0)
        ^
./Modules/posixmodule.c:7293:11: error: implicit declaration of function 'forkpty' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
    pid = forkpty(&master_fd, NULL, NULL, NULL);
          ^
./Modules/posixmodule.c:7293:11: warning: this function declaration is not a prototype [-Wstrict-prototypes]
2 warnings and 2 errors generated.
make: *** [Modules/posixmodule.o] Error 1
make: *** Waiting for unfinished jobs....

My Makefile was generated by running the following command:

CPPFLAGS="-I$(brew --prefix zlib)/include" \
LDFLAGS="-L$(brew --prefix zlib)/lib" \
./configure --with-openssl=$(brew --prefix openssl) \
--with-pydebug

Do you have any idea of what could be wrong or missing?

Update: Apparently, this is a known and unresolved issue. https://github.com/python/cpython/issues/78208

Joe Germuska · Accepted Answer · 2021-10-26 19:56:26Z

2

I've been plagued by this problem on a few different systems. In any case, I tried again, and found this GitHub issues thread for pyenv which had a lot of suggestions. In the end, this worked for me:

SDKROOT=/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk pyenv install 3.10.0

Since this original question was not about pyenv I gave it a try separately. I was able to get through make but not make test and, unfortunately, I don't have time to sleuth it all out, but maybe this will help someone anyway.

answered Oct 26, 2021 at 19:56

Joe Germuska

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