Hm, I wonder if there's a typo here in pythonrun.c: /* For use in Py_LIMITED_API */ #undef Py_CompileString PyObject * PyCompileString(const char *str, const char *filename, int start) { return Py_CompileStringFlags(str, filename, start, NULL); } Shouldn't that function be named Py_CompileString (i.e. Py_ instead of Py)? This seems to be old code, but there's normally a macro Py_CompileString() that translates to Py_CompileStringFlags() in pythonrun.h: #ifdef Py_LIMITED_API PyAPI_FUNC(PyObject *) Py_CompileString(const char *, const char *, int); #else #define Py_CompileString(str, p, s) Py_CompileStringExFlags(str, p, s, NULL, -1) #define Py_CompileStringFlags(str, p, s, f) Py_CompileStringExFlags(str, p, s, f, -1) . . .