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-rw-r--r--Include/internal/pycore_condvar.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/Include/internal/pycore_condvar.h b/Include/internal/pycore_condvar.h
index f933089..a12b699 100644
--- a/Include/internal/pycore_condvar.h
+++ b/Include/internal/pycore_condvar.h
@@ -1,6 +1,10 @@
#ifndef Py_INTERNAL_CONDVAR_H
#define Py_INTERNAL_CONDVAR_H
+#if !defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_BUILTIN)
+# error "this header requires Py_BUILD_CORE or Py_BUILD_CORE_BUILTIN define"
+#endif
+
#ifndef _POSIX_THREADS
/* This means pthreads are not implemented in libc headers, hence the macro
not present in unistd.h. But they still can be implemented as an external