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-rw-r--r--Modules/_json.c13
1 files changed, 8 insertions, 5 deletions
diff --git a/Modules/_json.c b/Modules/_json.c
index 94a7c0d..2d7c1bf 100644
--- a/Modules/_json.c
+++ b/Modules/_json.c
@@ -1,8 +1,11 @@
-
-/* Core extension modules are built-in on some platforms (e.g. Windows). */
-#ifdef Py_BUILD_CORE
-#define Py_BUILD_CORE_BUILTIN
-#undef Py_BUILD_CORE
+/* JSON accelerator C extensor: _json module.
+ *
+ * It is built as a built-in module (Py_BUILD_CORE_BUILTIN define) on Windows
+ * and as an extension module (Py_BUILD_CORE_MODULE define) on other
+ * platforms. */
+
+#if !defined(Py_BUILD_CORE_BUILTIN) && !defined(Py_BUILD_CORE_MODULE)
+# error "Py_BUILD_CORE_BUILTIN or Py_BUILD_CORE_MODULE must be defined"
#endif
#include "Python.h"