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-rw-r--r--Modules/_ctypes/libffi/src/dlmalloc.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/Modules/_ctypes/libffi/src/dlmalloc.c b/Modules/_ctypes/libffi/src/dlmalloc.c
index 5c9f9c2..2773953 100644
--- a/Modules/_ctypes/libffi/src/dlmalloc.c
+++ b/Modules/_ctypes/libffi/src/dlmalloc.c
@@ -457,6 +457,11 @@ DEFAULT_MMAP_THRESHOLD default: 256K
#define LACKS_ERRNO_H
#define MALLOC_FAILURE_ACTION
#define MMAP_CLEARS 0 /* WINCE and some others apparently don't clear */
+#elif !defined _GNU_SOURCE
+/* mremap() on Linux requires this via sys/mman.h
+ * See roundup issue 10309
+ */
+#define _GNU_SOURCE 1
#endif /* WIN32 */
#ifdef __OS2__