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--- a/util-linux/mount.c
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+++ b/util-linux/mount.c
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@@ -136,6 +136,10 @@
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# include <rpc/pmap_clnt.h>
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#endif
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+#ifndef MS_UNION
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+#define MS_UNION 0x100 /* 256: Mount on top of a union */
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+#endif
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+
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#if defined(__dietlibc__)
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// 16.12.2006, Sampo Kellomaki (sampo@iki.fi)
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@@ -254,6 +258,7 @@ static const int32_t mount_options[] = {
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/* "rslave" */ MS_SLAVE|MS_RECURSIVE,
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/* "rprivate" */ MS_PRIVATE|MS_RECURSIVE,
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/* "runbindable" */ MS_UNBINDABLE|MS_RECURSIVE,
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+ /* "union" */ MS_UNION,
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)
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// Always understood.
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@@ -310,6 +315,7 @@ static const char mount_option_str[] =
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"make-rslave\0"
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"make-rprivate\0"
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"make-runbindable\0"
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+ "make-union\0"
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)
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// Always understood.
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