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-rw-r--r--llvm/lib/Support/Unix/Host.inc1
1 files changed, 1 insertions, 0 deletions
diff --git a/llvm/lib/Support/Unix/Host.inc b/llvm/lib/Support/Unix/Host.inc
index 5561906bd17..ed74b675990 100644
--- a/llvm/lib/Support/Unix/Host.inc
+++ b/llvm/lib/Support/Unix/Host.inc
@@ -20,6 +20,7 @@
#include "llvm/ADT/StringRef.h"
#include "Unix.h"
#include <sys/utsname.h>
+#include <cctype>
#include <string>
using namespace llvm;
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