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diff --git a/clang/lib/DirectoryWatcher/linux/DirectoryWatcher-linux.cpp b/clang/lib/DirectoryWatcher/linux/DirectoryWatcher-linux.cpp
index 176d6d6abf3..a6d63bf24b8 100644
--- a/clang/lib/DirectoryWatcher/linux/DirectoryWatcher-linux.cpp
+++ b/clang/lib/DirectoryWatcher/linux/DirectoryWatcher-linux.cpp
@@ -33,6 +33,13 @@ namespace {
using namespace llvm;
using namespace clang;
+#define EPOLL_CLOEXEC -1
+#define IN_CLOEXEC -1
+#define O_CLOEXEC -1
+static int epoll_create1(int flags) { return -1; }
+static int inotify_init1(int flags) { return -1; }
+static int pipe2(int *fds, int flags) { return -1; }
+
/// Pipe for inter-thread synchronization - for epoll-ing on multiple
/// conditions. It is meant for uni-directional 1:1 signalling - specifically:
/// no multiple consumers, no data passing. Thread waiting for signal should
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