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-rw-r--r--win32/unistd.h5
1 files changed, 4 insertions, 1 deletions
diff --git a/win32/unistd.h b/win32/unistd.h
index 5604103ec9..96e0aedc13 100644
--- a/win32/unistd.h
+++ b/win32/unistd.h
@@ -1 +1,4 @@
-extern void usleep(unsigned int useconds);
+#ifndef _PHP_WIN32_UNISTD_H
+#define _PHP_WIN32_UNISTD_H
+void usleep(unsigned int useconds);
+#endif