1diff --git a/source/common/uposixdefs.h b/source/common/uposixdefs.h 2index 826c9bb4..7c008fdd 100644 3--- a/source/common/uposixdefs.h 4+++ b/source/common/uposixdefs.h 5@@ -33,7 +33,7 @@ 6 */ 7 #ifdef _XOPEN_SOURCE 8 /* Use the predefined value. */ 9-#else 10+#elif !defined(ICU_IS_IN_FUCHSIA) || !defined(__APPLE__) 11 /* 12 * Version 6.0: 13 * The Open Group Base Specifications Issue 6 (IEEE Std 1003.1, 2004 Edition) 14