Index: lib/Fuzzer/test/afl-driver-extra-stats.test
===================================================================
--- lib/Fuzzer/test/afl-driver-extra-stats.test
+++ lib/Fuzzer/test/afl-driver-extra-stats.test
@@ -26,3 +26,5 @@
 RUN: printf "peak_rss_mb : 9999\nslowest_unit_time_sec: 9999\n" > %t
 RUN: AFL_DRIVER_EXTRA_STATS_FILENAME=%t AFLDriverTest
 RUN: [[ $(grep "9999" %t | wc -l) -eq 2 ]]
+
+REQUIRES: posix
Index: lib/Fuzzer/test/afl-driver-stderr.test
===================================================================
--- lib/Fuzzer/test/afl-driver-stderr.test
+++ lib/Fuzzer/test/afl-driver-stderr.test
@@ -8,3 +8,5 @@
 ; Test that a file is created when specified as the duplicate stderr.
 RUN: AFL_DRIVER_STDERR_DUPLICATE_FILENAME=%t AFLDriverTest
 RUN: stat %t
+
+REQUIRES: posix