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-rw-r--r--rts/PosixSource.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/rts/PosixSource.h b/rts/PosixSource.h
index 6659cfef91..6246e3e35b 100644
--- a/rts/PosixSource.h
+++ b/rts/PosixSource.h
@@ -11,7 +11,7 @@
#include <ghcplatform.h>
-#if defined(freebsd_HOST_OS) || defined(dragonfly_HOST_OS)
+#if defined(freebsd_HOST_OS) || defined(dragonfly_HOST_OS) || defined(solaris2_HOST_OS)
#define _POSIX_C_SOURCE 200112L
#define _XOPEN_SOURCE 600
#else