Index: boost/predef/os/bsd/bsdi.h
===================================================================
--- boost/predef/os/bsd/bsdi.h	(revision 86709)
+++ boost/predef/os/bsd/bsdi.h	(working copy)
@@ -24,7 +24,7 @@
 
 #define BOOST_OS_BSD_BSDI BOOST_VERSION_NUMBER_NOT_AVAILABLE
 
-#if !BOOST_PREDEF_DETAIL_OS_DETECTED && ( \
+#if !defined(BOOST_PREDEF_DETAIL_OS_DETECTED) && (  \
     defined(__bsdi__) \
     )
 #   ifndef BOOST_OS_BSD_AVAILABLE
Index: boost/predef/os/bsd/dragonfly.h
===================================================================
--- boost/predef/os/bsd/dragonfly.h	(revision 86709)
+++ boost/predef/os/bsd/dragonfly.h	(working copy)
@@ -24,7 +24,7 @@
 
 #define BOOST_OS_BSD_DRAGONFLY BOOST_VERSION_NUMBER_NOT_AVAILABLE
 
-#if !BOOST_PREDEF_DETAIL_OS_DETECTED && ( \
+#if !defined(BOOST_PREDEF_DETAIL_OS_DETECTED) && (  \
     defined(__DragonFly__) \
     )
 #   ifndef BOOST_OS_BSD_AVAILABLE
Index: boost/predef/os/bsd/free.h
===================================================================
--- boost/predef/os/bsd/free.h	(revision 86709)
+++ boost/predef/os/bsd/free.h	(working copy)
@@ -26,7 +26,7 @@
 
 #define BOOST_OS_BSD_FREE BOOST_VERSION_NUMBER_NOT_AVAILABLE
 
-#if !BOOST_PREDEF_DETAIL_OS_DETECTED && ( \
+#if !defined(BOOST_PREDEF_DETAIL_OS_DETECTED) && (  \
     defined(__FreeBSD__) \
     )
 #   ifndef BOOST_OS_BSD_AVAILABLE
Index: boost/predef/os/bsd/net.h
===================================================================
--- boost/predef/os/bsd/net.h	(revision 86709)
+++ boost/predef/os/bsd/net.h	(working copy)
@@ -31,7 +31,7 @@
 
 #define BOOST_OS_BSD_NET BOOST_VERSION_NUMBER_NOT_AVAILABLE
 
-#if !BOOST_PREDEF_DETAIL_OS_DETECTED && ( \
+#if !defined(BOOST_PREDEF_DETAIL_OS_DETECTED) && (  \
     defined(__NETBSD__) || defined(__NetBSD__) \
     )
 #   ifndef BOOST_OS_BSD_AVAILABLE
Index: boost/predef/os/bsd/open.h
===================================================================
--- boost/predef/os/bsd/open.h	(revision 86709)
+++ boost/predef/os/bsd/open.h	(working copy)
@@ -55,7 +55,7 @@
 
 #define BOOST_OS_BSD_OPEN BOOST_VERSION_NUMBER_NOT_AVAILABLE
 
-#if !BOOST_PREDEF_DETAIL_OS_DETECTED && ( \
+#if !defined(BOOST_PREDEF_DETAIL_OS_DETECTED) && (  \
     defined(__OpenBSD__) \
     )
 #   ifndef BOOST_OS_BSD_AVAILABLE
Index: boost/predef/os/bsd.h
===================================================================
--- boost/predef/os/bsd.h	(revision 86709)
+++ boost/predef/os/bsd.h	(working copy)
@@ -59,7 +59,7 @@
 #define BOOST_OS_BSD BOOST_VERSION_NUMBER_NOT_AVAILABLE
 #endif
 
-#if !BOOST_PREDEF_DETAIL_OS_DETECTED && ( \
+#if !defined(BOOST_PREDEF_DETAIL_OS_DETECTED) && (  \
     defined(BSD) || \
     defined(_SYSTYPE_BSD) \
     )
Index: boost/predef/os/macos.h
===================================================================
--- boost/predef/os/macos.h	(revision 86709)
+++ boost/predef/os/macos.h	(working copy)
@@ -31,7 +31,7 @@
 
 #define BOOST_OS_MACOS BOOST_VERSION_NUMBER_NOT_AVAILABLE
 
-#if !BOOST_PREDEF_DETAIL_OS_DETECTED && ( \
+#if !defined(BOOST_PREDEF_DETAIL_OS_DETECTED) && (  \
     defined(macintosh) || defined(Macintosh) || \
     (defined(__APPLE__) && defined(__MACH__)) \
     )