Update comment about _XOPEN_SOURCE.

2 files changed, 4 insertions, 5 deletions

diff --git a/src/s/isc3-0.h b/src/s/isc3-0.h
index be1181ae5d1..327f605ff7e 100644
--- a/src/s/isc3-0.h
+++ b/src/s/isc3-0.h
@@ -34,8 +34,8 @@
 /* We need either _XOPEN_SOURCE or _POSIX_SOURCE to import the posix
    signal symbols; might as well use _XOPEN_SOURCE.  Defining _SYSV3
    ensures that we don't lose the traditional symbols as a side effect
-   from this or __STDC__ being defined.  Define _XOPEN_SOURCE=500 for
-   compatibility with the autoconf test.  */
+   from this or __STDC__ being defined.  It can't hurt to Define
+   _XOPEN_SOURCE=500, the latest and greatest value as of this writing.  */
 #define C_SWITCH_SYSTEM -D_XOPEN_SOURCE=500 -D_SYSV3
 
 #ifdef __GNUC__  /* Currently we use -lcposix only with gcc */
diff --git a/src/s/osf5-0.h b/src/s/osf5-0.h
index af0dd1f8a63..1e490c5a998 100644
--- a/src/s/osf5-0.h
+++ b/src/s/osf5-0.h
@@ -1,11 +1,10 @@
 #define OSF5
 #include "osf1.h"
 
-/* The -BSD loses when _XOPEN_SOURCE gets defined by configure in
-   OSF 5.  It's possible this will need to be reverted for earlier
-   versions (for which OSF5 isn't defined).  */
+/* It's enough to define _OSF_SOURCE instead of _BSD.  */
 #undef C_SWITCH_SYSTEM
 #define C_SWITCH_SYSTEM -D_OSF_SOURCE
+
 #define WAIT_USE_INT
 #define SYS_SIGLIST_DECLARED
 #define sys_siglist __sys_siglist