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-rw-r--r--doc/doc-txt/ChangeLog2
1 files changed, 1 insertions, 1 deletions
diff --git a/doc/doc-txt/ChangeLog b/doc/doc-txt/ChangeLog
index ef3236a62..b7a6a00e4 100644
--- a/doc/doc-txt/ChangeLog
+++ b/doc/doc-txt/ChangeLog
@@ -149,7 +149,7 @@ PP/34 Validate tls_require_ciphers on startup, since debugging an invalid
PP/35 Pull in <features.h> on Linux, for some portability edge-cases of
64-bit ${eval} (JH/03).
-PP/36 Define _ISOC99_SOURCE in exim.h; it's needed for some releases of
+PP/36 Define _GNU_SOURCE in exim.h; it's needed for some releases of
GNU libc to support some of the 64-bit stuff, should not lead to
conflicts. Defined before os.h is pulled in, so if a given platform
needs to override this, it can.