It's unlikely that future versions will require _POSIX_C_SOURCE
diff --git a/configure b/configure
index ccdf62e..8da9b5e 100755
--- a/configure
+++ b/configure
@@ -1588,7 +1588,7 @@
# disables platform specific features beyond repair.
# On Mac OS X 10.3, defining _POSIX_C_SOURCE or _XOPEN_SOURCE
# has no effect, don't bother defining them
- Darwin/[78].*)
+ Darwin/[789].*)
define_xopen_source=no
;;
diff --git a/configure.in b/configure.in
index 54cd3c1..542463e 100644
--- a/configure.in
+++ b/configure.in
@@ -236,7 +236,7 @@
# disables platform specific features beyond repair.
# On Mac OS X 10.3, defining _POSIX_C_SOURCE or _XOPEN_SOURCE
# has no effect, don't bother defining them
- Darwin/@<:@78@:>@.*)
+ Darwin/@<:@789@:>@.*)
define_xopen_source=no
;;