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-rw-r--r--ext/POSIX/hints/sunos_4.pl6
1 files changed, 5 insertions, 1 deletions
diff --git a/ext/POSIX/hints/sunos_4.pl b/ext/POSIX/hints/sunos_4.pl
index 59b45bc4f2..32b3558a5e 100644
--- a/ext/POSIX/hints/sunos_4.pl
+++ b/ext/POSIX/hints/sunos_4.pl
@@ -3,4 +3,8 @@
# This state of affairs also persists in glibc2, found
# on linux systems running libc6.
# XXX A Configure test is needed.
-$self->{CCFLAGS} = $Config{ccflags} . ' -DSTRUCT_TM_HASZONE' ;
+
+# Although <unistd.h> is inappropriate in general for SunOS, we need it
+# in POSIX.xs to get the correct prototype for ttyname().
+
+$self->{CCFLAGS} = $Config{ccflags} . ' -DSTRUCT_TM_HASZONE -DI_UNISTD' ;