9 files changed, 8 insertions, 44 deletions
diff --git a/doio.c b/doio.c
index 1fdedc2f07..bd4d353f00 100644
--- a/doio.c
+++ b/doio.c
@@ -51,11 +51,6 @@
 #include <signal.h>
 #endif
 
-/* XXX If this causes problems, set i_unistd=undef in the hint file.  */
-#ifdef I_UNISTD
-#  include <unistd.h>
-#endif
-
 #ifdef SOCKS_64BIT_BUG
 typedef struct __s64_iobuffer {
     struct __s64_iobuffer *next, *last;		/* Queue pointer */
diff --git a/malloc.c b/malloc.c
index 42c2d651c6..0f668cdfcb 100644
--- a/malloc.c
+++ b/malloc.c
@@ -886,18 +886,12 @@ static	union overhead *nextf[NBUCKETS];
 #endif
 
 #ifdef USE_PERL_SBRK
-#define sbrk(a) Perl_sbrk(a)
+# define sbrk(a) Perl_sbrk(a)
 Malloc_t Perl_sbrk (int size);
-#else 
-#ifdef DONT_DECLARE_STD
-#ifdef I_UNISTD
-#include <unistd.h>
-#endif
 #else
-#ifndef HAS_SBRK_PROTO
+# ifndef HAS_SBRK_PROTO /* <unistd.h> usually takes care of this */
 extern	Malloc_t sbrk(int);
-#endif
-#endif
+# endif
 #endif
 
 #ifdef DEBUGGING_MSTATS
diff --git a/mg.c b/mg.c
index 867cf38488..660fa54140 100644
--- a/mg.c
+++ b/mg.c
@@ -16,11 +16,6 @@
 #define PERL_IN_MG_C
 #include "perl.h"
 
-/* XXX If this causes problems, set i_unistd=undef in the hint file.  */
-#ifdef I_UNISTD
-# include <unistd.h>
-#endif
-
 #if defined(HAS_GETGROUPS) || defined(HAS_SETGROUPS)
 #  ifndef NGROUPS
 #    define NGROUPS 32
diff --git a/perl.h b/perl.h
index 9418b52cc0..de6185b401 100644
--- a/perl.h
+++ b/perl.h
@@ -496,12 +496,16 @@ register struct op *Perl_op asm(stringify(OP_IN_REGISTER));
 #   include <sys/param.h>
 #endif
 
-
 /* Use all the "standard" definitions? */
 #if defined(STANDARD_C) && defined(I_STDLIB)
 #   include <stdlib.h>
 #endif
 
+/* If this causes problems, set i_unistd=undef in the hint file.  */
+#ifdef I_UNISTD
+#   include <unistd.h>
+#endif
+
 #ifdef PERL_MICRO /* Last chance to export Perl_my_swap */
 #  define MYSWAP
 #endif
diff --git a/pp.c b/pp.c
index 59c67e9957..17beb6c8a1 100644
--- a/pp.c
+++ b/pp.c
@@ -82,10 +82,6 @@ static double UV_MAX_cxux = ((double)UV_MAX);
 
 /* variations on pp_null */
 
-#ifdef I_UNISTD
-#include <unistd.h>
-#endif
-
 /* XXX I can't imagine anyone who doesn't have this actually _needs_
    it, since pid_t is an integral type.
    --AD  2/20/1998
diff --git a/pp_hot.c b/pp_hot.c
index b0d53bcc20..7b5f8320e8 100644
--- a/pp_hot.c
+++ b/pp_hot.c
@@ -19,10 +19,6 @@
 #define PERL_IN_PP_HOT_C
 #include "perl.h"
 
-#ifdef I_UNISTD
-#include <unistd.h>
-#endif
-
 /* Hot code. */
 
 #ifdef USE_THREADS
diff --git a/pp_sys.c b/pp_sys.c
index 9e6d065248..12c368dea3 100644
--- a/pp_sys.c
+++ b/pp_sys.c
@@ -35,11 +35,6 @@
 #   include <shadow.h>
 #endif
 
-/* XXX If this causes problems, set i_unistd=undef in the hint file.  */
-#ifdef I_UNISTD
-# include <unistd.h>
-#endif
-
 #ifdef HAS_SYSCALL
 #ifdef __cplusplus
 extern "C" int syscall(unsigned long,...);
diff --git a/toke.c b/toke.c
index b48577e9e2..6cb8e16889 100644
--- a/toke.c
+++ b/toke.c
@@ -69,12 +69,6 @@ static I32 utf16rev_textfilter(pTHXo_ int idx, SV *sv, int maxlen);
 #define LEX_FORMLINE		 1
 #define LEX_KNOWNEXT		 0
 
-/* XXX If this causes problems, set i_unistd=undef in the hint file.  */
-#ifdef I_UNISTD
-#  include <unistd.h> /* Needed for execv() */
-#endif
-
-
 #ifdef ff_next
 #undef ff_next
 #endif
diff --git a/util.c b/util.c
index 02d0ed52f5..d9ea421afb 100644
--- a/util.c
+++ b/util.c
@@ -26,11 +26,6 @@
 #endif
 #endif
 
-/* XXX If this causes problems, set i_unistd=undef in the hint file.  */
-#ifdef I_UNISTD
-#  include <unistd.h>
-#endif
-
 #ifdef I_VFORK
 #  include <vfork.h>
 #endif