diff --git a/src/cmd/ksh93/edit/edit.c b/src/cmd/ksh93/edit/edit.c
index db00165b5..566dc41ee 100644
--- a/src/cmd/ksh93/edit/edit.c
+++ b/src/cmd/ksh93/edit/edit.c
@@ -147,9 +147,6 @@ static char KILL_LINE[20] = { ESC, '[', 'J', 0 };
 #   define _POSIX_DISABLE	0
 #endif
 
-#ifdef future
-    static int compare(const char*, const char*, int);
-#endif  /* future */
 #define ttyparm		(ep->e_ttyparm)
 #define nttyparm	(ep->e_nttyparm)
 static const char bellchr[] = "\a";	/* bell char */
@@ -212,10 +209,6 @@ int tty_set(int fd, int action, struct termios *tty)
 	register Edit_t *ep = (Edit_t*)(shgd->ed_context);
 	if(fd >=0)
 	{
-#ifdef future
-		if(ep->e_savefd>=0 && compare(&ep->e_savetty,tty,sizeof(struct termios)))
-			return(0);
-#endif
 		while(tcsetattr(fd, action, tty) == SYSERR)
 		{
 			if(errno !=EINTR)
@@ -1522,21 +1515,6 @@ int	ed_genlen(register const genchar *str)
 }
 #endif /* (SHOPT_ESH || SHOPT_VSH) && SHOPT_MULTIBYTE */
 
-#ifdef future
-/*
- * returns 1 when <n> bytes starting at <a> and <b> are equal
- */
-static int compare(register const char *a,register const char *b,register int n)
-{
-	while(n-->0)
-	{
-		if(*a++ != *b++)
-			return(0);
-	}
-	return(1);
-}
-#endif
-
 #if SHOPT_OLDTERMIO
 
 #   include	<sys/termio.h>
diff --git a/src/cmd/ksh93/edit/history.c b/src/cmd/ksh93/edit/history.c
index 974371643..d7ae71e50 100644
--- a/src/cmd/ksh93/edit/history.c
+++ b/src/cmd/ksh93/edit/history.c
@@ -240,18 +240,6 @@ int  sh_histinit(void *sh_context)
 		stakseek(offset);
 		histname = stakptr(offset);
 	}
-#ifdef future
-	if(hp=wasopen)
-	{
-		/* reuse history file if same name */
-		wasopen = 0;
-		shgd->hist_ptr = hist_ptr = hp;
-		if(strcmp(histname,hp->histname)==0)
-			return(1);
-		else
-			hist_free();
-	}
-#endif
 retry:
 	cp = path_relative(shp,histname);
 	if(!histinit)
@@ -641,18 +629,6 @@ again:
 				{
 					count += (cp-first);
 					n = hist_ind(hp, ++hp->histind);
-#ifdef future
-					if(count==hp->histcmds[n])
-					{
-	sfprintf(sfstderr,"count match n=%d\n",n);
-						if(histinit)
-						{
-							histinit = 0;
-							return;
-						}
-					}
-					else if(n>=histinit)
-#endif
 						hp->histcmds[n] = count;
 					first = cp;
 				}
diff --git a/src/cmd/ksh93/sh/deparse.c b/src/cmd/ksh93/sh/deparse.c
index d7736a4a5..4e8f82146 100644
--- a/src/cmd/ksh93/sh/deparse.c
+++ b/src/cmd/ksh93/sh/deparse.c
@@ -476,15 +476,8 @@ static void p_redirect(register const struct ionod *iop)
 		if(iop->iodelim)
 		{
 			/* here document */
-#ifdef xxx
-			iop->iolink = (char*)here_doc;
-#endif
 			here_doc  = iop;
 			io_op[2] = '<';
-#ifdef future
-			if(iof&IOSTRIP)
-				io_op[3] = '-';
-#endif
 		}
 		sfputr(outfile,cp,' ');
 		if(iop->ionxt)
@@ -586,11 +579,6 @@ static void p_switch(register const struct regnod *reg)
 static void here_body(register const struct ionod *iop)
 {
 	Sfio_t *infile;
-#ifdef xxx
-	if(iop->iolink)
-		here_body((struct inode*)iop->iolink);
-	iop->iolink = 0;
-#endif
 	if(iop->iofile&IOSTRG)
 		infile = sfnew((Sfio_t*)0,iop->ioname,iop->iosize,-1,SF_STRING|SF_READ);
 	else
diff --git a/src/lib/libast/sfio/sfcvt.c b/src/lib/libast/sfio/sfcvt.c
index 8f765db42..a073e439d 100644
--- a/src/lib/libast/sfio/sfcvt.c
+++ b/src/lib/libast/sfio/sfcvt.c
@@ -160,7 +160,7 @@ int		format;		/* conversion format		*/
 			return SF_INF;
 		}
 #endif
-# if _c99_in_the_wild
+# if __STDC_VERSION__ >= 199901L
 #  if _lib_signbit
 		if (signbit(f))
 #  else
@@ -338,7 +338,7 @@ int		format;		/* conversion format		*/
 			return SF_INF;
 		}
 #endif
-#if _c99_in_the_wild
+#if __STDC_VERSION__ >= 199901L
 # if _lib_signbit
 		if (signbit(f))
 # else