diff -up coreutils-6.11/lib/sha256.c.sparc coreutils-6.11/lib/sha256.c
--- coreutils-6.11/lib/sha256.c.sparc	2008-04-19 16:34:23.000000000 -0500
+++ coreutils-6.11/lib/sha256.c	2008-05-29 18:48:56.000000000 -0500
@@ -134,9 +134,13 @@ sha256_conclude_ctx (struct sha256_ctx *
   if (ctx->total[0] < bytes)
     ++ctx->total[1];
 
-  /* Put the 64-bit file length in *bits* at the end of the buffer.  */
-  ctx->buffer[size - 2] = SWAP ((ctx->total[1] << 3) | (ctx->total[0] >> 29));
-  ctx->buffer[size - 1] = SWAP (ctx->total[0] << 3);
+  /* Put the 64-bit file length in *bits* at the end of the buffer.
+     Use set_uint32 rather than a simple assignment, to avoid risk of
+     unaligned access.  */
+  set_uint32 ((char *) &ctx->buffer[size - 2],
+             SWAP ((ctx->total[1] << 3) | (ctx->total[0] >> 29)));
+  set_uint32 ((char *) &ctx->buffer[size - 1],
+             SWAP (ctx->total[0] << 3));
 
   memcpy (&((char *) ctx->buffer)[bytes], fillbuf, (size - 2) * 4 - bytes);
 
diff -up coreutils-6.11/lib/sha512.c.sparc coreutils-6.11/lib/sha512.c
--- coreutils-6.11/lib/sha512.c.sparc	2008-04-19 16:34:23.000000000 -0500
+++ coreutils-6.11/lib/sha512.c	2008-05-29 18:40:36.000000000 -0500
@@ -141,10 +141,14 @@ sha512_conclude_ctx (struct sha512_ctx *
   if (u64lt (ctx->total[0], u64lo (bytes)))
     ctx->total[1] = u64plus (ctx->total[1], u64lo (1));
 
-  /* Put the 64-bit file length in *bits* at the end of the buffer.  */
-  ctx->buffer[size - 2] = SWAP (u64or (u64shl (ctx->total[1], 3),
-				       u64shr (ctx->total[0], 61)));
-  ctx->buffer[size - 1] = SWAP (u64shl (ctx->total[0], 3));
+  /* Put the 128-bit file length in *bits* at the end of the buffer.
+     Use set_uint64 rather than a simple assignment, to avoid risk of
+     unaligned access.  */
+  set_uint64 ((char *) &ctx->buffer[size - 2],
+             SWAP (u64or (u64shl (ctx->total[1], 3),
+                          u64shr (ctx->total[0], 61))));
+  set_uint64 ((char *) &ctx->buffer[size - 1],
+             SWAP (u64shl (ctx->total[0], 3)));
 
   memcpy (&((char *) ctx->buffer)[bytes], fillbuf, (size - 2) * 8 - bytes);
 
diff -up coreutils-6.11/src/Makefile.am.sparc coreutils-6.11/src/Makefile.am
--- coreutils-6.11/src/Makefile.am.sparc	2008-04-19 16:34:23.000000000 -0500
+++ coreutils-6.11/src/Makefile.am	2008-05-29 18:40:36.000000000 -0500
@@ -101,6 +101,7 @@ shred_LDADD = $(LDADD) $(LIB_GETHRXTIME)
 shuf_LDADD = $(LDADD) $(LIB_GETHRXTIME)
 tac_LDADD = $(LDADD) $(LIB_CLOCK_GETTIME)
 vdir_LDADD = $(LDADD) $(LIB_CLOCK_GETTIME) $(LIB_SELINUX)
+tac_LDADD = $(LDADD) $(LIB_CLOCK_GETTIME)
 
 ## If necessary, add -lm to resolve use of pow in lib/strtod.c.
 sort_LDADD = $(LDADD) $(POW_LIB) $(LIB_GETHRXTIME)
diff -up coreutils-6.11/src/Makefile.in.sparc coreutils-6.11/src/Makefile.in
--- coreutils-6.11/src/Makefile.in.sparc	2008-04-19 16:50:10.000000000 -0500
+++ coreutils-6.11/src/Makefile.in	2008-05-29 18:40:36.000000000 -0500
@@ -1251,6 +1251,7 @@ shuf_LDADD = $(LDADD) $(LIB_GETHRXTIME)
 tac_LDADD = $(LDADD) $(LIB_CLOCK_GETTIME)
 vdir_LDADD = $(LDADD) $(LIB_CLOCK_GETTIME) $(LIB_SELINUX) $(LIB_ACL)
 sort_LDADD = $(LDADD) $(POW_LIB) $(LIB_GETHRXTIME)
+tac_LDADD = $(LDADD) $(LIB_CLOCK_GETTIME)
 
 # for get_date and gettime
 date_LDADD = $(LDADD) $(LIB_CLOCK_GETTIME)