diff -Nur coreutils-4.5.3.orig/doc/coreutils.texi coreutils-4.5.3/doc/coreutils.texi
--- coreutils-4.5.3.orig/doc/coreutils.texi	Sun Oct 27 22:19:34 2002
+++ coreutils-4.5.3/doc/coreutils.texi	Sun Oct 27 22:48:17 2002
@@ -6188,6 +6188,11 @@
 @xref{Backup options}.
 Make a backup of each file that would otherwise be overwritten or removed.
 
+@item -C
+@opindex -C
+Install file, unless target already exists and is the same file, in which
+case the modification time is not changed.
+
 @item -c
 @opindex -c
 Ignored; for compatibility with old Unix versions of @command{install}.
--- coreutils-6.10/src/install.c.orig	2008-01-05 23:59:11.000000000 +0100
+++ coreutils-6.10/src/install.c	2008-03-02 02:21:08.251625392 +0100
@@ -20,6 +20,7 @@
 #include <stdio.h>
 #include <getopt.h>
 #include <sys/types.h>
+#include <sys/mman.h>
 #include <signal.h>
 #include <pwd.h>
 #include <grp.h>
@@ -123,6 +124,9 @@
    or S_ISGID bits.  */
 static mode_t dir_mode_bits = CHMOD_MODE_BITS;
 
+/* Compare files before installing (-C) */
+static int docompare=0;
+
 /* If true, strip executable files after copying them. */
 static bool strip_files;
 
@@ -160,6 +164,82 @@
   {NULL, 0, NULL, 0}
 };
 
+int compare (const char *file, const char *to)
+{
+  void *p, *q;
+  int ret=0;
+  size_t size;
+  int done=0;
+  struct stat file_s, to_s;
+  int file_fd, to_fd;
+  
+  stat(file, &file_s);
+  stat(to, &to_s);
+  
+  if (file_s.st_size != to_s.st_size)
+    return 1;
+
+  file_fd = open(file, O_RDONLY);
+  if (file_fd < 0)
+    return 1;
+  
+  to_fd = open(to, O_RDONLY);
+  if (to_fd < 0)
+    {
+      close(file_fd);
+      return 1;
+    }
+      
+  size = (size_t) file_s.st_size;
+  if (size <= 4194309) /* Don't try to mmap() files > 4 MB */
+    {
+      p = mmap(NULL, size, PROT_READ, MAP_SHARED, file_fd, (off_t) 0);
+      if (p != MAP_FAILED)
+	{
+          q = mmap(NULL, size, PROT_READ, MAP_SHARED, to_fd, (off_t) 0);
+          if (q == MAP_FAILED)
+            {
+              munmap(p, size);
+            }
+	  else
+            {
+              ret = (memcmp(p, q, size)==0) ? 0 : 1;
+              munmap(p, size);
+              munmap(q, size);
+              done = 1;
+            }
+       }
+    }
+  if (!done)
+    {
+      char buf1[65536], buf2[65536];
+      int n1, n2;
+
+      lseek(file_fd, 0, SEEK_SET);
+      lseek(to_fd, 0, SEEK_SET);
+      while (ret == 0)
+        {
+          n1 = read(file_fd, buf1, sizeof(buf1));
+          if (n1 == 0)
+            break;
+          else if (n1 > 0)
+            {
+              n2 = read(to_fd, buf2, n1);
+              if (n2 == n1)
+                ret = memcmp(buf1, buf2, n1);
+              else
+                ret = 1; /* ouf of sync */
+            }
+          else
+            ret = 1; /* read failure */
+        }
+    }
+
+  close(file_fd);
+  close(to_fd);
+  return ret;
+}
+
 static void
 cp_option_init (struct cp_options *x)
 {
@@ -345,7 +425,7 @@
      we'll actually use backup_suffix_string.  */
   backup_suffix_string = getenv ("SIMPLE_BACKUP_SUFFIX");
 
-  while ((optc = getopt_long (argc, argv, "bcsDdg:m:o:pt:TvS:Z:", long_options,
+  while ((optc = getopt_long (argc, argv, "bCcsDdg:m:o:pt:TvS:Z:", long_options,
 			      NULL)) != -1)
     {
       switch (optc)
@@ -357,6 +437,9 @@
 	  break;
 	case 'c':
 	  break;
+	case 'C':
+	  docompare=1;
+	  break;
 	case 's':
 	  strip_files = true;
 #ifdef SIGCHLD
@@ -627,6 +710,12 @@
      However, since !x->recursive, the call to "copy" will fail if FROM
      is a directory.  */
 
+  if (docompare)
+    {
+      if(compare(from, to) == 0) /* Files are identical */
+	return true;
+    }
+  
   return copy (from, to, false, x, &copy_into_self, NULL);
 }
 
@@ -805,6 +894,9 @@
       --backup[=CONTROL]  make a backup of each existing destination file\n\
   -b                  like --backup but does not accept an argument\n\
   -c                  (ignored)\n\
+  -C                  install file, unless the target already exists and is the\n\
+                      same, in which case mtime will remain unchanged\n\
+                      (for compatibility with *BSD)\n\
   -d, --directory     treat all arguments as directory names; create all\n\
                         components of the specified directories\n\
 "), stdout);
--- coreutils-6.4/po/pl.po.orig	2006-10-24 22:32:17.793354500 +0200
+++ coreutils-6.4/po/pl.po	2006-10-24 22:34:53.511086250 +0200
@@ -3999,12 +3999,18 @@
 "      --backup[=CONTROL]  make a backup of each existing destination file\n"
 "  -b                  like --backup but does not accept an argument\n"
 "  -c                  (ignored)\n"
+"  -C                  install file, unless the target already exists and is the\n"
+"                      same, in which case mtime will remain unchanged\n"
+"                      (for compatibility with *BSD)\n"
 "  -d, --directory     treat all arguments as directory names; create all\n"
 "                        components of the specified directories\n"
 msgstr ""
 "      --backup[=TRYB]  robienie kopii zapasowej przed zamazaniem pliku\n"
 "  -b                  jak --backup, ale bez podawania argumentu\n"
 "  -c                  (ignorowane)\n"
+"  -C                  instalowanie pliku, chyba że plik docelowy już istnieje\n"
+"                        i jest taki sam - wtedy mtime pozostanie nie zmieniony\n"
+"                        (dla kompatybilności z *BSD)\n"
 "  -d, --directory     traktowanie wszystkich argumentów jako nazw "
 "katalogów;\n"
 "                        tworzenie katalogów składowych podanych katalogów\n"