Stefan Fiedler:

package/base/mine/special-files.patch

@@ -0,0 +1,28 @@
+diff -dur mine-0.24/md5sum.c mine-0.24-p/md5sum.c
+--- mine-0.24/md5sum.c	2005-08-09 12:57:29.000000000 +0200
++++ mine-0.24-p/md5sum.c	2006-03-24 22:00:15.000000000 +0100
+@@ -20,6 +20,7 @@
+ #include <stdio.h>
+ #include <dirent.h>
+ #include <string.h>
++#include <sys/types.h>
+ #include <sys/stat.h>
+ #include <unistd.h>
+ 
+@@ -37,8 +38,14 @@
+ 	struct stat statbuf;
+ 
+ 	snprintf(realfilename, 1024, "%s/%s", root, filename);
+-	return (stat(realfilename, &statbuf) != 0 || S_ISFIFO(statbuf.st_mode))
+-		? "" : md5_file(realfilename);
++	if (stat(realfilename, &statbuf) != 0)
++		return "";
++	else if ( S_ISCHR(statbuf.st_mode) || S_ISBLK(statbuf.st_mode)
++		|| S_ISLNK(statbuf.st_mode) || S_ISSOCK(statbuf.st_mode)
++		|| S_ISFIFO(statbuf.st_mode) )
++		return "X";
++	else
++		return md5_file(realfilename);
+ }
+ 
+ /* Returns 1 if file is duplicate, 2 if file is modified. */

scripts/Build-Pkg

@@ -706,7 +706,7 @@ if [ $update = 1 ] ; then
 	echo_status "Creating backup of old package data (running in update mode)."
 	(
 		cd $xroot/
-		cat var/adm/md5sums/$xpkg var/adm/md5sums/$xpkg:* 2> /dev/null |
+		grep -v "^X" var/adm/md5sums/$xpkg var/adm/md5sums/$xpkg:* 2> /dev/null |
 			md5sum --check - 2>&1 | grep ': FAILED$' | cut -f1 -d:
 	) > $builddir/backup_files.txt
 	if [ -s $builddir/backup_files.txt ] ; then
@@ -1074,13 +1074,16 @@ abort() {
 		getfiles < var/adm/flists/$spkg > $builddir/files.lst
 		if [ -s $builddir/files.lst ] ; then
 			while read file ; do
-				[[ $file = var/adm/* ]] && continue
+				[[ "$file" = "var/adm/*" ]] && continue
 				[ -z "${file//[ 	]/}" ] && continue
-				if [ ${ROCKCFG_CREATE_CKSUM} -eq 1 ] ; then
+				if [ -b "$file" -o -c "$file" -o -p "$file" -o -L "$file" -o -S "$file" ] ; then
+					echo "X ${file}" >> var/adm/md5sums/$spkg
+					echo "X $( stat -c %s ${file} ) ${file}" >> var/adm/cksums/$spkg
+				elif [ ${ROCKCFG_CREATE_CKSUM} -eq 1 ] ; then
 					md5sum "${file}" >> var/adm/md5sums/$spkg
 					cksum "${file}"  >> var/adm/cksums/$spkg
 				else
-					echo "0  ${file}" >> var/adm/md5sums/$spkg
+					echo "0 ${file}" >> var/adm/md5sums/$spkg
 					echo "0 $( stat -c %s ${file} ) ${file}" >> var/adm/cksums/$spkg
 				fi
 			done < $builddir/files.lst