diff -purNX .cvsignore ../mknetrel.jcn1.init/.cvsignore ./.cvsignore
--- ../mknetrel.jcn1.init/.cvsignore	Mon Jul  8 15:42:06 2002
+++ ./.cvsignore	Mon Jul  8 16:04:09 2002
@@ -2,3 +2,4 @@ CVS
 *~
 #*
 .#*
+.bash_mknetrel
diff -purNX .cvsignore ../mknetrel.jcn1.init/ChangeLog ./ChangeLog
--- ../mknetrel.jcn1.init/ChangeLog	Tue Jul  9 01:17:39 2002
+++ ./ChangeLog	Tue Jul  9 01:17:29 2002
@@ -1,5 +1,16 @@
 2002-07-08  Jan Nieuwenhuizen  <janneke@gnu.org>
 
+	* VERSION mknetrel.jcn2.debug
+
+	* .cvsignore: Add .bash_mknetrel.
+
+	* bin/mknetrel (drop): New funtion.  Add trap command, to invoke
+	drop () upon unsuccessful exit, so that user make investigate at
+	the spot what went wrong.  To test this, make a function such as
+	postconfig () or postbuild () return an error.
+	(usage): Don't drop to shell.  Use exit value 2, commonly for
+	usage errors.
+
 	* VERSION mknetrel.jcn1.init
 
 	* .cvsignore: New file.
diff -purNX .cvsignore ../mknetrel.jcn1.init/bin/mknetrel ./bin/mknetrel
--- ../mknetrel.jcn1.init/bin/mknetrel	Tue Jul  9 01:06:32 2002
+++ ./bin/mknetrel	Tue Jul  9 01:07:05 2002
@@ -14,6 +14,23 @@ read_user_config() {
     : ${build_config_opts='--build=i686-pc-linux --host=i686-pc-cygwin --target=i686-pc-cygwin'}
 }
 
+# Interactive shell with state of bash at exit upon failure
+drop ()
+{
+    [ "$?" -eq 0 ] && trap - 0 9 15 && exit 0 || true
+    echo "$0: dropping to shell..."
+    set | sed -e 's/^\(BASH_VERSINFO=\)/#\1/' \
+	-e 's/^\(EUID=\)/#\1/' \
+	-e 's/^\(PPID=\)/#\1/' \
+	-e 's/^\(SHELLOPTS=\)/#\1/' \
+	-e 's/^\(UID=\)/#\1/' > .bash_mknetrel
+    echo "PS1='mknetrel-debug \w$ '" >> .bash_mknetrel
+    exec bash --rcfile .bash_mknetrel
+}
+
+# Call drop at exit
+trap drop 0 9 15
+
 setvars() {
     mknetrel=$(cd $(dirname $0)/..; pwd)
     cd $netrel_root || exit 1
@@ -329,7 +346,7 @@ Options:
 Available packages:
   $(cd $(dirname $0)/../extra && echo *[a-z])
 " 1>&2
-    exit 1
+    trap - 0 9 15 && exit 2
 }
 
 rest() {