diff --git a/libguile/guile-snarf.in b/libguile/guile-snarf.in
index d1347037f..60eb14bd9 100644
--- a/libguile/guile-snarf.in
+++ b/libguile/guile-snarf.in
@@ -1,17 +1,131 @@
 #!/bin/sh
-# Extract the initialization actions for builtin things.
+# Extract the initialization actions from source files.
+#
+#  Copyright (C) 1996, 97, 98, 99, 2000, 2001, 2002 Free Software Foundation, Inc.
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2, or (at your option)
+# any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this software; see the file COPYING.  If not, write to
+# the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
+# Boston, MA 02111-1307 USA
 
+# Commentary:
+
+# Usage: guile-snarf [-d | -D] [-o OUTFILE] INFILE [CPP-OPTIONS ...]
+#
+# Process INFILE using the C pre-processor and some other programs.
+# Write output to a file named OUTFILE or to the standard output when no
+# OUTFILE has been specified or when OUTFILE is "-".
+#
+# If there are errors during processing, delete OUTFILE and exit with
+# non-zero status.
+#
+# During snarfing, the pre-processor macro SCM_MAGIC_SNARFER is
+# defined.
+#
+# Optional arg "-d" means grep INFILE for deprecated macros and
+# issue a warning if any are found.  Alternatively, "-D" means
+# do the same thing but signal error and exit w/ non-zero status.
+#
+# If env var CPP is set, use its value instead of the C pre-processor
+# determined at Guile configure-time: "@CPP@".
+
+# Code:
+
+## config
+
+deprecated_list="
+ SCM_CONST_LONG
+ SCM_VCELL
+ SCM_VCELL_INIT
+ SCM_GLOBAL_VCELL
+ SCM_GLOBAL_VCELL_INIT
+"
+
+## funcs
+
+old_school_snarf ()                     # writes stdout
+{
+${cpp} -DSCM_MAGIC_SNARFER "$@" > ${temp} && cpp_ok_p=true
+grep "^ *SCM__I" ${temp} | sed -e 's/^ *SCM__I//' -e 's/SCM__D.*$//g'
+}
+
+modern_snarf ()                         # writes stdout
+{
+    ## Apparently, AIX's preprocessor is unhappy if you try to #include an
+    ## empty file.
+    echo "/* source: $infile */" ;
+    echo "/* cpp arguments: $@ */" ;
+    ${cpp} -DSCM_MAGIC_SNARF_INITS -DSCM_MAGIC_SNARFER "$@" > ${temp} && cpp_ok_p=true
+    grep "^ *\^ *\^" ${temp} | sed -e "s/^ *\^ *\^//" -e "s/\^\ *:\ *\^.*/;/"
+}
+
+grep_deprecated ()                      # $1 is the filename
+{
+regexp="(^greetings!spooks!hows!life)"
+for dep in `echo $deprecated_list` ; do
+    regexp="(^${dep}[^_A-Z])|${regexp}"
+done
+egrep -n ${regexp} $1 /dev/null > ${temp}
+if [ -s ${temp} ] ; then
+    if $grep_dep_exit_p ; then hey=ERROR ; else hey=WARNING ; fi
+    echo $0: $hey: deprecated macros found:
+    sed -e 's/.clean.c:/:/g' ${temp}
+    $grep_dep_exit_p && exit 1
+fi
+}
+
+## main
+
+# process command line
+if [ x"$1" = x--help ] ; then
+    @AWK@ '/^#.Commentary:/,/^#.Code:/' $0 | grep -v Code: \
+        | sed -e 1,2d -e 's/^. *//g'
+    exit 0
+fi
+case x"$1" in x-d) grep_dep_p=true ; grep_dep_exit_p=false ; shift ;;
+              x-D) grep_dep_p=true ; grep_dep_exit_p=true  ; shift ;;
+              *)   grep_dep_p=false                                ;;
+esac
+if [ x"$1" = x-o ]
+    then outfile=$2 ; shift ; shift ; infile=$1 ; shift
+    else outfile="-"; infile=$1 ; shift
+fi
+
+[ x"$infile" = x ] && { echo $0: No input file ; exit 1 ; }
+[ ! -f "$infile" ] && { echo $0: No such file: $infile ; exit 1 ; }
+
+# set vars and handler -- handle CPP override
+cpp_ok_p=false
 temp="/tmp/snarf.$$"
+if [ x"$CPP" = x ] ; then cpp="@CPP@" ; else cpp="$CPP" ; fi
+
 trap "rm -f $temp" 0 1 2 15
 
-## Let the user override the preprocessor autoconf found.
-test -n "${CPP+set}" || CPP="@CPP@"
+if [ ! "$outfile" = "-" ]; then
+    old_school_snarf "$@" $infile > $outfile
+else
+    old_school_snarf "$@" $infile
+fi
 
-## We must use a temporary file here, instead of a pipe, because we
-## need to know if CPP exits with a non-zero status.
-${CPP} -DSCM_MAGIC_SNARFER "$@" > ${temp} || exit $?
-< ${temp} grep "^ *SCM__I" | sed -e "s/^ *SCM__I//" -e 's/SCM__D.*$//g'
+# grep deprecated
+$grep_dep_p && grep_deprecated $infile
 
-## Apparently, AIX's preprocessor is unhappy if you try to #include an
-## empty file.
-echo
+# zonk outfile if errors occurred
+if $cpp_ok_p ; then
+    exit 0
+else
+    [ ! "$outfile" = "-" ] && rm -f $outfile
+    exit 1
+fi
+
+# guile-snarf ends here