diff -urN rpkg-util-preproc-orig/preproc rpkg-util-preproc/preproc
--- rpkg-util-preproc-orig/preproc	2022-08-06 08:08:56.990976147 +0200
+++ rpkg-util-preproc/preproc	2022-08-06 08:09:12.022647218 +0200
@@ -5,7 +5,7 @@
 import subprocess
 import tempfile
 import argparse
-import pipes
+import shlex
 import re
 
 
@@ -16,7 +16,7 @@
     quoted_items = []
 
     for i in range(len(cmd)):
-        quoted_items.append(pipes.quote(cmd[i]))
+        quoted_items.append(shlex.quote(cmd[i]))
 
     return ' '.join(quoted_items)
 
diff -urN rpkg-util-preproc-orig/preproc-pyparsing rpkg-util-preproc/preproc-pyparsing
--- rpkg-util-preproc-orig/preproc-pyparsing	2022-08-06 08:08:56.991976126 +0200
+++ rpkg-util-preproc/preproc-pyparsing	2022-08-06 08:09:18.289510084 +0200
@@ -5,7 +5,7 @@
 import subprocess
 import tempfile
 import argparse
-import pipes
+import shlex
 
 from pyparsing import Combine, CharsNotIn, Regex, ZeroOrMore, Suppress, Literal
 
@@ -17,7 +17,7 @@
     quoted_items = []
 
     for i in range(len(cmd)):
-        quoted_items.append(pipes.quote(cmd[i]))
+        quoted_items.append(shlex.quote(cmd[i]))
 
     return ' '.join(quoted_items)