diff -ru cdecl-13.0.orig/configure cdecl-13.0/configure

--- cdecl-13.0.orig/configure	2022-10-31 01:22:38.000000000 +0100

+++ cdecl-13.0/configure	2022-11-04 20:36:34.626729430 +0100

@@ -6143,7 +6143,7 @@

   printf %s "(cached) " >&6

 else $as_nop

       # Double quotes because $CC needs to be expanded

-    for CPP in "$CC -E" "$CC -E -traditional-cpp" cpp /lib/cpp

+    for CPP in "$CC -E" "$CC -E -traditional-cpp"

     do

       ac_preproc_ok=false

 for ac_c_preproc_warn_flag in '' yes