--- guile-snarf-docs.in.orig	2010-10-25 08:56:17.000000000 -0500
+++ guile-snarf-docs.in	2010-10-25 08:56:26.000000000 -0500
@@ -23,4 +23,4 @@
 ## Let the user override the preprocessor autoconf found.
 test -n "${CPP+set}" || CPP="@CPP@"
 
-${CPP} -DSCM_MAGIC_SNARF_DOCS "$@"
+${CPP} -P -DSCM_MAGIC_SNARF_DOCS "$@"