diff -urpN guile-1.8.8.orig/libguile/guile-snarf.in guile-1.8.8/libguile/guile-snarf.in
--- guile-1.8.8.orig/libguile/guile-snarf.in	2010-12-13 09:24:40.000000000 -0800
+++ guile-1.8.8/libguile/guile-snarf.in	2015-09-18 13:45:52.283885634 -0700
@@ -50,7 +50,7 @@ modern_snarf ()
     ## Apparently, AIX's preprocessor is unhappy if you try to #include an
     ## empty file.
     echo "/* cpp arguments: $@ */" ;
-    ${cpp} -DSCM_MAGIC_SNARF_INITS -DSCM_MAGIC_SNARFER "$@" > ${temp} && cpp_ok_p=true
+    ${cpp} -P -DSCM_MAGIC_SNARF_INITS -DSCM_MAGIC_SNARFER "$@" > ${temp} && cpp_ok_p=true
     grep "^ *\^ *\^" ${temp} | sed -e "s/^ *\^ *\^//" -e "s/\^\ *:\ *\^.*/;/"
 }