diff -urbaN YAML-LibYAML-0.35-orig//LibYAML/perl_libyaml.c YAML-LibYAML-0.35/LibYAML/perl_libyaml.c
--- YAML-LibYAML-0.35-orig//LibYAML/perl_libyaml.c	2011-04-03 18:28:08.000000000 +0200
+++ YAML-LibYAML-0.35/LibYAML/perl_libyaml.c	2011-04-08 09:25:49.633009787 +0200
@@ -188,7 +188,7 @@
     return;
 
 load_error:
-    croak(loader_error_msg(&loader, NULL));
+    croak("%s", loader_error_msg(&loader, NULL));
 }
 
 /*
@@ -271,7 +271,7 @@
     return return_sv;
 
     load_error:
-        croak(loader_error_msg(loader, NULL));
+        croak("%s", loader_error_msg(loader, NULL));
 }
 
 /*
@@ -314,7 +314,7 @@
         else if (strlen(tag) <= strlen(prefix) ||
             ! strnEQ(tag, prefix, strlen(prefix))
         ) croak(
-            loader_error_msg(loader, form("bad tag found for hash: '%s'", tag))
+            "%s", loader_error_msg(loader, form("bad tag found for hash: '%s'", tag))
         );
         class = tag + strlen(prefix);
         sv_bless(hash_ref, gv_stashpv(class, TRUE)); 
@@ -347,7 +347,7 @@
         else if (strlen(tag) <= strlen(prefix) ||
             ! strnEQ(tag, prefix, strlen(prefix))
         ) croak(
-            loader_error_msg(loader, form("bad tag found for array: '%s'", tag))
+            "%s", loader_error_msg(loader, form("bad tag found for array: '%s'", tag))
         );
         class = tag + strlen(prefix);
         sv_bless(array_ref, gv_stashpv(class, TRUE));