blacklist ppx_tools_versioned 5.2.1

opam

@@ -13,14 +13,15 @@ build: [
 install: [make "install" "INSTALL_DIR=%{prefix}%"]
 remove: [make "uninstall" "INSTALL_DIR=%{prefix}%"]
 depends: [
-  "ocamlfind"    {build}
-  "camlp4"       {build}
-  "sedlex"       {build}
-  "xml-light"    {build}
-  "extlib"       {build & >= "1.7"}
-  "rope"         {build}
-  "ptmap"        {build}
-  "sha"
+  "ocamlfind"           {build}
+  "camlp4"              {build}
+  "sedlex"              {build}
+  "ppx_tools_versioned" {build & != "5.2.1"} #https://github.com/alainfrisch/sedlex/issues/64
+  "xml-light"           {build}
+  "extlib"              {build & >= "1.7"}
+  "rope"                {build}
+  "ptmap"               {build}
+  "sha"                 {build}
   "conf-libpcre"
   "conf-zlib"
   "conf-neko"