diff --git a/ocaml-sedlex.spec b/ocaml-sedlex.spec
index 07f25c5..feee7ec 100644
--- a/ocaml-sedlex.spec
+++ b/ocaml-sedlex.spec
@@ -1,6 +1,6 @@
 Name:           ocaml-sedlex
 Version:        1.99.4
-Release:        6%{?dist}
+Release:        7%{?dist}
 Summary:        Unicode-friendly lexer generator
 
 License:        MIT
@@ -9,12 +9,15 @@ Source0:        https://github.com/alainfrisch/sedlex/archive/v%{version}/%{name
 
 # add -g when calling ocamlopt
 Patch0:         native_debug.diff
+# https://github.com/ocaml-community/sedlex/issues/64
+Patch1:         ppx_tools_versioned.diff
 
 BuildRequires:  ocaml
 BuildRequires:  ocaml-findlib
 BuildRequires:  ocaml-ocamldoc
 BuildRequires:  ocaml-result-devel
 BuildRequires:  ocaml-migrate-parsetree-devel
+BuildRequires:  ocaml-ppx-derivers-devel
 BuildRequires:  ocaml-ppx-tools-versioned-devel
 BuildRequires:  ocaml-gen-devel
 
@@ -37,6 +40,7 @@ files for developing applications that use %{name}.
 %prep
 %setup -q -n sedlex-%{version}
 %patch0 -p1
+%patch1 -p1
 
 # spurious-executable-perm
 chmod a-x src/syntax/sedlex_cset.ml
@@ -86,6 +90,9 @@ find $RPM_BUILD_ROOT -name '*.{cmxs,opt}' -exec chmod 0755 {} \;
 
 
 %changelog
+* Tue Aug 08 2019 Andy Li <andy@onthewings.net> - 1.99.4-7
+- Add ppx_tools_versioned.diff, fix build.
+
 * Thu Jul 25 2019 Fedora Release Engineering <releng@fedoraproject.org> - 1.99.4-6
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_31_Mass_Rebuild
 
diff --git a/ppx_tools_versioned.diff b/ppx_tools_versioned.diff
new file mode 100644
index 0000000..04158ab
--- /dev/null
+++ b/ppx_tools_versioned.diff
@@ -0,0 +1,11 @@
+--- sedlex-1.99.4/src/syntax/Makefile.orig	2018-10-25 07:55:34.821346628 +0000
++++ sedlex-1.99.4/src/syntax/Makefile	2018-10-25 07:58:42.761346628 +0000
+@@ -8,7 +8,7 @@
+ 
+ OCAMLC=ocamlfind ocamlc
+ OCAMLOPT=ocamlfind ocamlopt -g
+-PACKAGES=-package ppx_tools_versioned.metaquot_405 -package ocaml-migrate-parsetree
++PACKAGES=-package ppx_tools_versioned.metaquot_405 -package ocaml-migrate-parsetree -package ppx_tools_versioned
+ OCAMLFLAGS=$(PACKAGES) -linkall -w +A-4-9-42 -annot
+ 
+ all: ppx_sedlex$(EXE) sedlex.cma