diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..57789d0
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+/ocaml-sedlex-1.99.4.tar.gz
diff --git a/README.md b/README.md
deleted file mode 100644
index 7ef7c51..0000000
--- a/README.md
+++ /dev/null
@@ -1,3 +0,0 @@
-# ocaml-sedlex
-
-The ocaml-sedlex package
\ No newline at end of file
diff --git a/native_debug.diff b/native_debug.diff
new file mode 100644
index 0000000..9f99f50
--- /dev/null
+++ b/native_debug.diff
@@ -0,0 +1,29 @@
+diff --git a/src/lib/Makefile b/src/lib/Makefile
+index 0544095..e584557 100644
+--- a/src/lib/Makefile
++++ b/src/lib/Makefile
+@@ -12,8 +12,8 @@ sedlexing.cma: $(MODS:.cmo=.mli) $(MODS:.cmo=.ml)
+ 	ocamlfind ocamlc -package gen -a -o sedlexing.cma $(MODS)
+
+ sedlexing.cmxa: $(MODS:.cmo=.mli) $(MODS:.cmo=.ml)
+-	ocamlfind ocamlopt -package gen -safe-string -c $(MODS:.cmo=.mli) $(MODS:.cmo=.ml)
+-	ocamlfind ocamlopt -package gen -a -o sedlexing.cmxa $(MODS:.cmo=.cmx)
++	ocamlfind ocamlopt -g -package gen -safe-string -c $(MODS:.cmo=.mli) $(MODS:.cmo=.ml)
++	ocamlfind ocamlopt -g -package gen -a -o sedlexing.cmxa $(MODS:.cmo=.cmx)
+
+ doc:
+ 	rm -rf ../../libdoc
+diff --git a/src/syntax/Makefile b/src/syntax/Makefile
+index ec5b86f..f5d1016 100644
+--- a/src/syntax/Makefile
++++ b/src/syntax/Makefile
+@@ -7,7 +7,7 @@ include $(shell ocamlc -where)/Makefile.config
+ SRCS=sedlex_cset.mli sedlex_cset.ml unicode63.mli unicode63.ml sedlex.mli sedlex.ml ppx_sedlex.ml
+
+ OCAMLC=ocamlfind ocamlc
+-OCAMLOPT=ocamlfind ocamlopt
++OCAMLOPT=ocamlfind ocamlopt -g
+ PACKAGES=-package ppx_tools_versioned.metaquot_405 -package ocaml-migrate-parsetree
+ OCAMLFLAGS=$(PACKAGES) -linkall -w +A-4-9-42 -annot
+
+
diff --git a/ocaml-sedlex.spec b/ocaml-sedlex.spec
new file mode 100644
index 0000000..2ee9b02
--- /dev/null
+++ b/ocaml-sedlex.spec
@@ -0,0 +1,91 @@
+Name:           ocaml-sedlex
+Version:        1.99.4
+Release:        1%{?dist}
+Summary:        Unicode-friendly lexer generator
+
+License:        MIT
+URL:            https://github.com/alainfrisch/sedlex
+Source0:        https://github.com/alainfrisch/sedlex/archive/v%{version}/%{name}-%{version}.tar.gz
+
+# add -g when calling ocamlopt
+Patch0:         native_debug.diff
+
+BuildRequires:  ocaml
+BuildRequires:  ocaml-findlib
+BuildRequires:  ocaml-ocamldoc
+BuildRequires:  ocaml-result-devel
+BuildRequires:  ocaml-migrate-parsetree-devel
+BuildRequires:  ocaml-ppx-tools-versioned-devel
+BuildRequires:  ocaml-gen-devel
+
+%description
+A lexer generator for OCaml, similar to ocamllex, but supporting Unicode.
+Contrary to ocamllex, lexer specifications for sedlex are embedded in
+regular OCaml source files.
+
+
+%package        devel
+Summary:        Development files for %{name}
+Group:          Development/Libraries
+Requires:       %{name}%{?_isa} = %{version}-%{release}
+
+
+%description    devel
+The %{name}-devel package contains libraries and signature
+files for developing applications that use %{name}.
+
+
+%prep
+%setup -q -n sedlex-%{version}
+%patch0 -p1
+
+# spurious-executable-perm
+chmod a-x src/syntax/sedlex_cset.ml
+
+%build
+%make_build
+
+%ifarch %{ocaml_native_compiler}
+%make_build opt
+%endif
+
+%install
+export DESTDIR=$RPM_BUILD_ROOT
+export OCAMLFIND_DESTDIR=$RPM_BUILD_ROOT%{_libdir}/ocaml
+mkdir -p $OCAMLFIND_DESTDIR
+
+# don't use make_install macro since it passes INSTALL,
+# which is used differently in the Makefile
+%ifarch %{ocaml_native_compiler}
+make install
+%else
+make install_byteonly
+%endif
+
+# Makes *.cmxs and *.opt executable such that they will be stripped.
+find $RPM_BUILD_ROOT -name '*.{cmxs,opt}' -exec chmod 0755 {} \;
+
+%files
+%doc README.md CHANGES
+%license LICENSE
+%{_libdir}/ocaml/*
+%ifarch %{ocaml_native_compiler}
+%exclude %{_libdir}/ocaml/*/*.a
+%exclude %{_libdir}/ocaml/*/*.cmxa
+%exclude %{_libdir}/ocaml/*/*.cmx
+%endif
+
+
+%files devel
+%doc README.md CHANGES
+%license LICENSE
+%ifarch %{ocaml_native_compiler}
+%{_libdir}/ocaml/*/*.a
+%{_libdir}/ocaml/*/*.cmxa
+%{_libdir}/ocaml/*/*.cmx
+%endif
+
+
+%changelog
+* Fri Jan 12 2018 Andy Li <andy@onthewings.net> - 1.99.4-1
+- Initial RPM release.
diff --git a/sources b/sources
new file mode 100644
index 0000000..3ac5249
--- /dev/null
+++ b/sources
@@ -0,0 +1 @@
+SHA512 (ocaml-sedlex-1.99.4.tar.gz) = 83bddb03e25b015bc71fb59e3b0e0e097e899c681c8033663c17936f28fde8599a82eaab9c26eafd645c401c106e65fcf173d9fb889eb8999eb1b064ff8b6149