diff --git a/calendar-2.03.2-enable-debug.patch b/calendar-2.03.2-enable-debug.patch
new file mode 100644
index 0000000..6fc0d02
--- /dev/null
+++ b/calendar-2.03.2-enable-debug.patch
@@ -0,0 +1,11 @@
+--- calendar-2.03.2/Makefile.in.old	2013-09-14 16:15:43.760253519 +0100
++++ calendar-2.03.2/Makefile.in	2013-09-14 16:16:03.233279962 +0100
+@@ -86,7 +86,7 @@
+ 
+ CAMLIBS	= $(addprefix -I , $(DIRS))
+ 
+-CAMLFLAGS= $(CAMLIBS)
++CAMLFLAGS= -g $(CAMLIBS)
+ BYTEFLAGS= $(CAMLFLAGS)
+ LINK_OPTFLAGS = $(CAMLFLAGS) -noassert
+ OPTFLAGS = $(LINK_OPTFLAGS) -for-pack CalendarLib
diff --git a/calendar-2.04.tar.gz b/calendar-2.04.tar.gz
new file mode 100644
index 0000000..72535b7
Binary files /dev/null and b/calendar-2.04.tar.gz differ
diff --git a/ocaml-calendar.spec b/ocaml-calendar.spec
new file mode 100644
index 0000000..a8e5fa8
--- /dev/null
+++ b/ocaml-calendar.spec
@@ -0,0 +1,59 @@
+Name:           ocaml-calendar
+Version:        2.04
+Release:        18
+Summary:        An Objective Caml library for handling dates and times
+License:        LGPLv2
+URL:            http://calendar.forge.ocamlcore.org/
+Source0:        https://forge.ocamlcore.org/frs/download.php/1481/calendar-2.04.tar.gz
+
+Patch0001:      calendar-2.03.2-enable-debug.patch
+
+BuildRequires:  gawk ocaml >= 4.00.1 ocaml-findlib-devel >= 1.3.3-3 ocaml-ocamldoc
+
+%description
+The Calendar Library (Calendar for short) is an Objective Caml library for handling dates and times
+in your program.
+
+Calendar mainly implements 3 datatypes:
+Date: year/month/day with support for under-specified dates "year/month" or "year" only and support
+for Gregorian and Julian calendar
+Time: hour/minute/second with support for time zones
+Calendar: Date + Time
+
+Seconds can be either integers or floats (different implementations are provided). The library also
+comes with:
+Printers and parsers
+Period: an interval between two dates or two times or two calendars
+
+%package        devel
+Summary:        Development documents for %{name}
+Requires:       %{name} = %{version}-%{release}
+
+%description    devel
+The package provides libraries and some other development documents for developing applications
+that use %{name}.
+
+%prep
+%autosetup -p1 -n calendar-%{version}
+
+%build
+%configure --libdir=%{_libdir}
+make
+make doc
+
+%install
+export DESTDIR=$RPM_BUILD_ROOT OCAMLFIND_DESTDIR=$RPM_BUILD_ROOT%{_libdir}/ocaml
+install -d $OCAMLFIND_DESTDIR/stublibs
+make install
+
+%files
+%doc CHANGES COPYING LGPL README TODO calendarFAQ-2.6.txt doc/*
+%{_libdir}/ocaml/calendar
+%exclude %{_libdir}/ocaml/calendar/*.{cmx,mli}
+
+%files devel
+%{_libdir}/ocaml/calendar/*.{cmx,mli}
+
+%changelog
+* Wed Feb 26 2020 zhouyihang<zhouyihang1@huawei.com> - 2.04-18
+- Package init