diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..148f45b
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+/num-bigint-0.1.40.crate
diff --git a/num-bigint-0.1.40-fix-metadata.diff b/num-bigint-0.1.40-fix-metadata.diff
new file mode 100644
index 0000000..b50b9bf
--- /dev/null
+++ b/num-bigint-0.1.40-fix-metadata.diff
@@ -0,0 +1,14 @@
+--- num-bigint-0.1.40/Cargo.toml	2017-07-15T02:31:37+02:00
++++ num-bigint-0.1.40/Cargo.toml	2017-11-07T23:19:53.044943+01:00
+@@ -13,11 +13,9 @@
+ [dependencies]
+ 
+ [dependencies.num-integer]
+-path = "../integer"
+ version = "0.1.32"
+ 
+ [dependencies.num-traits]
+-path = "../traits"
+ version = "0.1.32"
+ 
+ [dependencies.rand]
diff --git a/rust-num-bigint.spec b/rust-num-bigint.spec
new file mode 100644
index 0000000..43b04c9
--- /dev/null
+++ b/rust-num-bigint.spec
@@ -0,0 +1,79 @@
+# Generated by rust2rpm
+%bcond_without check
+%global debug_package %{nil}
+
+%global crate num-bigint
+
+Name:           rust-%{crate}
+Version:        0.1.40
+Release:        1%{?dist}
+Summary:        Big integer implementation for Rust
+
+License:        MIT or ASL 2.0
+URL:            https://crates.io/crates/num-bigint
+Source0:        https://crates.io/api/v1/crates/%{crate}/%{version}/download#/%{crate}-%{version}.crate
+# Initial patched metadata
+# * No paths
+Patch0:         num-bigint-0.1.40-fix-metadata.diff
+
+ExclusiveArch:  %{rust_arches}
+
+BuildRequires:  rust-packaging
+# [dependencies]
+BuildRequires:  (crate(num-integer) >= 0.1.32 with crate(num-integer) < 0.2.0)
+BuildRequires:  (crate(num-traits) >= 0.1.32 with crate(num-traits) < 0.2.0)
+BuildRequires:  (crate(rand) >= 0.3.14 with crate(rand) < 0.4.0)
+BuildRequires:  (crate(rustc-serialize) >= 0.3.19 with crate(rustc-serialize) < 0.4.0)
+BuildRequires:  (crate(serde) >= 0.7.0 with crate(serde) < 0.9.0)
+%if %{with check}
+# [dev-dependencies]
+BuildRequires:  (crate(rand) >= 0.3.14 with crate(rand) < 0.4.0)
+%endif
+
+%description
+%{summary}.
+
+%package        devel
+Summary:        %{summary}
+BuildArch:      noarch
+
+%description    devel
+Big integer implementation for Rust.
+
+This package contains library source intended for building other packages
+which use %{crate} from crates.io.
+
+%prep
+%autosetup -n %{crate}-%{version} -p1
+%cargo_prep
+
+%build
+%cargo_build
+
+%install
+%cargo_install
+
+%if %{with check}
+%check
+%cargo_test
+%endif
+
+%files          devel
+%license LICENSE-MIT LICENSE-APACHE
+%{cargo_registry}/%{crate}-%{version}/
+
+%changelog
+* Tue Nov 07 2017 Igor Gnatenko <ignatenkobrain@fedoraproject.org> - 0.1.40-1
+- Update to 0.1.40
+
+* Thu Jun 15 2017 Igor Gnatenko <ignatenkobrain@fedoraproject.org> - 0.1.39-1
+- Update to 0.1.39
+
+* Wed Jun 14 2017 Igor Gnatenko <ignatenkobrain@fedoraproject.org> - 0.1.37-2
+- Port to use rust-packaging
+
+* Wed Mar 15 2017 Igor Gnatenko <ignatenkobrain@fedoraproject.org> - 0.1.37-1
+- Update to 0.1.37
+
+* Thu Mar 02 2017 Igor Gnatenko <ignatenkobrain@fedoraproject.org> - 0.1.36-1
+- Initial package
diff --git a/sources b/sources
new file mode 100644
index 0000000..55b09f0
--- /dev/null
+++ b/sources
@@ -0,0 +1 @@
+SHA512 (num-bigint-0.1.40.crate) = aa8d48860ff31d9c2a0313e5984098a21948bcbf11fe4cfbcfe5d66a4eb03c9b4525416da615ab8d41bf94681af3ea223e55e63b60c6e292661c39c4e3f686eb