diff --git a/rust-num-rational.spec b/rust-num-rational.spec
index 99799fb..3d8f835 100644
--- a/rust-num-rational.spec
+++ b/rust-num-rational.spec
@@ -6,37 +6,133 @@
 
 Name:           rust-%{crate}
 Version:        0.2.1
-Release:        4%{?dist}
+Release:        5%{?dist}
 Summary:        Rational numbers implementation for Rust
 
+# Upstream license specification: MIT/Apache-2.0
 License:        MIT or ASL 2.0
 URL:            https://crates.io/crates/num-rational
-Source0:        https://crates.io/api/v1/crates/%{crate}/%{version}/download#/%{crate}-%{version}.crate
+Source:         %{crates_source}
 
 ExclusiveArch:  %{rust_arches}
 
 BuildRequires:  rust-packaging
-# [dependencies]
 BuildRequires:  (crate(num-bigint) >= 0.2.0 with crate(num-bigint) < 0.3.0)
+BuildRequires:  (crate(num-bigint/std) >= 0.2.0 with crate(num-bigint/std) < 0.3.0)
 BuildRequires:  (crate(num-integer) >= 0.1.38 with crate(num-integer) < 0.2.0)
+BuildRequires:  (crate(num-integer/i128) >= 0.1.38 with crate(num-integer/i128) < 0.2.0)
+BuildRequires:  (crate(num-integer/std) >= 0.1.38 with crate(num-integer/std) < 0.2.0)
 BuildRequires:  (crate(num-traits) >= 0.2.4 with crate(num-traits) < 0.3.0)
+BuildRequires:  (crate(num-traits/i128) >= 0.2.4 with crate(num-traits/i128) < 0.3.0)
+BuildRequires:  (crate(num-traits/std) >= 0.2.4 with crate(num-traits/std) < 0.3.0)
 BuildRequires:  (crate(serde) >= 1.0.0 with crate(serde) < 2.0.0)
 
-%description
-%{summary}.
+%global _description \
+Rational numbers implementation for Rust.
+
+%description %{_description}
 
 %package        devel
 Summary:        %{summary}
 BuildArch:      noarch
 
-%description    devel
-Rational numbers implementation for Rust.
+%description    devel %{_description}
+
+This package contains library source intended for building other packages
+which use "%{crate}" crate.
+
+%files          devel
+%license LICENSE-MIT LICENSE-APACHE
+%doc README.md RELEASES.md
+%{cargo_registry}/%{crate}-%{version}/
+%exclude %{cargo_registry}/%{crate}-%{version}/{bors.toml,ci}
+
+%package     -n %{name}+default-devel
+Summary:        %{summary}
+BuildArch:      noarch
+
+%description -n %{name}+default-devel %{_description}
+
+This package contains library source intended for building other packages
+which use "default" feature of "%{crate}" crate.
+
+%files       -n %{name}+default-devel
+%ghost %{cargo_registry}/%{crate}-%{version}/Cargo.toml
+
+%package     -n %{name}+bigint-devel
+Summary:        %{summary}
+BuildArch:      noarch
+
+%description -n %{name}+bigint-devel %{_description}
+
+This package contains library source intended for building other packages
+which use "bigint" feature of "%{crate}" crate.
+
+%files       -n %{name}+bigint-devel
+%ghost %{cargo_registry}/%{crate}-%{version}/Cargo.toml
+
+%package     -n %{name}+bigint-std-devel
+Summary:        %{summary}
+BuildArch:      noarch
+
+%description -n %{name}+bigint-std-devel %{_description}
+
+This package contains library source intended for building other packages
+which use "bigint-std" feature of "%{crate}" crate.
+
+%files       -n %{name}+bigint-std-devel
+%ghost %{cargo_registry}/%{crate}-%{version}/Cargo.toml
+
+%package     -n %{name}+i128-devel
+Summary:        %{summary}
+BuildArch:      noarch
+
+%description -n %{name}+i128-devel %{_description}
+
+This package contains library source intended for building other packages
+which use "i128" feature of "%{crate}" crate.
+
+%files       -n %{name}+i128-devel
+%ghost %{cargo_registry}/%{crate}-%{version}/Cargo.toml
+
+%package     -n %{name}+num-bigint-devel
+Summary:        %{summary}
+BuildArch:      noarch
+
+%description -n %{name}+num-bigint-devel %{_description}
+
+This package contains library source intended for building other packages
+which use "num-bigint" feature of "%{crate}" crate.
+
+%files       -n %{name}+num-bigint-devel
+%ghost %{cargo_registry}/%{crate}-%{version}/Cargo.toml
+
+%package     -n %{name}+serde-devel
+Summary:        %{summary}
+BuildArch:      noarch
+
+%description -n %{name}+serde-devel %{_description}
 
 This package contains library source intended for building other packages
-which use %{crate} from crates.io.
+which use "serde" feature of "%{crate}" crate.
+
+%files       -n %{name}+serde-devel
+%ghost %{cargo_registry}/%{crate}-%{version}/Cargo.toml
+
+%package     -n %{name}+std-devel
+Summary:        %{summary}
+BuildArch:      noarch
+
+%description -n %{name}+std-devel %{_description}
+
+This package contains library source intended for building other packages
+which use "std" feature of "%{crate}" crate.
+
+%files       -n %{name}+std-devel
+%ghost %{cargo_registry}/%{crate}-%{version}/Cargo.toml
 
 %prep
-%autosetup -n %{crate}-%{version} -p1
+%autosetup -n %{crate}-%{version_no_tilde} -p1
 %cargo_prep
 
 %build
@@ -50,13 +146,10 @@ which use %{crate} from crates.io.
 %cargo_test
 %endif
 
-%files          devel
-%license LICENSE-MIT LICENSE-APACHE
-%doc README.md RELEASES.md
-%{cargo_registry}/%{crate}-%{version}/
-%exclude %{cargo_registry}/%{crate}-%{version}/{bors.toml,ci}
-
 %changelog
+* Sun Feb 10 2019 Igor Gnatenko <ignatenkobrain@fedoraproject.org> - 0.2.1-5
+- Initial package
+
 * Sat Feb 09 2019 Igor Gnatenko <ignatenkobrain@fedoraproject.org> - 0.2.1-4
 - Run tests in infrastructure