diff --git a/rust2rpm/generator.py b/rust2rpm/generator.py
index 49958f2..c6c68c0 100644
--- a/rust2rpm/generator.py
+++ b/rust2rpm/generator.py
@@ -185,7 +185,8 @@ def spec_render_crate(
             conf_key = f"lib+{feature}"
             if requires_features := tomlconf.requires_features:
                 conf_lib_requires[conf_key] = requires_features.get(feature) or list()
-            conf_lib_requires[conf_key] = list()
+            else:
+                conf_lib_requires[conf_key] = list()
 
     if features_hide := tomlconf.features_hide:
         for feature in features_hide:
diff --git a/rust2rpm/tests/samples/glib-sys-0.17.2.fedora.spec b/rust2rpm/tests/samples/glib-sys-0.17.2.fedora.spec
index 4ec80a9..bcd10f7 100644
--- a/rust2rpm/tests/samples/glib-sys-0.17.2.fedora.spec
+++ b/rust2rpm/tests/samples/glib-sys-0.17.2.fedora.spec
@@ -70,6 +70,7 @@ use the "dox" feature of the "%{crate}" crate.
 %package     -n %{name}+v2_58-devel
 Summary:        %{summary}
 BuildArch:      noarch
+Requires:       pkgconfig(glib-2.0) >= 2.58
 
 %description -n %{name}+v2_58-devel %{_description}
 
@@ -82,6 +83,7 @@ use the "v2_58" feature of the "%{crate}" crate.
 %package     -n %{name}+v2_60-devel
 Summary:        %{summary}
 BuildArch:      noarch
+Requires:       pkgconfig(glib-2.0) >= 2.60
 
 %description -n %{name}+v2_60-devel %{_description}
 
@@ -94,6 +96,7 @@ use the "v2_60" feature of the "%{crate}" crate.
 %package     -n %{name}+v2_62-devel
 Summary:        %{summary}
 BuildArch:      noarch
+Requires:       pkgconfig(glib-2.0) >= 2.62
 
 %description -n %{name}+v2_62-devel %{_description}
 
@@ -106,6 +109,7 @@ use the "v2_62" feature of the "%{crate}" crate.
 %package     -n %{name}+v2_64-devel
 Summary:        %{summary}
 BuildArch:      noarch
+Requires:       pkgconfig(glib-2.0) >= 2.64
 
 %description -n %{name}+v2_64-devel %{_description}
 
@@ -118,6 +122,7 @@ use the "v2_64" feature of the "%{crate}" crate.
 %package     -n %{name}+v2_66-devel
 Summary:        %{summary}
 BuildArch:      noarch
+Requires:       pkgconfig(glib-2.0) >= 2.66
 
 %description -n %{name}+v2_66-devel %{_description}
 
@@ -130,6 +135,7 @@ use the "v2_66" feature of the "%{crate}" crate.
 %package     -n %{name}+v2_68-devel
 Summary:        %{summary}
 BuildArch:      noarch
+Requires:       pkgconfig(glib-2.0) >= 2.68
 
 %description -n %{name}+v2_68-devel %{_description}
 
@@ -142,6 +148,7 @@ use the "v2_68" feature of the "%{crate}" crate.
 %package     -n %{name}+v2_70-devel
 Summary:        %{summary}
 BuildArch:      noarch
+Requires:       pkgconfig(glib-2.0) >= 2.70
 
 %description -n %{name}+v2_70-devel %{_description}
 
@@ -154,6 +161,7 @@ use the "v2_70" feature of the "%{crate}" crate.
 %package     -n %{name}+v2_72-devel
 Summary:        %{summary}
 BuildArch:      noarch
+Requires:       pkgconfig(glib-2.0) >= 2.72
 
 %description -n %{name}+v2_72-devel %{_description}
 
@@ -166,6 +174,7 @@ use the "v2_72" feature of the "%{crate}" crate.
 %package     -n %{name}+v2_74-devel
 Summary:        %{summary}
 BuildArch:      noarch
+Requires:       pkgconfig(glib-2.0) >= 2.74
 
 %description -n %{name}+v2_74-devel %{_description}
 
diff --git a/rust2rpm/tests/samples/glib-sys-0.17.2.mageia.spec b/rust2rpm/tests/samples/glib-sys-0.17.2.mageia.spec
index ea71ffc..6468cd8 100644
--- a/rust2rpm/tests/samples/glib-sys-0.17.2.mageia.spec
+++ b/rust2rpm/tests/samples/glib-sys-0.17.2.mageia.spec
@@ -85,6 +85,7 @@ use the "dox" feature of the "%{crate}" crate.
 Summary:        %{summary}
 Group:          Development/Rust
 BuildArch:      noarch
+Requires:       pkgconfig(glib-2.0) >= 2.58
 
 %description -n %{name}+v2_58-devel %{_description}
 
@@ -98,6 +99,7 @@ use the "v2_58" feature of the "%{crate}" crate.
 Summary:        %{summary}
 Group:          Development/Rust
 BuildArch:      noarch
+Requires:       pkgconfig(glib-2.0) >= 2.60
 
 %description -n %{name}+v2_60-devel %{_description}
 
@@ -111,6 +113,7 @@ use the "v2_60" feature of the "%{crate}" crate.
 Summary:        %{summary}
 Group:          Development/Rust
 BuildArch:      noarch
+Requires:       pkgconfig(glib-2.0) >= 2.62
 
 %description -n %{name}+v2_62-devel %{_description}
 
@@ -124,6 +127,7 @@ use the "v2_62" feature of the "%{crate}" crate.
 Summary:        %{summary}
 Group:          Development/Rust
 BuildArch:      noarch
+Requires:       pkgconfig(glib-2.0) >= 2.64
 
 %description -n %{name}+v2_64-devel %{_description}
 
@@ -137,6 +141,7 @@ use the "v2_64" feature of the "%{crate}" crate.
 Summary:        %{summary}
 Group:          Development/Rust
 BuildArch:      noarch
+Requires:       pkgconfig(glib-2.0) >= 2.66
 
 %description -n %{name}+v2_66-devel %{_description}
 
@@ -150,6 +155,7 @@ use the "v2_66" feature of the "%{crate}" crate.
 Summary:        %{summary}
 Group:          Development/Rust
 BuildArch:      noarch
+Requires:       pkgconfig(glib-2.0) >= 2.68
 
 %description -n %{name}+v2_68-devel %{_description}
 
@@ -163,6 +169,7 @@ use the "v2_68" feature of the "%{crate}" crate.
 Summary:        %{summary}
 Group:          Development/Rust
 BuildArch:      noarch
+Requires:       pkgconfig(glib-2.0) >= 2.70
 
 %description -n %{name}+v2_70-devel %{_description}
 
@@ -176,6 +183,7 @@ use the "v2_70" feature of the "%{crate}" crate.
 Summary:        %{summary}
 Group:          Development/Rust
 BuildArch:      noarch
+Requires:       pkgconfig(glib-2.0) >= 2.72
 
 %description -n %{name}+v2_72-devel %{_description}
 
@@ -189,6 +197,7 @@ use the "v2_72" feature of the "%{crate}" crate.
 Summary:        %{summary}
 Group:          Development/Rust
 BuildArch:      noarch
+Requires:       pkgconfig(glib-2.0) >= 2.74
 
 %description -n %{name}+v2_74-devel %{_description}
 
diff --git a/rust2rpm/tests/samples/glib-sys-0.17.2.opensuse.spec b/rust2rpm/tests/samples/glib-sys-0.17.2.opensuse.spec
index ec909e8..924f785 100644
--- a/rust2rpm/tests/samples/glib-sys-0.17.2.opensuse.spec
+++ b/rust2rpm/tests/samples/glib-sys-0.17.2.opensuse.spec
@@ -102,6 +102,7 @@ use the "dox" feature of the "%{crate}" crate.
 Summary:        %{summary}
 Group:          Development/Libraries/Rust
 BuildArch:      noarch
+Requires:       pkgconfig(glib-2.0) >= 2.58
 
 %description -n %{name}+v2_58-devel %{_description}
 
@@ -115,6 +116,7 @@ use the "v2_58" feature of the "%{crate}" crate.
 Summary:        %{summary}
 Group:          Development/Libraries/Rust
 BuildArch:      noarch
+Requires:       pkgconfig(glib-2.0) >= 2.60
 
 %description -n %{name}+v2_60-devel %{_description}
 
@@ -128,6 +130,7 @@ use the "v2_60" feature of the "%{crate}" crate.
 Summary:        %{summary}
 Group:          Development/Libraries/Rust
 BuildArch:      noarch
+Requires:       pkgconfig(glib-2.0) >= 2.62
 
 %description -n %{name}+v2_62-devel %{_description}
 
@@ -141,6 +144,7 @@ use the "v2_62" feature of the "%{crate}" crate.
 Summary:        %{summary}
 Group:          Development/Libraries/Rust
 BuildArch:      noarch
+Requires:       pkgconfig(glib-2.0) >= 2.64
 
 %description -n %{name}+v2_64-devel %{_description}
 
@@ -154,6 +158,7 @@ use the "v2_64" feature of the "%{crate}" crate.
 Summary:        %{summary}
 Group:          Development/Libraries/Rust
 BuildArch:      noarch
+Requires:       pkgconfig(glib-2.0) >= 2.66
 
 %description -n %{name}+v2_66-devel %{_description}
 
@@ -167,6 +172,7 @@ use the "v2_66" feature of the "%{crate}" crate.
 Summary:        %{summary}
 Group:          Development/Libraries/Rust
 BuildArch:      noarch
+Requires:       pkgconfig(glib-2.0) >= 2.68
 
 %description -n %{name}+v2_68-devel %{_description}
 
@@ -180,6 +186,7 @@ use the "v2_68" feature of the "%{crate}" crate.
 Summary:        %{summary}
 Group:          Development/Libraries/Rust
 BuildArch:      noarch
+Requires:       pkgconfig(glib-2.0) >= 2.70
 
 %description -n %{name}+v2_70-devel %{_description}
 
@@ -193,6 +200,7 @@ use the "v2_70" feature of the "%{crate}" crate.
 Summary:        %{summary}
 Group:          Development/Libraries/Rust
 BuildArch:      noarch
+Requires:       pkgconfig(glib-2.0) >= 2.72
 
 %description -n %{name}+v2_72-devel %{_description}
 
@@ -206,6 +214,7 @@ use the "v2_72" feature of the "%{crate}" crate.
 Summary:        %{summary}
 Group:          Development/Libraries/Rust
 BuildArch:      noarch
+Requires:       pkgconfig(glib-2.0) >= 2.74
 
 %description -n %{name}+v2_74-devel %{_description}
 
diff --git a/rust2rpm/tests/samples/glib-sys-0.17.2.plain.spec b/rust2rpm/tests/samples/glib-sys-0.17.2.plain.spec
index 3122321..54054fa 100644
--- a/rust2rpm/tests/samples/glib-sys-0.17.2.plain.spec
+++ b/rust2rpm/tests/samples/glib-sys-0.17.2.plain.spec
@@ -94,6 +94,7 @@ BuildArch:      noarch
 Provides:       crate(glib-sys/v2_58) = 0.17.2
 Requires:       cargo
 Requires:       crate(glib-sys) = 0.17.2
+Requires:       pkgconfig(glib-2.0) >= 2.58
 
 %description -n %{name}+v2_58-devel %{_description}
 
@@ -110,6 +111,7 @@ Provides:       crate(glib-sys/v2_60) = 0.17.2
 Requires:       cargo
 Requires:       crate(glib-sys) = 0.17.2
 Requires:       crate(glib-sys/v2_58) = 0.17.2
+Requires:       pkgconfig(glib-2.0) >= 2.60
 
 %description -n %{name}+v2_60-devel %{_description}
 
@@ -126,6 +128,7 @@ Provides:       crate(glib-sys/v2_62) = 0.17.2
 Requires:       cargo
 Requires:       crate(glib-sys) = 0.17.2
 Requires:       crate(glib-sys/v2_60) = 0.17.2
+Requires:       pkgconfig(glib-2.0) >= 2.62
 
 %description -n %{name}+v2_62-devel %{_description}
 
@@ -142,6 +145,7 @@ Provides:       crate(glib-sys/v2_64) = 0.17.2
 Requires:       cargo
 Requires:       crate(glib-sys) = 0.17.2
 Requires:       crate(glib-sys/v2_62) = 0.17.2
+Requires:       pkgconfig(glib-2.0) >= 2.64
 
 %description -n %{name}+v2_64-devel %{_description}
 
@@ -158,6 +162,7 @@ Provides:       crate(glib-sys/v2_66) = 0.17.2
 Requires:       cargo
 Requires:       crate(glib-sys) = 0.17.2
 Requires:       crate(glib-sys/v2_64) = 0.17.2
+Requires:       pkgconfig(glib-2.0) >= 2.66
 
 %description -n %{name}+v2_66-devel %{_description}
 
@@ -174,6 +179,7 @@ Provides:       crate(glib-sys/v2_68) = 0.17.2
 Requires:       cargo
 Requires:       crate(glib-sys) = 0.17.2
 Requires:       crate(glib-sys/v2_66) = 0.17.2
+Requires:       pkgconfig(glib-2.0) >= 2.68
 
 %description -n %{name}+v2_68-devel %{_description}
 
@@ -190,6 +196,7 @@ Provides:       crate(glib-sys/v2_70) = 0.17.2
 Requires:       cargo
 Requires:       crate(glib-sys) = 0.17.2
 Requires:       crate(glib-sys/v2_68) = 0.17.2
+Requires:       pkgconfig(glib-2.0) >= 2.70
 
 %description -n %{name}+v2_70-devel %{_description}
 
@@ -206,6 +213,7 @@ Provides:       crate(glib-sys/v2_72) = 0.17.2
 Requires:       cargo
 Requires:       crate(glib-sys) = 0.17.2
 Requires:       crate(glib-sys/v2_70) = 0.17.2
+Requires:       pkgconfig(glib-2.0) >= 2.72
 
 %description -n %{name}+v2_72-devel %{_description}
 
@@ -222,6 +230,7 @@ Provides:       crate(glib-sys/v2_74) = 0.17.2
 Requires:       cargo
 Requires:       crate(glib-sys) = 0.17.2
 Requires:       crate(glib-sys/v2_72) = 0.17.2
+Requires:       pkgconfig(glib-2.0) >= 2.74
 
 %description -n %{name}+v2_74-devel %{_description}