diff --git a/Cargo.lock b/Cargo.lock
index baf789d..7639f48 100755
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -418,7 +418,7 @@ checksum = "807800ff3288b621186fe0a8f3392c4652068257302709c24efd918c3dffcdc2"
 
 [[package]]
 name = "depot"
-version = "0.22.0"
+version = "0.22.1"
 dependencies = [
  "anyhow",
  "ar",
@@ -1235,9 +1235,9 @@ dependencies = [
 
 [[package]]
 name = "libsqlite3-sys"
-version = "0.36.0"
+version = "0.37.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "95b4103cffefa72eb8428cb6b47d6627161e51c2739fc5e3b734584157bc642a"
+checksum = "b1f111c8c41e7c61a49cd34e44c7619462967221a6443b0ec299e0ac30cfb9b1"
 dependencies = [
  "pkg-config",
  "vcpkg",
@@ -1304,9 +1304,9 @@ checksum = "5e5032e24019045c762d3c0f28f5b6b8bbf38563a65908389bf7978758920897"
 
 [[package]]
 name = "lz4_flex"
-version = "0.12.0"
+version = "0.13.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ab6473172471198271ff72e9379150e9dfd70d8e533e0752a27e515b48dd375e"
+checksum = "db9a0d582c2874f68138a16ce1867e0ffde6c0bb0a0df85e1f36d04146db488a"
 dependencies = [
  "twox-hash",
 ]
@@ -1740,9 +1740,9 @@ dependencies = [
 
 [[package]]
 name = "rusqlite"
-version = "0.38.0"
+version = "0.39.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f1c93dd1c9683b438c392c492109cb702b8090b2bfc8fed6f6e4eb4523f17af3"
+checksum = "a0d2b0146dd9661bf67bb107c0bb2a55064d556eeb3fc314151b957f313bcd4e"
 dependencies = [
  "bitflags",
  "fallible-iterator",
diff --git a/Cargo.toml b/Cargo.toml
index 5188492..9c0cf0e 100755
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "depot"
-version = "0.22.0"
+version = "0.22.1"
 edition = "2024"
 
 [lints.rust]
@@ -15,7 +15,7 @@ flate2 = "1.1.9"
 git2 = "0.20.4"
 indicatif = "0.18.4"
 nix = { version = "0.31.2", features = ["user"] }
-rusqlite = "0.38.0"
+rusqlite = "0.39.0"
 semver = "1.0.27"
 serde = { version = "1.0.228", features = ["derive"] }
 yaml-rust2 = "0.11.0"
@@ -43,7 +43,7 @@ sys-mount = { version = "3.1.0", default-features = false }
 time = { version = "0.3.47", features = ["formatting", "parsing"] }
 b2sum-rust = "0.3.0"
 serde_ignored = "0.1.14"
-lz4_flex = "0.12.0"
+lz4_flex = "0.13.0"
 lzma-rust2 = "0.16.2"
 signal-hook = "0.4.3"
 
diff --git a/meson.build b/meson.build
index dea1412..e75dce5 100644
--- a/meson.build
+++ b/meson.build
@@ -1,6 +1,6 @@
 project(
   'depot',
-  version: '0.22.0',
+  version: '0.22.1',
   meson_version: '>=0.60.0',
   default_options: ['buildtype=release'],
 )
diff --git a/src/commands.rs b/src/commands.rs
index 99cc287..52b81b1 100644
--- a/src/commands.rs
+++ b/src/commands.rs
@@ -903,15 +903,19 @@ fn maybe_prompt_to_skip_tests_for_missing_requested_deps(
 }
 
 fn requested_outputs(pkg_spec: &package::PackageSpec, lib32_only: bool) -> deps::RequestedOutputs {
-    if lib32_only {
+    if effective_lib32_only(pkg_spec, lib32_only) {
         deps::RequestedOutputs::Lib32Only
-    } else if pkg_spec.build.flags.build_32 {
+    } else if pkg_spec.builds_lib32_output() {
         deps::RequestedOutputs::PrimaryAndLib32
     } else {
         deps::RequestedOutputs::PrimaryOnly
     }
 }
 
+fn effective_lib32_only(pkg_spec: &package::PackageSpec, cli_lib32_only: bool) -> bool {
+    cli_lib32_only || pkg_spec.builds_only_lib32_output()
+}
+
 fn should_install_test_deps(
     pkg_spec: &package::PackageSpec,
     install_test_deps: bool,
@@ -1080,7 +1084,7 @@ fn build_lib32_companion_package(
     export_compiler_flags: bool,
     force: bool,
 ) -> Result<Option<(package::PackageSpec, PathBuf)>> {
-    if !pkg_spec.build.flags.build_32 && !force {
+    if !pkg_spec.builds_lib32_output() && !force {
         return Ok(None);
     }
     if pkg_spec.is_metapackage() {
@@ -3217,11 +3221,12 @@ fn execute_install_plan_with_child_commands(
                 let mut spec = package::PackageSpec::from_file(path)
                     .with_context(|| format!("Failed to parse spec {}", path.display()))?;
                 spec.apply_config(config);
-                let lib32_only = step_requests_only_lib32(step, &options);
+                let lib32_only =
+                    effective_lib32_only(&spec, step_requests_only_lib32(step, &options));
                 conflict_subjects.extend(install_conflict_subjects_for_spec(
                     &spec,
                     !lib32_only,
-                    spec.build.flags.build_32 || lib32_only,
+                    spec.builds_lib32_output() || lib32_only,
                 ));
             }
             planner::PlanOrigin::Binary { record, .. } => {
@@ -3750,6 +3755,7 @@ fn run_direct_install_request(
     if options.lib32_only && staging_dir.is_some() {
         anyhow::bail!("--lib32-only is only supported when installing from a package spec");
     }
+    let lib32_only = effective_lib32_only(&pkg_spec, options.lib32_only);
 
     if staging_dir.is_none() && !suppress_output {
         ui::info(format!(
@@ -3758,12 +3764,12 @@ fn run_direct_install_request(
         ));
     }
 
-    let requested_outputs = requested_outputs(&pkg_spec, options.lib32_only);
+    let requested_outputs = requested_outputs(&pkg_spec, lib32_only);
 
     let mut conflict_subjects = install_conflict_subjects_for_spec(
         &pkg_spec,
-        !options.lib32_only,
-        staging_dir.is_none() && (options.lib32_only || pkg_spec.build.flags.build_32),
+        !lib32_only,
+        staging_dir.is_none() && (lib32_only || pkg_spec.builds_lib32_output()),
     );
     if staging_dir.is_some() {
         conflict_subjects = install_conflict_subjects_for_spec(&pkg_spec, true, false);
@@ -3997,7 +4003,7 @@ fn run_direct_install_request(
             .join("destdir")
             .join(&pkg_spec.package.name);
 
-        if !options.lib32_only {
+        if !lib32_only {
             builder::build(
                 &pkg_spec,
                 &src_dir,
@@ -4016,7 +4022,7 @@ fn run_direct_install_request(
 
     let mut transaction_plans = Vec::new();
 
-    if !options.lib32_only {
+    if !lib32_only {
         if staging_dir.is_none() {
             // Source-build path: apply staging transforms (strip/compress/static cleanup).
             staging::process(&destdir, &pkg_spec)?;
@@ -4042,7 +4048,7 @@ fn run_direct_install_request(
             config,
             cross_config.as_ref(),
             !options.no_flags,
-            options.lib32_only,
+            lib32_only,
         )?
     {
         let staged = plan_staged_install(&lib32_spec, &lib32_destdir, options.rootfs, config)?;
@@ -4258,7 +4264,7 @@ pub fn run(cli: Cli) -> Result<()> {
             let cross_prefix = build_exec_args.cross_prefix;
             let clean = build_exec_args.clean;
             let dry_run = build_exec_args.dry_run;
-            let lib32_only = lib32_args.lib32_only;
+            let cli_lib32_only = lib32_args.lib32_only;
             warn_if_running_as_root_for_build("build", &rootfs);
             let spec_path = spec.or(spec_pos).context("No spec file provided")?;
             ui::info(format!("Building package from: {}", spec_path.display()));
@@ -4275,6 +4281,7 @@ pub fn run(cli: Cli) -> Result<()> {
             let build_result: Result<()> = (|| {
                 // Apply system overrides
                 pkg_spec.apply_config(&config);
+                let lib32_only = effective_lib32_only(&pkg_spec, cli_lib32_only);
                 let requested_outputs = requested_outputs(&pkg_spec, lib32_only);
 
                 let build_targets = vec![format!(
@@ -6954,4 +6961,15 @@ optional = []
         assert_eq!(lib32.dependencies.runtime, vec!["lib32-zlib", "pkg"]);
         assert_eq!(lib32.dependencies.optional, vec!["lib32-gtk-doc"]);
     }
+
+    #[test]
+    fn requested_outputs_prefers_lib32_only_spec_flag() {
+        let mut spec = test_package_spec(package::BuildType::Custom, None, &[]);
+        spec.build.flags.lib32_only = true;
+
+        assert_eq!(
+            requested_outputs(&spec, false),
+            deps::RequestedOutputs::Lib32Only
+        );
+    }
 }
diff --git a/src/package/spec.rs b/src/package/spec.rs
index 2156654..41ee568 100755
--- a/src/package/spec.rs
+++ b/src/package/spec.rs
@@ -256,6 +256,16 @@ impl PackageSpec {
         format!("lib32-{}", self.package.name)
     }
 
+    /// Return true when this spec should emit the generated `lib32-*` package.
+    pub fn builds_lib32_output(&self) -> bool {
+        self.build.flags.build_32 || self.build.flags.lib32_only
+    }
+
+    /// Return true when only the generated `lib32-*` package should be emitted.
+    pub fn builds_only_lib32_output(&self) -> bool {
+        self.build.flags.lib32_only
+    }
+
     /// Return the effective dependency set used by the generated lib32 companion package.
     pub fn lib32_dependencies(&self) -> Dependencies {
         let mut deps = self
@@ -819,6 +829,11 @@ impl PackageSpec {
                         self.build.flags.build_32 = b;
                     }
                 }
+                "lib32_only" | "lib32-only" => {
+                    if let Some(b) = toml_value_as_boolish(v) {
+                        self.build.flags.lib32_only = b;
+                    }
+                }
                 "configure_lib32" | "configure-lib32" => {
                     if let Some(arr) = v.as_array() {
                         self.build.flags.configure_lib32 = arr
@@ -1562,6 +1577,11 @@ impl PackageSpec {
                     self.build.flags.build_32 = b;
                 }
             }
+            "lib32_only" | "lib32-only" => {
+                if let Some(b) = values.last().and_then(toml_value_as_boolish) {
+                    self.build.flags.lib32_only = b;
+                }
+            }
             "split_docs" | "split-docs" => {
                 if let Some(b) = values.last().and_then(toml_value_as_boolish) {
                     self.build.flags.split_docs = b;
@@ -3006,6 +3026,7 @@ type = "autotools"
 
 [build.flags]
 "build-32" = "true"
+"lib32-only" = "yes"
 "CFLAGS-lib32" = ["-mstackrealign"]
 "CXXFLAGS-lib32" = ["-fno-rtti"]
 "configure-lib32" = ["--disable-static"]
@@ -3018,6 +3039,9 @@ type = "autotools"
 
         let spec = PackageSpec::from_file(&path).unwrap();
         assert!(spec.build.flags.build_32);
+        assert!(spec.build.flags.lib32_only);
+        assert!(spec.builds_lib32_output());
+        assert!(spec.builds_only_lib32_output());
         assert_eq!(spec.build.flags.cflags_lib32, vec!["-mstackrealign"]);
         assert_eq!(spec.build.flags.cxxflags_lib32, vec!["-fno-rtti"]);
         assert_eq!(spec.build.flags.configure_lib32, vec!["--disable-static"]);
@@ -3911,6 +3935,14 @@ pub struct BuildFlags {
         deserialize_with = "deserialize_boolish"
     )]
     pub build_32: bool,
+    /// Build/install only the generated `lib32-*` companion package output.
+    #[serde(
+        default,
+        alias = "lib32-only",
+        alias = "lib32_only",
+        deserialize_with = "deserialize_boolish"
+    )]
+    pub lib32_only: bool,
     #[serde(default)]
     pub configure: Vec<String>,
     /// PEP 517 config settings for Python builds (each entry is `KEY=VALUE` or `KEY`).
@@ -4215,6 +4247,7 @@ impl Default for BuildFlags {
             no_compress_man: false,
             skip_tests: false,
             build_32: false,
+            lib32_only: false,
             configure: Vec::new(),
             config_settings: Vec::new(),
             configure_lib32: Vec::new(),
diff --git a/src/planner.rs b/src/planner.rs
index 8f85ae6..41381ff 100644
--- a/src/planner.rs
+++ b/src/planner.rs
@@ -622,7 +622,8 @@ fn source_deps_for_install(
     lib32_only: bool,
 ) -> Vec<String> {
     let mut deps_all = Vec::new();
-    let include_lib32 = lib32_only || spec.build.flags.build_32;
+    let lib32_only = lib32_only || spec.builds_only_lib32_output();
+    let include_lib32 = lib32_only || spec.builds_lib32_output();
     let local_provides = spec.local_dependency_provides_for_selection(!lib32_only, include_lib32);
     if !lib32_only && !spec.is_metapackage() {
         for dep in &spec.dependencies.build {
@@ -960,6 +961,26 @@ mod tests {
         assert!(!deps.contains(&"bats".to_string()));
     }
 
+    #[test]
+    fn source_deps_for_install_uses_lib32_only_dependencies_from_spec_flag() {
+        let mut spec = mk_spec();
+        spec.build.flags.lib32_only = true;
+        spec.dependencies.lib32 = Some(crate::package::DependencyGroup {
+            build: vec!["gcc-multilib".into()],
+            runtime: vec!["lib32-zlib".into()],
+            test: vec!["lib32-bats".into()],
+            optional: Vec::new(),
+        });
+
+        let deps = source_deps_for_install(&spec, true, false);
+        assert!(deps.contains(&"gcc-multilib".to_string()));
+        assert!(deps.contains(&"lib32-zlib".to_string()));
+        assert!(deps.contains(&"lib32-bats".to_string()));
+        assert!(!deps.contains(&"make".to_string()));
+        assert!(!deps.contains(&"zlib".to_string()));
+        assert!(!deps.contains(&"bats".to_string()));
+    }
+
     #[test]
     fn candidate_dedup_keeps_highest_priority_origin_for_same_package() {
         let candidates = vec![