diff --git a/.clang-format b/.clang-format
index 99466fb..4bde953 100644
--- a/.clang-format
+++ b/.clang-format
@@ -3,6 +3,7 @@ Language: Cpp
 BasedOnStyle: WebKit
 BinPackArguments: false
 ColumnLimit: 120
+NamespaceIndentation: None
 InsertNewlineAtEOF: true
 InsertTrailingCommas: Wrapped
 IncludeBlocks: Regroup
diff --git a/conanfile.txt b/conanfile.txt
index f9ea18f..7778a6c 100644
--- a/conanfile.txt
+++ b/conanfile.txt
@@ -9,7 +9,7 @@ argparse/2.9
 spdlog/1.11.0
 
 [test_requires]
-gtest/cci.20210126
+gtest/1.16.0
 
 [generators]
 CMakeDeps
diff --git a/include/cppship/cmd/build.h b/include/cppship/cmd/build.h
index d33a0d9..3d8a481 100644
--- a/include/cppship/cmd/build.h
+++ b/include/cppship/cmd/build.h
@@ -1,6 +1,7 @@
 #pragma once
 
 #include <cstdint>
+#include <functional>
 #include <set>
 #include <string>
 #include <thread>
@@ -12,6 +13,7 @@
 #include "cppship/core/manifest.h"
 #include "cppship/core/profile.h"
 #include "cppship/core/workspace.h"
+#include "cppship/util/cmd_runner.h"
 #include "cppship/util/fs.h"
 #include "cppship/util/repo.h"
 
@@ -23,6 +25,7 @@ struct BuildOptions {
     int max_concurrency = gsl::narrow_cast<int>(std::thread::hardware_concurrency());
     Profile profile = Profile::debug;
     bool dry_run = false;
+    std::optional<std::string> package;
     std::optional<std::string> target;
     std::set<BuildGroup> groups;
 };
@@ -57,6 +60,8 @@ struct BuildContext {
     }
 
     [[nodiscard]] bool is_expired(const fs::path& path) const;
+
+    [[nodiscard]] std::optional<std::string> get_active_package() const;
 };
 
 int run_build(const BuildOptions& options);
@@ -72,12 +77,12 @@ void cppship_install(
 
 namespace cmd_internals {
 
-    std::string cmake_gen_config(const BuildContext& ctx, bool for_standalone_cmake = false);
+std::string cmake_gen_config(const BuildContext& ctx, bool for_standalone_cmake = false);
 
 }
 
 void cmake_setup(const BuildContext& ctx);
 
-int cmake_build(const BuildContext& ctx, const BuildOptions& options);
+int cmake_build(const BuildContext& ctx, const BuildOptions& options, const util::CmdRunner& runner = {});
 
 }
diff --git a/include/cppship/core/manifest.h b/include/cppship/core/manifest.h
index 8051406..98c8410 100644
--- a/include/cppship/core/manifest.h
+++ b/include/cppship/core/manifest.h
@@ -67,7 +67,7 @@ class Manifest {
 
     const PackageManifest* get_if_package() const { return std::get_if<PackageManifest>(&packages_); }
 
-    const PackageManifest* get(const fs::path& p) const
+    const PackageManifest* get_by_path(const fs::path& p) const
     {
         const auto* map = std::get_if<1>(&packages_);
         if (map == nullptr) {
@@ -78,15 +78,14 @@ class Manifest {
         return it == map->end() ? nullptr : &it->second;
     }
 
+    const PackageManifest* get(std::string_view package) const;
+
     const auto& list_packages() const { return std::get<1>(packages_); }
 
     const std::vector<DeclaredDependency>& dependencies() const { return mDependencies; }
 
     const std::vector<DeclaredDependency>& dev_dependencies() const { return mDevDependencies; }
 
-private:
-    const PackageManifest& as_package_() const { return std::get<PackageManifest>(packages_); }
-
 private:
     std::variant<std::monostate, std::map<fs::path, PackageManifest>, PackageManifest> packages_;
 
diff --git a/include/cppship/exception.h b/include/cppship/exception.h
index 4f4932e..123b084 100644
--- a/include/cppship/exception.h
+++ b/include/cppship/exception.h
@@ -27,6 +27,18 @@ class CmdNotFound : public Error {
     std::string mCmd;
 };
 
+class InvalidCmdOption : public Error {
+public:
+    explicit InvalidCmdOption(std::string_view option, const std::string& msg)
+        : Error(msg)
+        , mOption(option)
+    {
+    }
+
+private:
+    std::string mOption;
+};
+
 class RunCmdFailed : public Error {
 public:
     RunCmdFailed(const int status, std::string_view cmd)
@@ -54,4 +66,4 @@ class LayoutError : public Error {
     using Error::Error;
 };
 
-}
\ No newline at end of file
+}
diff --git a/include/cppship/util/cmd_runner.h b/include/cppship/util/cmd_runner.h
new file mode 100644
index 0000000..1275574
--- /dev/null
+++ b/include/cppship/util/cmd_runner.h
@@ -0,0 +1,25 @@
+#pragma once
+
+#include <functional>
+#include <string_view>
+
+namespace cppship::util {
+
+class CmdRunner {
+public:
+    CmdRunner() = default;
+
+    template <class Fn>
+        requires(!std::is_same_v<Fn, CmdRunner>)
+    explicit CmdRunner(Fn&& fn)
+        : mHook(std::forward<Fn>(fn))
+    {
+    }
+
+    int run(std::string_view cmd) const;
+
+private:
+    std::function<int(std::string_view)> mHook;
+};
+
+}
diff --git a/include/cppship/util/string.h b/include/cppship/util/string.h
index 4f8f602..0b0bd34 100644
--- a/include/cppship/util/string.h
+++ b/include/cppship/util/string.h
@@ -22,4 +22,9 @@ template <class Input, class Pred> inline auto split(Input&& input, Pred pred)
     return split_to<std::vector>(std::forward<Input>(input), pred);
 }
 
-}
\ No newline at end of file
+inline bool contains(std::string_view corpus, std::string_view patten)
+{
+    return corpus.find(patten) != std::string_view::npos;
+}
+
+}
diff --git a/lib/cmd/build.cpp b/lib/cmd/build.cpp
index f563a4a..cb6e8ca 100644
--- a/lib/cmd/build.cpp
+++ b/lib/cmd/build.cpp
@@ -2,6 +2,7 @@
 
 #include <filesystem>
 #include <fstream>
+#include <optional>
 #include <sstream>
 #include <string>
 
@@ -32,6 +33,7 @@
 #include "cppship/exception.h"
 #include "cppship/util/assert.h"
 #include "cppship/util/cmd.h"
+#include "cppship/util/cmd_runner.h"
 #include "cppship/util/fs.h"
 #include "cppship/util/git.h"
 #include "cppship/util/io.h"
@@ -60,6 +62,17 @@ bool cmd::BuildContext::is_expired(const fs::path& path) const
     return fs::last_write_time(path) < *ranges::max_element(manifest_last_update_times);
 }
 
+std::optional<std::string> cmd::BuildContext::get_active_package() const
+{
+    if (package_root == root) {
+        return std::nullopt;
+    }
+
+    const auto path = fs::relative(package_root, root);
+    const auto* p = manifest.get_by_path(path);
+    return p != nullptr ? std::make_optional<std::string>(p->name()) : std::nullopt;
+}
+
 int cmd::run_build(const BuildOptions& options)
 {
     BuildContext ctx(options.profile);
@@ -173,7 +186,7 @@ void cmd::conan_setup(const BuildContext& ctx)
 
     oss << '\n'
         << "[test_requires]\n"
-        << "gtest/cci.20210126\n"
+        << "gtest/1.16.0\n"
         << "benchmark/1.7.1\n";
     for (const auto& dep : result.conan_dev_dependencies) {
         const auto& desc = std::get<ConanDep>(dep.desc);
@@ -282,7 +295,7 @@ std::string cmd::cmd_internals::cmake_gen_config(const BuildContext& ctx, bool f
     });
 
     for (const auto& [path, layout] : ctx.workspace) {
-        const auto* manifest = ctx.manifest.get(path);
+        const auto* manifest = ctx.manifest.get_by_path(path);
         enforce(manifest != nullptr, "manifest and workspace inconsistent");
 
         gen.add(layout, *manifest, resolved_deps);
@@ -381,10 +394,32 @@ std::string_view to_cmake_group(cmd::BuildGroup group)
     std::abort();
 }
 
+std::string to_cmake_group(cmd::BuildGroup group, const cmd::BuildContext& ctx, const cmd::BuildOptions& options)
+{
+    auto cmake_group = to_cmake_group(group);
+    const auto package = options.package.has_value() ? options.package : ctx.get_active_package();
+    if (!package.has_value()) {
+        return std::string(cmake_group);
+    }
+
+    return fmt::format("{}_{}", *package, cmake_group);
+}
+
+void validate_options(const cmd::BuildContext& ctx, const cmd::BuildOptions& options)
+{
+    if (options.package.has_value()) {
+        if (ctx.manifest.get(*options.package) == nullptr) {
+            throw InvalidCmdOption("package", "invalid package specified by --package");
+        }
+    }
+}
+
 }
 
-int cmd::cmake_build(const BuildContext& ctx, const BuildOptions& options)
+int cmd::cmake_build(const BuildContext& ctx, const BuildOptions& options, const util::CmdRunner& runner)
 {
+    validate_options(ctx, options);
+
     auto cmd = fmt::format("cmake --build {} -j {} --config {}",
         ctx.profile_dir.string(),
         options.max_concurrency,
@@ -392,13 +427,13 @@ int cmd::cmake_build(const BuildContext& ctx, const BuildOptions& options)
     if (options.target) {
         cmd += fmt::format(" --target {}", *options.target);
     } else if (options.groups.empty()) {
-        cmd += fmt::format(" --target {}", cmake::kCppshipGroupBinaries);
+        cmd += fmt::format(" --target {}", to_cmake_group(BuildGroup::binaries, ctx, options));
     } else {
         for (const auto group : options.groups) {
-            cmd += fmt::format(" --target {}", to_cmake_group(group));
+            cmd += fmt::format(" --target {}", to_cmake_group(group, ctx, options));
         }
     }
 
     status("build", "{}", cmd);
-    return run_cmd(cmd);
+    return runner.run(cmd);
 }
diff --git a/lib/core/manifest.cpp b/lib/core/manifest.cpp
index 67f3a11..174caa2 100644
--- a/lib/core/manifest.cpp
+++ b/lib/core/manifest.cpp
@@ -9,7 +9,9 @@
 #include <fmt/os.h>
 #include <range/v3/action/push_back.hpp>
 #include <range/v3/algorithm/any_of.hpp>
+#include <range/v3/algorithm/find.hpp>
 #include <range/v3/view/concat.hpp>
+#include <range/v3/view/filter.hpp>
 #include <toml.hpp>
 #include <toml/get.hpp>
 #include <toml/value.hpp>
@@ -119,7 +121,7 @@ std::vector<DeclaredDependency> parse_dependencies(const toml::value& manifest,
         } else if (dep_config.is_table()) {
             if (dep_config.contains("git")) {
                 GitDep desc;
-                desc.git = find<std::string>(dep_config, "git");
+                desc.git = toml::find<std::string>(dep_config, "git");
                 desc.commit = find_or<std::string>(dep_config, "commit", "");
                 if (desc.git.empty()) {
                     throw Error { fmt::format("invalid git url {}", desc.git) };
@@ -276,7 +278,7 @@ Manifest::Manifest(const fs::path& file)
         std::set<std::string> package_names;
         for (const auto& member : get_list(workspace, "members")) {
             auto package_path = fs::path(member);
-            const auto package_manifest_path = package_path / kRepoConfigFile;
+            const auto package_manifest_path = file.parent_path() / package_path / kRepoConfigFile;
             if (!fs::exists(package_manifest_path)) {
                 throw Error { fmt::format("invalid workspace member {}", member) };
             }
@@ -298,6 +300,23 @@ Manifest::Manifest(const fs::path& file)
     }
 }
 
+const PackageManifest* Manifest::get(std::string_view package) const
+{
+    switch (packages_.index()) {
+    case 1: {
+        const auto& ps = views::values(std::get<1>(packages_));
+        const auto it = find(ps, package, &PackageManifest::name);
+        return it != ps.end() ? &*it : nullptr;
+    }
+    case 2: {
+        const auto& p = std::get<2>(packages_);
+        return p.name() == package ? &p : nullptr;
+    }
+    default:
+        return nullptr;
+    }
+}
+
 void cppship::generate_manifest(std::string_view name, CxxStd std, const fs::path& dir)
 {
     if (!fs::exists(dir)) {
diff --git a/lib/util/cmd_runner.cpp b/lib/util/cmd_runner.cpp
new file mode 100644
index 0000000..81f00ca
--- /dev/null
+++ b/lib/util/cmd_runner.cpp
@@ -0,0 +1,16 @@
+#include "cppship/util/cmd_runner.h"
+
+#include "cppship/util/cmd.h"
+
+namespace cppship::util {
+
+int CmdRunner::run(std::string_view cmd) const
+{
+    if (mHook) {
+        return mHook(cmd);
+    }
+
+    return run_cmd(cmd);
+}
+
+}
diff --git a/src/main.cpp b/src/main.cpp
index c6d83cd..aafed34 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -40,6 +40,8 @@ struct SubCommand {
     int run() { return cmd_runner(parser); }
 };
 
+namespace {
+
 Profile get_profile(const ArgumentParser& cmd)
 {
     if (cmd.is_used("profile")) {
@@ -131,6 +133,7 @@ std::list<SubCommand> build_commands(const ArgumentParser& common)
             .max_concurrency = get_concurrency(cmd),
             .profile = get_profile(cmd),
             .dry_run = cmd.get<bool>("-d"),
+            .package = cmd.present("--package"),
             .groups = groups,
         });
     });
@@ -146,6 +149,7 @@ std::list<SubCommand> build_commands(const ArgumentParser& common)
         .help("dry-run, generate compile_commands.json")
         .default_value(false)
         .implicit_value(true);
+    build.parser.add_argument("--package").help("package to build");
     build.parser.add_argument("--profile").help("build with specific profile").default_value(kProfileDebug);
     build.parser.add_argument("--examples").help("build all examples").default_value(false).implicit_value(true);
     build.parser.add_argument("--tests").help("build all tests").default_value(false).implicit_value(true);
@@ -274,6 +278,8 @@ std::list<SubCommand> build_commands(const ArgumentParser& common)
     return commands;
 }
 
+}
+
 int main(int argc, const char* argv[])
 try {
     spdlog::set_pattern("%v");
@@ -322,4 +328,4 @@ try {
 } catch (const std::exception& e) {
     error("unknown error {}", e.what());
     return EXIT_FAILURE;
-}
\ No newline at end of file
+}
diff --git a/tests/cmd/build.cpp b/tests/cmd/build.cpp
index fba8b3d..72167b3 100644
--- a/tests/cmd/build.cpp
+++ b/tests/cmd/build.cpp
@@ -2,8 +2,13 @@
 
 #include <gtest/gtest.h>
 
+#include "cppship/cmake/group.h"
 #include "cppship/core/profile.h"
+#include "cppship/exception.h"
+#include "cppship/util/cmd_runner.h"
+#include "cppship/util/fs.h"
 #include "cppship/util/io.h"
+#include "cppship/util/string.h"
 
 namespace cppship {
 
@@ -90,4 +95,112 @@ name = "p3")");
     }
 }
 
+TEST(build, get_active_package)
+{
+    const std::set<std::string_view> package_manifests = {
+        "cppship.toml",
+        "package-1/cppship.toml",
+        "dir/package-2/cppship.toml",
+        "dir/package-3/cppship.toml",
+    };
+    DirTree tree(package_manifests);
+
+    write(tree.root() / "cppship.toml", R"(
+[workspace]
+members = ["package-1", "dir/package-2", "dir/package-3"])");
+    write(tree.root() / "package-1/cppship.toml", R"(
+[package]
+version = "1.0.0"
+name = "p1")");
+    write(tree.root() / "dir/package-2/cppship.toml", R"(
+[package]
+version = "1.0.0"
+name = "p2")");
+    write(tree.root() / "dir/package-3/cppship.toml", R"(
+[package]
+version = "1.0.0"
+name = "p3")");
+
+    {
+        cmd::BuildContext ctx(Profile::debug);
+        ASSERT_FALSE(ctx.get_active_package().has_value());
+    }
+
+    {
+        ScopedCurrentDir _("package-1");
+
+        cmd::BuildContext ctx(Profile::debug);
+        ASSERT_EQ(ctx.get_active_package().value_or("???"), "p1");
+    }
+
+    {
+        ScopedCurrentDir _("dir/package-2");
+
+        cmd::BuildContext ctx(Profile::debug);
+        ASSERT_EQ(ctx.get_active_package().value_or("???"), "p2");
+    }
+
+    {
+        ScopedCurrentDir _("dir/package-3");
+
+        cmd::BuildContext ctx(Profile::debug);
+        ASSERT_EQ(ctx.get_active_package().value_or("???"), "p3");
+    }
+}
+
+TEST(build, cmake_build)
+{
+    const std::set<std::string_view> package_manifests = {
+        "cppship.toml",
+        "package-1/cppship.toml",
+        "dir/package-2/cppship.toml",
+        "dir/package-3/cppship.toml",
+    };
+    DirTree tree(package_manifests);
+
+    write(tree.root() / "cppship.toml", R"(
+[workspace]
+members = ["package-1", "dir/package-2", "dir/package-3"])");
+    write(tree.root() / "package-1/cppship.toml", R"(
+[package]
+version = "1.0.0"
+name = "p1")");
+    write(tree.root() / "dir/package-2/cppship.toml", R"(
+[package]
+version = "1.0.0"
+name = "p2")");
+    write(tree.root() / "dir/package-3/cppship.toml", R"(
+[package]
+version = "1.0.0"
+name = "p3")");
+
+    cmd::BuildContext ctx(Profile::debug);
+
+    std::string cmd;
+    util::CmdRunner runner([&](std::string_view c) {
+        cmd.assign(c);
+        return 0;
+    });
+
+    cmd::cmake_build(ctx, {}, runner);
+    ASSERT_TRUE(cmd.ends_with(fmt::format("--target {}", cmake::kCppshipGroupBinaries)));
+
+    ASSERT_THROW(cmd::cmake_build(ctx, { .package = "abc" }, runner), InvalidCmdOption);
+
+    cmd::cmake_build(ctx, { .target = "p2" }, runner);
+    ASSERT_TRUE(cmd.ends_with("--target p2"));
+
+    cmd::cmake_build(ctx, { .package = "p2" }, runner);
+    ASSERT_TRUE(cmd.ends_with(fmt::format("--target p2_{}", cmake::kCppshipGroupBinaries)));
+
+    cmd::cmake_build(ctx,
+        { .package = "p2",
+            .groups = {
+                cmd::BuildGroup::benches,
+                cmd::BuildGroup::examples,
+            }, }, runner);
+    ASSERT_TRUE(util::contains(cmd, fmt::format("--target p2_{}", cmake::kCppshipGroupBenches)));
+    ASSERT_TRUE(util::contains(cmd, fmt::format("--target p2_{}", cmake::kCppshipGroupExamples)));
+}
+
 }