diff --git a/agb/command/build.go b/agb/command/build.go
index f77bb65..fe5e73c 100644
--- a/agb/command/build.go
+++ b/agb/command/build.go
@@ -62,9 +62,9 @@ func (bc *BuildCommand) Execute() error {
 		return err
 	}
 
-	//if err := kernel_builder.Build(); err != nil {
-	//	return err
-	//}
+	if err := kernel_builder.Build(); err != nil {
+		return err
+	}
 
 	return nil
 }
diff --git a/agb/core/gki.go b/agb/core/gki.go
index 94d7611..798331c 100644
--- a/agb/core/gki.go
+++ b/agb/core/gki.go
@@ -73,9 +73,16 @@ func (gb *GkiBuilder) Patch() error {
 
 // Prepare runs all the preparations for the build.
 func (gb *GkiBuilder) Prepare() error {
-	//if err := gb.resourceManager.GetCompiler(); err != nil {
-	//	return err
-	//}
+	// for regular GKI sources, separate Clang is not required
+	if !(gb.LinuxKernelVersion >= 5.10) {
+		if err := gb.resourceManager.GetCompiler(); err != nil {
+			return err
+		}
+	}
+
+	if err := gb.resourceManager.CleanKernelSource(); err != nil {
+		return err
+	}
 
 	if err := gb.resourceManager.GetSource(gb.AndroidVersion, gb.LinuxKernelVersion, gb.PatchVersion); err != nil {
 		return err
@@ -90,8 +97,13 @@ func (gb *GkiBuilder) Prepare() error {
 
 // Build launches GKI kernel build.
 func (gb *GkiBuilder) Build() error {
-	//cmd := "LTO=thin BUILD_CONFIG=common/build.config.gki.aarch64 build/build.sh CC=\"clang\""
-	cmd := "tools/bazel run --disk_cache=~/.cache/bazel --config=fast --config=stamp --lto=thin //common:kernel_aarch64_dist -- --dist_dir=dist"
+	var cmd string
+
+	if gb.AndroidVersion >= 14 {
+		cmd = "tools/bazel run --disk_cache=~/.cache/bazel --config=fast --config=stamp --lto=thin //common:kernel_aarch64_dist -- --dist_dir=dist"
+	} else {
+		cmd = "LTO=thin BUILD_CONFIG=common/build.config.gki.aarch64 build/build.sh CC=\"clang\""
+	}
 
 	out, err := tool.RunCmd(cmd)
 	if err != nil {
diff --git a/agb/manager/git.go b/agb/manager/git.go
index b23c132..e2fd95d 100644
--- a/agb/manager/git.go
+++ b/agb/manager/git.go
@@ -25,8 +25,8 @@ func (gm *GitManager) Clone(url string, path string, shallow bool) error {
 
 	command := fmt.Sprintf("git clone%s %s %s", depth_flag, url, path)
 
-	if _, err := tool.RunCmd(command); err != nil {
-		return cerror.ErrCommandRun{Command: command}
+	if out, err := tool.RunCmd(command); err != nil {
+		return cerror.ErrCommandRun{Command: command, Output: out}
 	}
 
 	return nil
diff --git a/agb/manager/resource.go b/agb/manager/resource.go
index 6038712..3230fb2 100644
--- a/agb/manager/resource.go
+++ b/agb/manager/resource.go
@@ -23,16 +23,12 @@ type ResourceManager struct {
 
 // NewResourceManager creates new instance of ResourceManager.
 func NewResourceManager(cu string, sloc string) *ResourceManager {
-	dc := config.NewDirectoryConfig()
-	gm := NewGitManager()
-	fm := NewFileManager()
-
 	return &ResourceManager{
 		ClangUrl:        cu,
 		SourceLocation:  sloc,
-		directoryConfig: dc,
-		gitManager:      gm,
-		fileManager:     fm,
+		directoryConfig: config.NewDirectoryConfig(),
+		gitManager:      NewGitManager(),
+		fileManager:     NewFileManager(),
 	}
 }
 
@@ -124,17 +120,23 @@ func (rm *ResourceManager) GetSource(av int, lkv float64, pv string) error {
 			}
 
 			for _, cmd := range cmds {
-				err := tool.RunCmdWDirVerbose(cmd, rm.directoryConfig.KernelSourcePath)
+				out, err := tool.RunCmdWDir(cmd, rm.directoryConfig.KernelSourcePath)
 				if err != nil {
-					return cerror.ErrCommandRun{Command: cmd, Output: ""}
+					return cerror.ErrCommandRun{Command: cmd, Output: out}
 				}
 			}
 		} else {
-			// TODO: implement custom git repository download
-			return nil
+			if err := rm.gitManager.Clone(rm.SourceLocation, rm.directoryConfig.KernelSourcePath, true); err != nil {
+				return err
+			}
 		}
 	}
 
 	tool.Mdone()
 	return nil
 }
+
+// CleanKernelSource cleans the directory with kernel sources from potential artifacts.
+func (rm *ResourceManager) CleanKernelSource() error {
+	return rm.gitManager.Reset(rm.directoryConfig.KernelSourcePath)
+}
diff --git a/agb/tool/command.go b/agb/tool/command.go
index b22be55..b4732f8 100644
--- a/agb/tool/command.go
+++ b/agb/tool/command.go
@@ -2,9 +2,8 @@ package tool
 
 import (
 	"bufio"
-	"bytes"
 	"fmt"
-	"os"
+	"io"
 	"os/exec"
 	"strings"
 	"sync"
@@ -12,57 +11,57 @@ import (
 
 // RunCmd executes a specified shell command.
 func RunCmd(command string) (string, error) {
-	var stdout bytes.Buffer
-
 	args := strings.Fields(command)
 	cmd := exec.Command(args[0], args[1:]...)
 
-	// process stdout and stderr
-	cmd.Stdout = os.Stdout
-	cmd.Stderr = os.Stderr
-	cmd.Stdout = &stdout
-	cmd.Stderr = &stdout
-
-	err := cmd.Run()
+	out, err := cmd.StdoutPipe()
+	cmd.Stderr = cmd.Stdout
+	if err != nil {
+		return "", err
+	}
 
-	return strings.TrimSpace(stdout.String()), err
-}
+	var wg sync.WaitGroup
+	wg.Add(1)
 
-// RunCmdWDir executes a specified shell command in a specified working directory.
-func RunCmdWDir(command string, path string) (string, error) {
-	var stdout bytes.Buffer
+	scanner := bufio.NewScanner(out)
+	go func() {
+		for scanner.Scan() {
+			fmt.Printf("\n%s", scanner.Text())
+		}
+		wg.Done()
+	}()
 
-	args := strings.Fields(command)
-	cmd := exec.Command(args[0], args[1:]...)
+	if err = cmd.Start(); err != nil {
+		return "", err
+	}
 
-	// process stdout and stderr
-	cmd.Stdout = os.Stdout
-	cmd.Stderr = os.Stderr
-	cmd.Stdout = &stdout
-	cmd.Stderr = &stdout
+	wg.Wait()
 
-	cmd.Dir = path
-	err := cmd.Run()
+	// convert output into string
+	fout, err := io.ReadAll(out)
+	if err != nil {
+		return "", err
+	}
 
-	return strings.TrimSpace(stdout.String()), err
+	return strings.TrimSpace(string(fout)), cmd.Wait()
 }
 
-// RunCmdWDirVerbose executes a specified shell command in a working specified directory with a verbose output.
-func RunCmdWDirVerbose(command string, path string) error {
+// RunCmdWDir executes a specified shell command in a specified working directory.
+func RunCmdWDir(command string, path string) (string, error) {
 	args := strings.Fields(command)
 	cmd := exec.Command(args[0], args[1:]...)
 	cmd.Dir = path
 
-	output, err := cmd.StdoutPipe()
+	out, err := cmd.StdoutPipe()
 	cmd.Stderr = cmd.Stdout
 	if err != nil {
-		return err
+		return "", err
 	}
 
 	var wg sync.WaitGroup
 	wg.Add(1)
 
-	scanner := bufio.NewScanner(output)
+	scanner := bufio.NewScanner(out)
 	go func() {
 		for scanner.Scan() {
 			fmt.Printf("\n%s", scanner.Text())
@@ -71,10 +70,16 @@ func RunCmdWDirVerbose(command string, path string) error {
 	}()
 
 	if err = cmd.Start(); err != nil {
-		return err
+		return "", err
 	}
 
 	wg.Wait()
 
-	return cmd.Wait()
+	// convert output into string
+	fout, err := io.ReadAll(out)
+	if err != nil {
+		return "", err
+	}
+
+	return strings.TrimSpace(string(fout)), cmd.Wait()
 }