diff --git a/java/app_builder.go b/java/app_builder.go
index 348c8b4..ec2f6da 100644
--- a/java/app_builder.go
+++ b/java/app_builder.go
@@ -31,31 +31,13 @@
 var (
 	Signapk = pctx.AndroidStaticRule("signapk",
 		blueprint.RuleParams{
-			Command: `${config.JavaCmd} ${config.JavaVmFlags} -Djava.library.path=$$(dirname $signapkJniLibrary) ` +
-				`-jar $signapkCmd $flags $certificates $in $out`,
-			CommandDeps: []string{"$signapkCmd", "$signapkJniLibrary"},
+			Command: `${config.JavaCmd} ${config.JavaVmFlags} -Djava.library.path=$$(dirname ${config.SignapkJniLibrary}) ` +
+				`-jar ${config.SignapkCmd} $flags $certificates $in $out`,
+			CommandDeps: []string{"${config.SignapkCmd}", "${config.SignapkJniLibrary}"},
 		},
 		"flags", "certificates")
-
-	androidManifestMerger = pctx.AndroidStaticRule("androidManifestMerger",
-		blueprint.RuleParams{
-			Command: "java -classpath $androidManifestMergerCmd com.android.manifmerger.Main merge " +
-				"--main $in --libs $libsManifests --out $out",
-			CommandDeps: []string{"$androidManifestMergerCmd"},
-			Description: "merge manifest files",
-		},
-		"libsManifests")
 )
 
-func init() {
-	pctx.SourcePathVariable("androidManifestMergerCmd", "prebuilts/devtools/tools/lib/manifest-merger.jar")
-	pctx.HostBinToolVariable("aaptCmd", "aapt")
-	pctx.HostJavaToolVariable("signapkCmd", "signapk.jar")
-	// TODO(ccross): this should come from the signapk dependencies, but we don't have any way
-	// to express host JNI dependencies yet.
-	pctx.HostJNIToolVariable("signapkJniLibrary", "libconscrypt_openjdk_jni")
-}
-
 var combineApk = pctx.AndroidStaticRule("combineApk",
 	blueprint.RuleParams{
 		Command:     `${config.MergeZipsCmd} $out $in`,
diff --git a/java/config/config.go b/java/config/config.go
index cb13744..f7b79a5 100644
--- a/java/config/config.go
+++ b/java/config/config.go
@@ -139,27 +139,66 @@
 
 	pctx.HostJavaToolVariable("JacocoCLIJar", "jacoco-cli.jar")
 
-	hostBinToolVariableWithPrebuilt := func(name, prebuiltDir, tool string) {
-		pctx.VariableFunc(name, func(ctx android.PackageVarContext) string {
-			if ctx.Config().UnbundledBuild() || ctx.Config().IsPdkBuild() {
-				return filepath.Join(prebuiltDir, runtime.GOOS, "bin", tool)
-			} else {
-				return pctx.HostBinToolPath(ctx, tool).String()
-			}
-		})
-	}
-
-	hostBinToolVariableWithPrebuilt("Aapt2Cmd", "prebuilts/sdk/tools", "aapt2")
-
 	pctx.HostBinToolVariable("ManifestCheckCmd", "manifest_check")
 	pctx.HostBinToolVariable("ManifestFixerCmd", "manifest_fixer")
 
 	pctx.HostBinToolVariable("ManifestMergerCmd", "manifest-merger")
 
-	pctx.HostBinToolVariable("ZipAlign", "zipalign")
-
 	pctx.HostBinToolVariable("Class2Greylist", "class2greylist")
 	pctx.HostBinToolVariable("HiddenAPI", "hiddenapi")
+
+	hostBinToolVariableWithSdkToolsPrebuilt("Aapt2Cmd", "aapt2")
+	hostBinToolVariableWithBuildToolsPrebuilt("AidlCmd", "aidl")
+	hostBinToolVariableWithBuildToolsPrebuilt("ZipAlign", "zipalign")
+
+	hostJavaToolVariableWithSdkToolsPrebuilt("SignapkCmd", "signapk")
+	// TODO(ccross): this should come from the signapk dependencies, but we don't have any way
+	// to express host JNI dependencies yet.
+	hostJNIToolVariableWithSdkToolsPrebuilt("SignapkJniLibrary", "libconscrypt_openjdk_jni")
+}
+
+func hostBinToolVariableWithSdkToolsPrebuilt(name, tool string) {
+	pctx.VariableFunc(name, func(ctx android.PackageVarContext) string {
+		if ctx.Config().UnbundledBuild() || ctx.Config().IsPdkBuild() {
+			return filepath.Join("prebuilts/sdk/tools", runtime.GOOS, "bin", tool)
+		} else {
+			return pctx.HostBinToolPath(ctx, tool).String()
+		}
+	})
+}
+
+func hostJavaToolVariableWithSdkToolsPrebuilt(name, tool string) {
+	pctx.VariableFunc(name, func(ctx android.PackageVarContext) string {
+		if ctx.Config().UnbundledBuild() || ctx.Config().IsPdkBuild() {
+			return filepath.Join("prebuilts/sdk/tools/lib", tool+".jar")
+		} else {
+			return pctx.HostJavaToolPath(ctx, tool+".jar").String()
+		}
+	})
+}
+
+func hostJNIToolVariableWithSdkToolsPrebuilt(name, tool string) {
+	pctx.VariableFunc(name, func(ctx android.PackageVarContext) string {
+		if ctx.Config().UnbundledBuild() || ctx.Config().IsPdkBuild() {
+			ext := ".so"
+			if runtime.GOOS == "darwin" {
+				ext = ".dylib"
+			}
+			return filepath.Join("prebuilts/sdk/tools", runtime.GOOS, "lib64", tool+ext)
+		} else {
+			return pctx.HostJNIToolPath(ctx, tool).String()
+		}
+	})
+}
+
+func hostBinToolVariableWithBuildToolsPrebuilt(name, tool string) {
+	pctx.VariableFunc(name, func(ctx android.PackageVarContext) string {
+		if ctx.Config().UnbundledBuild() || ctx.Config().IsPdkBuild() {
+			return filepath.Join("prebuilts/build-tools", ctx.Config().PrebuiltOS(), "bin", tool)
+		} else {
+			return pctx.HostBinToolPath(ctx, tool).String()
+		}
+	})
 }
 
 // JavaCmd returns a SourcePath object with the path to the java command.
diff --git a/java/config/makevars.go b/java/config/makevars.go
index ead298a..c40f4fc 100644
--- a/java/config/makevars.go
+++ b/java/config/makevars.go
@@ -82,4 +82,17 @@
 	ctx.Strict("HIDDENAPI", "${HiddenAPI}")
 
 	ctx.Strict("DEX_FLAGS", "${DexFlags}")
+
+	ctx.Strict("AIDL", "${AidlCmd}")
+	ctx.Strict("AAPT2", "${Aapt2Cmd}")
+	ctx.Strict("ZIPALIGN", "${ZipAlign}")
+	ctx.Strict("SIGNAPK_JAR", "${SignapkCmd}")
+	ctx.Strict("SIGNAPK_JNI_LIBRARY_PATH", "${SignapkJniLibrary}")
+
+	ctx.Strict("SOONG_ZIP", "${SoongZipCmd}")
+	ctx.Strict("MERGE_ZIPS", "${MergeZipsCmd}")
+	ctx.Strict("ZIP2ZIP", "${Zip2ZipCmd}")
+
+	ctx.Strict("ZIPTIME", "${Ziptime}")
+
 }
diff --git a/java/gen.go b/java/gen.go
index 69965ec..a073ca2 100644
--- a/java/gen.go
+++ b/java/gen.go
@@ -23,7 +23,6 @@
 )
 
 func init() {
-	pctx.HostBinToolVariable("aidlCmd", "aidl")
 	pctx.HostBinToolVariable("syspropCmd", "sysprop_java")
 	pctx.SourcePathVariable("logtagsCmd", "build/make/tools/java-event-log-tags.py")
 	pctx.SourcePathVariable("mergeLogtagsCmd", "build/make/tools/merge-event-log-tags.py")
@@ -33,8 +32,8 @@
 var (
 	aidl = pctx.AndroidStaticRule("aidl",
 		blueprint.RuleParams{
-			Command:     "$aidlCmd -d$depFile $aidlFlags $in $out",
-			CommandDeps: []string{"$aidlCmd"},
+			Command:     "${config.AidlCmd} -d$depFile $aidlFlags $in $out",
+			CommandDeps: []string{"${config.AidlCmd}"},
 		},
 		"depFile", "aidlFlags")