diff --git a/android/config.go b/android/config.go
index e0b661b..9d53091 100644
--- a/android/config.go
+++ b/android/config.go
@@ -1179,6 +1179,10 @@
 	return append([]string(nil), c.productVariables.NamespacesToExport...)
 }
 
+func (c *config) SourceRootDirs() []string {
+	return c.productVariables.SourceRootDirs
+}
+
 func (c *config) IncludeTags() []string {
 	return c.productVariables.IncludeTags
 }
diff --git a/android/namespace.go b/android/namespace.go
index b43ffdf..f357ca7 100644
--- a/android/namespace.go
+++ b/android/namespace.go
@@ -225,6 +225,10 @@
 	return ns, nil
 }
 
+func (r *NameResolver) NewSkippedModule(ctx blueprint.NamespaceContext, name string, skipInfo blueprint.SkippedModuleInfo) {
+	r.rootNamespace.moduleContainer.NewSkippedModule(ctx, name, skipInfo)
+}
+
 func (r *NameResolver) AllModules() []blueprint.ModuleGroup {
 	childLists := [][]blueprint.ModuleGroup{}
 	totalCount := 0
@@ -300,7 +304,7 @@
 	for _, name := range namespace.importedNamespaceNames {
 		imp, ok := r.namespaceAt(name)
 		if !ok {
-			return fmt.Errorf("namespace %v does not exist", name)
+			return fmt.Errorf("namespace %v does not exist; Some necessary modules may have been skipped by Soong. Check if PRODUCT_SOURCE_ROOT_DIRS is pruning necessary Android.bp files.", name)
 		}
 		namespace.visibleNamespaces = append(namespace.visibleNamespaces, imp)
 	}
diff --git a/android/register.go b/android/register.go
index 9a3d3aa..1a3db9d 100644
--- a/android/register.go
+++ b/android/register.go
@@ -162,6 +162,7 @@
 	ctx := &Context{blueprint.NewContext(), config}
 	ctx.SetSrcDir(absSrcDir)
 	ctx.AddIncludeTags(config.IncludeTags()...)
+	ctx.AddSourceRootDirs(config.SourceRootDirs()...)
 	return ctx
 }
 
diff --git a/android/variable.go b/android/variable.go
index 8c5c0bc..04cc205 100644
--- a/android/variable.go
+++ b/android/variable.go
@@ -461,7 +461,8 @@
 
 	IgnorePrefer32OnDevice bool `json:",omitempty"`
 
-	IncludeTags []string `json:",omitempty"`
+	IncludeTags    []string `json:",omitempty"`
+	SourceRootDirs []string `json:",omitempty"`
 }
 
 func boolPtr(v bool) *bool {
diff --git a/cmd/soong_build/main.go b/cmd/soong_build/main.go
index 3a4d71a..8a42aa6 100644
--- a/cmd/soong_build/main.go
+++ b/cmd/soong_build/main.go
@@ -104,6 +104,7 @@
 	ctx.SetNameInterface(newNameResolver(configuration))
 	ctx.SetAllowMissingDependencies(configuration.AllowMissingDependencies())
 	ctx.AddIncludeTags(configuration.IncludeTags()...)
+	ctx.AddSourceRootDirs(configuration.SourceRootDirs()...)
 	return ctx
 }
 
diff --git a/ui/build/config.go b/ui/build/config.go
index 20cc9fb..9e02cd6 100644
--- a/ui/build/config.go
+++ b/ui/build/config.go
@@ -117,7 +117,8 @@
 
 	bazelForceEnabledModules string
 
-	includeTags []string
+	includeTags    []string
+	sourceRootDirs []string
 
 	// Data source to write ninja weight list
 	ninjaWeightListSource NinjaWeightListSource
@@ -1185,6 +1186,14 @@
 	return c.parallel
 }
 
+func (c *configImpl) GetSourceRootDirs() []string {
+	return c.sourceRootDirs
+}
+
+func (c *configImpl) SetSourceRootDirs(i []string) {
+	c.sourceRootDirs = i
+}
+
 func (c *configImpl) GetIncludeTags() []string {
 	return c.includeTags
 }
diff --git a/ui/build/dumpvars.go b/ui/build/dumpvars.go
index a9c298f..efe7478 100644
--- a/ui/build/dumpvars.go
+++ b/ui/build/dumpvars.go
@@ -148,6 +148,7 @@
 	"PLATFORM_VERSION_CODENAME",
 	"PLATFORM_VERSION",
 	"PRODUCT_INCLUDE_TAGS",
+	"PRODUCT_SOURCE_ROOT_DIRS",
 	"TARGET_PRODUCT",
 	"TARGET_BUILD_VARIANT",
 	"TARGET_BUILD_APPS",
@@ -299,4 +300,5 @@
 	config.SetBuildBrokenUsesNetwork(makeVars["BUILD_BROKEN_USES_NETWORK"] == "true")
 	config.SetBuildBrokenNinjaUsesEnvVars(strings.Fields(makeVars["BUILD_BROKEN_NINJA_USES_ENV_VARS"]))
 	config.SetIncludeTags(strings.Fields(makeVars["PRODUCT_INCLUDE_TAGS"]))
+	config.SetSourceRootDirs(strings.Fields(makeVars["PRODUCT_SOURCE_ROOT_DIRS"]))
 }
diff --git a/ui/build/soong.go b/ui/build/soong.go
index 871e637..c4c984f 100644
--- a/ui/build/soong.go
+++ b/ui/build/soong.go
@@ -410,6 +410,7 @@
 
 	blueprintCtx := blueprint.NewContext()
 	blueprintCtx.AddIncludeTags(config.GetIncludeTags()...)
+	blueprintCtx.AddSourceRootDirs(config.GetSourceRootDirs()...)
 	blueprintCtx.SetIgnoreUnknownModuleTypes(true)
 	blueprintConfig := BlueprintConfig{
 		soongOutDir: config.SoongOutDir(),