diff --git a/android/arch.go b/android/arch.go
index 0180b87..bb8cc02 100644
--- a/android/arch.go
+++ b/android/arch.go
@@ -391,6 +391,7 @@
 	LinuxBionic = NewOsType("linux_bionic", Host, false)
 	Windows     = NewOsType("windows", HostCross, true)
 	Android     = NewOsType("android", Device, false)
+	Fuchsia     = NewOsType("fuchsia", Device, false)
 
 	osArchTypeMap = map[OsType][]ArchType{
 		Linux:       []ArchType{X86, X86_64},
@@ -398,6 +399,7 @@
 		Darwin:      []ArchType{X86_64},
 		Windows:     []ArchType{X86, X86_64},
 		Android:     []ArchType{Arm, Arm64, Mips, Mips64, X86, X86_64},
+		Fuchsia:     []ArchType{Arm64, X86_64},
 	}
 )
 
@@ -1191,7 +1193,12 @@
 	}
 
 	if variables.DeviceArch != nil && *variables.DeviceArch != "" {
-		addTarget(Android, *variables.DeviceArch, variables.DeviceArchVariant,
+		var target = Android
+		if Bool(variables.Fuchsia) {
+			target = Fuchsia
+		}
+
+		addTarget(target, *variables.DeviceArch, variables.DeviceArchVariant,
 			variables.DeviceCpuVariant, variables.DeviceAbi)
 
 		if variables.DeviceSecondaryArch != nil && *variables.DeviceSecondaryArch != "" {
diff --git a/android/config.go b/android/config.go
index 7c1278e..09d9cbc 100644
--- a/android/config.go
+++ b/android/config.go
@@ -586,6 +586,10 @@
 	return Bool(c.productVariables.Unbundled_build) && !Bool(c.productVariables.Unbundled_build_sdks_from_source)
 }
 
+func (c *config) Fuchsia() bool {
+	return Bool(c.productVariables.Fuchsia)
+}
+
 func (c *config) IsPdkBuild() bool {
 	return Bool(c.productVariables.Pdk)
 }
diff --git a/android/module.go b/android/module.go
index 303d8c6..aed16b3 100644
--- a/android/module.go
+++ b/android/module.go
@@ -64,6 +64,7 @@
 	Host() bool
 	Device() bool
 	Darwin() bool
+	Fuchsia() bool
 	Windows() bool
 	Debug() bool
 	PrimaryArch() bool
@@ -1121,6 +1122,10 @@
 	return a.target.Os == Darwin
 }
 
+func (a *androidBaseContextImpl) Fuchsia() bool {
+	return a.target.Os == Fuchsia
+}
+
 func (a *androidBaseContextImpl) Windows() bool {
 	return a.target.Os == Windows
 }
diff --git a/android/variable.go b/android/variable.go
index ddaf166..e19d858 100644
--- a/android/variable.go
+++ b/android/variable.go
@@ -243,6 +243,8 @@
 
 	Product_is_iot *bool `json:",omitempty"`
 
+	Fuchsia *bool `json:",omitempty"`
+
 	DeviceKernelHeaders []string `json:",omitempty"`
 
 	ExtraVndkVersions []string `json:",omitempty"`
diff --git a/java/java.go b/java/java.go
index c89cb1a..2ac5a5b 100644
--- a/java/java.go
+++ b/java/java.go
@@ -998,12 +998,11 @@
 	if ctx.Device() && !ctx.Config().IsEnvFalse("TURBINE_ENABLED") {
 		if j.properties.Javac_shard_size != nil && *(j.properties.Javac_shard_size) > 0 {
 			enable_sharding = true
-			if len(j.properties.Annotation_processors) != 0 ||
-				len(j.properties.Annotation_processor_classes) != 0 {
-				ctx.PropertyErrorf("javac_shard_size",
-					"%q cannot be set when annotation processors are enabled.",
-					j.properties.Javac_shard_size)
-			}
+			// Formerly, there was a check here that prevented annotation processors
+			// from being used when sharding was enabled, as some annotation processors
+			// do not function correctly in sharded environments. It was removed to
+			// allow for the use of annotation processors that do function correctly
+			// with sharding enabled. See: b/77284273.
 		}
 		j.headerJarFile = j.compileJavaHeader(ctx, uniqueSrcFiles, srcJars, deps, flags, jarName, kotlinJars)
 		if ctx.Failed() {
diff --git a/ui/build/paths/config.go b/ui/build/paths/config.go
index e8e92e6..1d8684b 100644
--- a/ui/build/paths/config.go
+++ b/ui/build/paths/config.go
@@ -97,7 +97,6 @@
 	"lsof":      Allowed,
 	"m4":        Allowed,
 	"md5sum":    Allowed,
-	"mv":        Allowed,
 	"openssl":   Allowed,
 	"patch":     Allowed,
 	"pgrep":     Allowed,
@@ -157,6 +156,7 @@
 	"ls":       Toybox,
 	"mkdir":    Toybox,
 	"mktemp":   Toybox,
+	"mv":       Toybox,
 	"od":       Toybox,
 	"paste":    Toybox,
 	"pwd":      Toybox,
diff --git a/ui/build/sandbox_linux.go b/ui/build/sandbox_linux.go
index f77eebb..85c4a9a 100644
--- a/ui/build/sandbox_linux.go
+++ b/ui/build/sandbox_linux.go
@@ -127,6 +127,9 @@
 		// in soong_ui
 		"-e",
 
+		// Mount /proc read-write, necessary to run a nested nsjail or minijail0
+		"--proc_rw",
+
 		// Use a consistent user & group.
 		// Note that these are mapped back to the real UID/GID when
 		// doing filesystem operations, so they're rather arbitrary.