diff --git a/build.config.cuttlefish.aarch64 b/build.config.cuttlefish.aarch64
new file mode 100644
index 000000000000..9450cead4b8e
--- /dev/null
+++ b/build.config.cuttlefish.aarch64
@@ -0,0 +1,10 @@
+. ${ROOT_DIR}/common/build.config.common
+. ${ROOT_DIR}/common/build.config.aarch64
+. ${ROOT_DIR}/common/build.config.gki
+
+DEFCONFIG=cf_aarch_64_gki_defconfig
+PRE_DEFCONFIG_CMDS="cat ./common/arch/arm64/configs/gki_defconfig ./common/cuttlefish.fragment > ./common/arch/arm64/configs/${DEFCONFIG};"
+POST_DEFCONFIG_CMDS="rm ./common/arch/arm64/configs/${DEFCONFIG}"
+
+# Not saving any kernel images. This build step is meant purely to generate the .kos.
+FILES=""
diff --git a/build.config.cuttlefish.x86_64 b/build.config.cuttlefish.x86_64
new file mode 100644
index 000000000000..0778c5762b16
--- /dev/null
+++ b/build.config.cuttlefish.x86_64
@@ -0,0 +1,10 @@
+. ${ROOT_DIR}/common/build.config.common
+. ${ROOT_DIR}/common/build.config.x86_64
+. ${ROOT_DIR}/common/build.config.gki
+
+DEFCONFIG=cf_x86_64_gki_defconfig
+PRE_DEFCONFIG_CMDS="cat ./common/arch/x86/configs/gki_defconfig ./common/cuttlefish.fragment > ./common/arch/x86/configs/${DEFCONFIG};"
+POST_DEFCONFIG_CMDS="rm ./common/arch/x86/configs/${DEFCONFIG}"
+
+# Not saving any kernel images. This build step is meant purely to generate the .kos.
+FILES=""
diff --git a/cuttlefish.fragment b/cuttlefish.fragment
new file mode 100644
index 000000000000..1e49da8de975
--- /dev/null
+++ b/cuttlefish.fragment
@@ -0,0 +1,20 @@
+CONFIG_CPUFREQ_DUMMY=m
+CONFIG_BINFMT_MISC=m
+CONFIG_VSOCKETS=m
+CONFIG_VIRTIO_VSOCKETS=m
+CONFIG_CAN=m
+CONFIG_CAN_VCAN=m
+CONFIG_GNSS_CMDLINE_SERIAL=m
+CONFIG_VIRTIO_BLK=m
+CONFIG_VIRTIO_NET=m
+CONFIG_VIRT_WIFI=m
+CONFIG_SERIAL_OF_PLATFORM=m
+CONFIG_VIRTIO_CONSOLE=m
+CONFIG_HW_RANDOM_VIRTIO=m
+CONFIG_DRM_VIRTIO_GPU=m
+CONFIG_SND_INTEL8X0=m
+CONFIG_USB_DUMMY_HCD=m
+CONFIG_RTC_DRV_TEST=m
+CONFIG_VIRTIO_PCI=m
+CONFIG_VIRTIO_INPUT=m
+CONFIG_VIRTIO_MMIO=m