diff --git a/scripts/build-ndk-prebuilts.sh b/scripts/build-ndk-prebuilts.sh
index 65a2329ba..2a1c7df55 100755
--- a/scripts/build-ndk-prebuilts.sh
+++ b/scripts/build-ndk-prebuilts.sh
@@ -9,6 +9,12 @@ TOP=$(pwd)
 
 source build/envsetup.sh
 PLATFORM_SDK_VERSION=$(get_build_var PLATFORM_SDK_VERSION)
+PLATFORM_VERSION_ALL_CODENAMES=$(get_build_var PLATFORM_VERSION_ALL_CODENAMES)
+
+# PLATFORM_VERSION_ALL_CODESNAMES is a comma separated list like O,P. We need to
+# turn this into ["O","P"].
+PLATFORM_VERSION_ALL_CODENAMES=${PLATFORM_VERSION_ALL_CODENAMES/,/","}
+PLATFORM_VERSION_ALL_CODENAMES="[\"${PLATFORM_VERSION_ALL_CODENAMES}\"]"
 
 SOONG_OUT=${OUT_DIR}/soong
 SOONG_NDK_OUT=${OUT_DIR}/soong/ndk
@@ -16,8 +22,36 @@ rm -rf ${SOONG_OUT}
 mkdir -p ${SOONG_OUT}
 cat > ${SOONG_OUT}/soong.config << EOF
 {
-    "Ndk_abis": true,
-    "Platform_sdk_version": ${PLATFORM_SDK_VERSION}
+    "Ndk_abis": true
+}
+EOF
+
+# We only really need to set some of these variables, but soong won't merge this
+# with the defaults, so we need to write out all the defaults with our values
+# added.
+cat > ${SOONG_OUT}/soong.variables << EOF
+{
+    "Platform_sdk_version": ${PLATFORM_SDK_VERSION},
+    "Platform_version_active_codenames": ${PLATFORM_VERSION_ALL_CODENAMES},
+
+    "DeviceName": "flounder",
+    "DeviceArch": "arm64",
+    "DeviceArchVariant": "armv8-a",
+    "DeviceCpuVariant": "denver64",
+    "DeviceAbi": [
+        "arm64-v8a"
+    ],
+    "DeviceUsesClang": true,
+    "DeviceSecondaryArch": "arm",
+    "DeviceSecondaryArchVariant": "armv7-a-neon",
+    "DeviceSecondaryCpuVariant": "denver",
+    "DeviceSecondaryAbi": [
+        "armeabi-v7a"
+    ],
+    "HostArch": "x86_64",
+    "HostSecondaryArch": "x86",
+    "Malloc_not_svelte": false,
+    "Safestack": false
 }
 EOF
 BUILDDIR=${SOONG_OUT} ./bootstrap.bash