diff --git a/packages/libllvm/build.sh b/packages/libllvm/build.sh
index 3b67b7dcdddefd..b641866f365464 100644
--- a/packages/libllvm/build.sh
+++ b/packages/libllvm/build.sh
@@ -28,6 +28,13 @@ LLVM_PROJECTS="clang;clang-tools-extra;compiler-rt;lld;mlir;openmp;polly"
 if [ $TERMUX_ARCH = "aarch64" ] || [ $TERMUX_ARCH = "x86_64" ]; then
 	LLVM_PROJECTS+=";lldb"
 fi
+
+if [ "$TERMUX__PREFIX" = "$TERMUX__ROOTFS" ]; then
+	DEFAULT_SYSROOT=".."
+else
+	DEFAULT_SYSROOT="../.."
+fi
+
 # See http://llvm.org/docs/CMake.html:
 TERMUX_PKG_EXTRA_CONFIGURE_ARGS="
 -DANDROID_PLATFORM_LEVEL=$TERMUX_PKG_API_LEVEL
@@ -41,7 +48,7 @@ TERMUX_PKG_EXTRA_CONFIGURE_ARGS="
 -DCLANG_INCLUDE_TESTS=OFF
 -DCLANG_TOOL_C_INDEX_TEST_BUILD=OFF
 -DCOMPILER_RT_USE_BUILTINS_LIBRARY=ON
--DDEFAULT_SYSROOT=$(dirname $TERMUX_PREFIX/)
+-DDEFAULT_SYSROOT=$DEFAULT_SYSROOT
 -DLLVM_LINK_LLVM_DYLIB=ON
 -DLLDB_ENABLE_PYTHON=ON
 -DLLDB_PYTHON_RELATIVE_PATH=lib/python${TERMUX_PYTHON_VERSION}/site-packages