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diff --git a/circuitpython/extmod/ulab/code/numpy/linalg/linalg_tools.h b/circuitpython/extmod/ulab/code/numpy/linalg/linalg_tools.h
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+++ b/circuitpython/extmod/ulab/code/numpy/linalg/linalg_tools.h
@@ -0,0 +1,28 @@
+/*
+ * This file is part of the micropython-ulab project,
+ *
+ * https://github.com/v923z/micropython-ulab
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2019-2021 Zoltán Vörös
+*/
+
+#ifndef _TOOLS_TOOLS_
+#define _TOOLS_TOOLS_
+
+#ifndef LINALG_EPSILON
+#if MICROPY_FLOAT_IMPL == MICROPY_FLOAT_IMPL_FLOAT
+#define LINALG_EPSILON MICROPY_FLOAT_CONST(1.2e-7)
+#elif MICROPY_FLOAT_IMPL == MICROPY_FLOAT_IMPL_DOUBLE
+#define LINALG_EPSILON MICROPY_FLOAT_CONST(2.3e-16)
+#endif
+#endif /* LINALG_EPSILON */
+
+#define JACOBI_MAX 20
+
+bool linalg_invert_matrix(mp_float_t *, size_t );
+size_t linalg_jacobi_rotations(mp_float_t *, mp_float_t *, size_t );
+
+#endif /* _TOOLS_TOOLS_ */
+