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diff --git a/3rdparty/lapack/dpotri.c b/3rdparty/lapack/dpotri.c
new file mode 100644
index 0000000..70e2296
--- /dev/null
+++ b/3rdparty/lapack/dpotri.c
@@ -0,0 +1,112 @@
+#include "clapack.h"
+
+/* Subroutine */ int dpotri_(char *uplo, integer *n, doublereal *a, integer *
+	lda, integer *info)
+{
+    /* System generated locals */
+    integer a_dim1, a_offset, i__1;
+
+    /* Local variables */
+    extern logical lsame_(char *, char *);
+    extern /* Subroutine */ int xerbla_(char *, integer *), dlauum_(
+	    char *, integer *, doublereal *, integer *, integer *), 
+	    dtrtri_(char *, char *, integer *, doublereal *, integer *, 
+	    integer *);
+
+
+/*  -- LAPACK routine (version 3.1) -- */
+/*     Univ. of Tennessee, Univ. of California Berkeley and NAG Ltd.. */
+/*     November 2006 */
+
+/*     .. Scalar Arguments .. */
+/*     .. */
+/*     .. Array Arguments .. */
+/*     .. */
+
+/*  Purpose */
+/*  ======= */
+
+/*  DPOTRI computes the inverse of a real symmetric positive definite */
+/*  matrix A using the Cholesky factorization A = U**T*U or A = L*L**T */
+/*  computed by DPOTRF. */
+
+/*  Arguments */
+/*  ========= */
+
+/*  UPLO    (input) CHARACTER*1 */
+/*          = 'U':  Upper triangle of A is stored; */
+/*          = 'L':  Lower triangle of A is stored. */
+
+/*  N       (input) INTEGER */
+/*          The order of the matrix A.  N >= 0. */
+
+/*  A       (input/output) DOUBLE PRECISION array, dimension (LDA,N) */
+/*          On entry, the triangular factor U or L from the Cholesky */
+/*          factorization A = U**T*U or A = L*L**T, as computed by */
+/*          DPOTRF. */
+/*          On exit, the upper or lower triangle of the (symmetric) */
+/*          inverse of A, overwriting the input factor U or L. */
+
+/*  LDA     (input) INTEGER */
+/*          The leading dimension of the array A.  LDA >= max(1,N). */
+
+/*  INFO    (output) INTEGER */
+/*          = 0:  successful exit */
+/*          < 0:  if INFO = -i, the i-th argument had an illegal value */
+/*          > 0:  if INFO = i, the (i,i) element of the factor U or L is */
+/*                zero, and the inverse could not be computed. */
+
+/*  ===================================================================== */
+
+/*     .. External Functions .. */
+/*     .. */
+/*     .. External Subroutines .. */
+/*     .. */
+/*     .. Intrinsic Functions .. */
+/*     .. */
+/*     .. Executable Statements .. */
+
+/*     Test the input parameters. */
+
+    /* Parameter adjustments */
+    a_dim1 = *lda;
+    a_offset = 1 + a_dim1;
+    a -= a_offset;
+
+    /* Function Body */
+    *info = 0;
+    if (! lsame_(uplo, "U") && ! lsame_(uplo, "L")) {
+	*info = -1;
+    } else if (*n < 0) {
+	*info = -2;
+    } else if (*lda < max(1,*n)) {
+	*info = -4;
+    }
+    if (*info != 0) {
+	i__1 = -(*info);
+	xerbla_("DPOTRI", &i__1);
+	return 0;
+    }
+
+/*     Quick return if possible */
+
+    if (*n == 0) {
+	return 0;
+    }
+
+/*     Invert the triangular Cholesky factor U or L. */
+
+    dtrtri_(uplo, "Non-unit", n, &a[a_offset], lda, info);
+    if (*info > 0) {
+	return 0;
+    }
+
+/*     Form inv(U)*inv(U)' or inv(L)'*inv(L). */
+
+    dlauum_(uplo, n, &a[a_offset], lda, info);
+
+    return 0;
+
+/*     End of DPOTRI */
+
+} /* dpotri_ */