liblbfgsb-dev binary package in Ubuntu Lunar riscv64

 Fortran library implementing limited-memory quasi-Newton
 bound-constrained optimization as described in [1,2,3].
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 This package contains the static library.
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 [1] R. H. Byrd, P. Lu and J. Nocedal. A Limited Memory Algorithm for
 Bound Constrained Optimization, (1995), SIAM Journal on Scientific
 and Statistical Computing , 16, 5, pp. 1190-1208.
 .
 [2] C. Zhu, R. H. Byrd and J. Nocedal. L-BFGS-B: Algorithm 778:
 L-BFGS-B, FORTRAN routines for large scale bound constrained
 optimization (1997), ACM Transactions on Mathematical Software, Vol
 23, Num. 4, pp. 550 - 560.
 .
 [3] J.L. Morales and J. Nocedal. L-BFGS-B: Remark on Algorithm 778:
 L-BFGS-B, FORTRAN routines for large scale bound constrained
 optimization (2011), to appear in ACM Transactions on Mathematical
 Software.

Source package