Bayesian Dynamic Borrowing with Flexible Baseline Hazard Function R package BayesFBHborrow version 2.0.14 Allows Bayesian borrowing from a historical dataset for time-to- event data. A flexible baseline hazard function is achieved via a piecewise exponential likelihood with time varying split points and smoothing prior on the historic baseline hazards. The method is described in Scott and Lewin (2026) <doi:10.1093/biostatistics/kxag006>, and a paper focused on the software is in Scott, Axillus, Lewin and Izmirlian (2026) <doi:10.48550/arXiv.2408.04327>. Software Depends: R (>= 4.1) Imports: rlang, dplyr, invgamma, mvtnorm, checkmate, magrittr, ggplot2, patchwork, kableExtra, stats, survival, survminer, extraDistr, bayestestR Suggests: tibble, readxl, testthat (>= 3.0.0), rmarkdown, ggfortify, condSURV Grant Izmirlian <grant.izmirlian@astrazeneca.com> Comprehensive R Archive Network (CRAN) Darren Scott [aut], Sophia Axillus [aut], Grant Izmirlian [aut, cre] Apache License (>= 2) 2026-07-17 application/tgz https://CRAN.R-project.org/package=BayesFBHborrow doi:10.32614/CRAN.package.BayesFBHborrow