February 2026 monthly summary for ocaml/opam-repository. This period delivered notable features, fixes, and platform improvements that increase portability, stability, and business value. Key features delivered: - OR-Tools v9.15 release integrated: included the v9.15 Google OR-tools source and updated OCaml interface rewritten in C++ to avoid unnecessary copies and enable feasible solution observers. Commit: 503d53d6b1df13e6f04c519ba562256e35911a76. - OpenSUSE support additions: OS family handling and OS detection added to broaden cross-distro compatibility. Commits: 1028f206c9b314a1500e4e67aef11d1f265d6f78; f3ff8e37587a65faef0a67cfe23a1713792f6d14; 3d2d59fe47094a28a020b90abd1a60070123b374. - Dependency/packaging enhancements: conf-zlib updated to be usable as a dependency for ortools_solvers with updated depexts; new conf-bzip2 release; added test dependency on pkgconf. (Commits: dfde9a91ee57cdcd0149107fd0e23e11bf1d89a9; 6328ace62438a7c5180bda32c5d64c9d89820aa2; 43128a9f30cca21cf379759df11f50dd319bd83e.) - Windows toolchain improvements: attempted Cygwin and MSYS2 support on Windows builds; addressed missing mingw-w64-eigen3 package; added cygwin bzip2.pc to restore pkg-config support. Commits: d8ad805286d50c9e1648a210b82bfaf48b9ae225; 6ef33118d7f69428eb8003c930bd580f140adbda; 05129752edef67816511a437891384e37ac16023. - Testing/packaging clarity: added test dependencies (pkgconf), corrected opam metadata, and licensing text tweaks to improve build reproducibility and compliance. Commits: 43128a9f30cca21cf379759df11f50dd319bd83e; e6c929a139982c10ece77559a6694278df3678bd; 454c1801257f0f73ae9c119c9043e99f8cf3937b. Major bugs fixed: - CentOS-9 C++ compilation failures resolved in the build. Commit: c9925998eee4ea229efaa4238dda1ac86c62812e. - CI/build matrix improvements: s390x flagged as failing to prevent noisy CI noise and focus debugging efforts. Commit: 7ab09ac27ba422acf87d44153481c692bfcc1e2f. - Pkg-config/test/script robustness and packaging metadata corrections: fixed pkg-config test; corrected OPAM version; licensing tweaks. Commits: d145c326f351c025e677ba64c17035b8c42e2d5c; e6c929a139982c10ece77559a6694278df3678bd; 454c1801257f0f73ae9c119c9043e99f8cf3937b. - Build/environment stability: removed unnecessary mingw dependency to fix build environment; various OS/build fixes across conf-zlib/conf-bzip2, and Windows toolchains. Commits: 535f861a0906e983cbef61322ca4375cba71bfbc; 6d281cde13857fb719794267db598cee2c9830ee; 7b772... (note: see list for full references). Overall impact and accomplishments: - Significantly improved cross-platform portability and packaging resilience, enabling a broader set of users and downstreams to adopt or deploy opam-repository-based workflows. - Delivered a major feature release (OR-Tools v9.15) with architectural improvements to the OCaml interface, reducing copy overhead and enabling observers for feasible solutions. - Strengthened OS-compatibility coverage (OpenSUSE, Windows with Cygwin/MSYS2, and improved CentOS support) while refining CI signals to better track platform-specific issues. - Enhanced dependency management and testing hygiene (conf-zlib, conf-bzip2, pkgconf) enabling smoother builds and reproducible test runs. Technologies/skills demonstrated: - Cross-platform packaging and depexts (conf-zlib, conf-bzip2, OpenSUSE/OS-detection, Cygwin/MSYS2 build support). - OCaml/C++ integration and interface refactoring to support feasible solution observers in OR-Tools. - CI/CD discipline: platform-specific build fixes, test scripting reliability, and metadata/license governance. - Robust release engineering, including dependency packaging, opam packaging, and licensing alignment.

2026-01: Focused on improving cross-platform reliability and developer experience for the ocaml/opam-repository by enhancing OR-Tools installation resilience and clarifying error handling for ortools_solvers. The changes reduced installation blockers on unsupported platforms and provided clearer guidance for resolution, aiding onboarding and reducing support overhead.

December 2025 monthly summary: Delivered the initial OCaml bindings for Google OR-Tools CP-SAT as part of the ocaml/opam-repository release. The release includes two ortools packages (version 9.14.0) and establishes the OCaml integration baseline for optimization workflows, improving the ability of OCaml-based projects to model and solve CP-SAT problems. While the CP-SAT interface is currently incomplete, the groundwork enables future enhancements, reduces external tool friction, and expands business value for teams needing combinatorial optimization. This month also set release engineering and documentation foundations for ongoing improvements.

June 2025 monthly summary for LLNL/sundials focusing on documentation accuracy improvements that directly support developer throughput and reduce misconfigurations. What was delivered: - Sundials documentation corrections to align API docs with code: corrected ARKodeButcherTable_IsStifflyAccurate function signature and updated default parameters for SUNAdaptController_SetParams_ImpGus. - Commit reference: f10c03d5b0dd517c966a3466f629adcee5ec9dd8 (Docs: Minor fixes (#720)). Impact and business value: - Increased reliability of the Sundials docs, reducing onboarding time and support tickets from users trying to configure ARKode components. - Clearer API usage guidance improves downstream integration stability and developer productivity. Technologies/skills demonstrated: - Documentation accuracy and API-implementation alignment, version-control discipline, cross-team collaboration, and attention to detail in API surface.