libo is a library for managing OSC bundles and the odot-expression language, by [https://github.com/maccallum](John MacCallum).

libo can be built on Mac OS X, Windows 10 (MinGW + MSYS2), and many flavors of Linux, including Raspberry Pi OS. The result is a static library, libo.a, that can be linked to by other programs, such as the odot objects for Max and PD.

• libo requires recent versions of http://flex.sourceforge.net and http://www.gnu.org/software/bison/. These can be installed using your system's package manager or from source.

Note for OS X: the OS X Developer's Tools install an old version of Flex and Bison that will not work---newer versions can be installed using https://brew.sh or from source.

By default, only a static library is built. If you want a dynamic library, set the variable DYNAMIC to true. Similarly, you can suppress the build of the static library by setting STATIC to false. E.g.

$ DYNAMIC=true STATIC=false make

$ cd <path/to/libo>
$ make

Note: if building for Catalina or earlier versions of Mac OS X, set NOM1 to true:

$ NOM1=true make

The Windows 10 build is done using MinGW under MSYS2. Make sure you have installed the 64-bit GCC toolchain (pacman -S mingw-w64-x86_64-toolchain), and Flex (pacman -S flex) and Bison (pacman -S bison).

$ cd <path/to/libo>
$ make win64

Note that 32-bit builds on Windows are not supported.

The Makefile is set up to use clang. GCC should also work, with the appropriate changes to the Makefile.

$ cd <path/to/libo>
$ make linux

• If a linker error is produced stating that libfl.a could not be found, it was probably installed somewhere other than /usr/local/lib. You can either move or symlink it into /usr/local/lib, or pass its location when you call make, for example: make FLEX_LIB_FOLDER=/usr/local/opt/flex/lib