# Setup¶

## Download¶

Tarballs of released versions can be downloaded from https://github.com/fredrik-johansson/arb/releases

Alternatively, you can simply install Arb from a git checkout of https://github.com/fredrik-johansson/arb/. The master branch is generally safe to use (the test suite should pass at all times), and recommended for keeping up with the latest changes.

## Dependencies¶

Arb has the following dependencies:

## Installation as part of FLINT¶

With a sufficiently new version of FLINT, Arb can be compiled as a FLINT extension package.

Simply put the Arb source directory somewhere, say /path/to/arb. Then go to the FLINT source directory and build FLINT using:

./configure --extensions=/path/to/arb <other options>
make
make check       (optional)
make install


This is convenient, as Arb does not need to be configured or linked separately. Arb becomes part of the compiled FLINT library, and the Arb header files will be installed along with the other FLINT header files.

## Standalone installation¶

To compile, test and install Arb from source as a standalone library, first install FLINT. Then go to the Arb source directory and run:

./configure <options>
make
make check       (optional)
make install


If GMP/MPIR, MPFR or FLINT is installed in some other location than the default path /usr/local, pass --with-gmp=..., --with-mpfr=... or --with-flint=... with the correct path to configure (type ./configure --help to show more options).

## Running code¶

Here is an example program to get started using Arb:

#include "arb.h"

int main()
{
arb_t x;
arb_init(x);
arb_const_pi(x, 50 * 3.33);
arb_printn(x, 50, 0); flint_printf("\n");
flint_printf("Computed with arb-%s\n", arb_version);
arb_clear(x);
}


Compile it with:

gcc -larb test.c


or (if Arb is built as part of FLINT):

gcc -lflint test.c


If the Arb/FLINT header and library files are not in a standard location (/usr/local on most systems), you may also have to pass options such as:

-I/path/to/arb -I/path/to/flint -L/path/to/flint -L/path/to/arb


to gcc. Finally, to run the program, make sure that the linker can find the FLINT (and Arb) libraries. If they are installed in a nonstandard location, you can for example add this path to the LD_LIBRARY_PATH environment variable.

The output of the example program should be something like the following:

[3.1415926535897932384626433832795028841971693993751 +/- 6.28e-50]
Computed with arb-2.4.0