# The project is in hiatus and being archived soon... [](https://travis-ci.org/picrin-scheme/picrin) [](https://picrin.readthedocs.org/) Picrin is a lightweight R7RS scheme implementation written in pure C89. It contains a reasonably fast VM, an improved hygienic macro system, useful contribution libraries, and simple but powerful C interface. - R7RS compatible - Reentrant design (all VM states are stored in single global state object) - Bytecode interpreter - Direct threaded VM - Internal representation by nan-boxing (available only on x64) - Conservative call/cc implementation (VM stack and native c stack can interleave) - Exact GC (simple mark and sweep, partially reference count) - String representation by rope - Hygienic macro transformers (syntactic closures, explicit and implicit renaming macros) - Extended library syntax ## Documentation See http://picrin.readthedocs.org/ ## Homepage Currently picrin is hosted on Github. You can freely send a bug report or pull-request, and fork the repository. https://github.com/picrin-scheme/picrin ## Build Just type `make` in the project root directory. You will find an executable binary newly created at bin/ directory. $ make When you are building picrin on x86_64 system, PIC_NAN_BOXING flag is automatically turned on (see include/picrin/config.h for detail). ## Install `make install` target is provided. By default it installs picrin binary into `/usr/local/bin/`. $ make install Since picrin does not use autoconf, if you want to specify the install directory, pass the custom path to `make` via command line argument. $ make install prefix=/path/to/dir ## Requirement To build Picrin Scheme from source code, some external libraries are required: - perl - regex.h of POSIX.1 - libedit (optional) Make command automatically turns on optional libraries if available. Picrin is mainly developed on Mac OS X and only tested on OS X or Ubuntu 14.04+. When you tried to run picrin on other platforms and found something was wrong with it, please send us an issue. ## Authors See `AUTHORS`