- Subversion (svn): this is needed to download Kaldi and other software that it depends on.
- wget is required for the installation of some non-Kaldi components described below
- doxygen: this is the program we use to generate html documentation from the C++ source (which has been marked up according to doxygen requirements). If you will be changing the source significantly, this might be useful.
- The example scripts require standard UNIX utilities such as bash, perl, awk, grep, and make (cygwin can supply these on Windows). The toolkit itself does not require or directly interact with any of these, and given appropriate scripts would work in any type of shell.
- The following tools and libraries come with installation instructions in the tools/ directory:
- OpenFst: we compile against this so this is needed.
- IRSTLM: this a language modeling toolkit. Some of the example scripts require it but it is not tightly integrated with Kaldi; we can convert any Arpa format language model to an FST.
- The IRSTLM build process requires automake, aclocal, and libtoolize (the corresponding packages are automake and libtool).
- sph2pipe: this is for converting sph format files into other formats such as wav. It's needed for the example scripts that use LDC data.
- sclite: this is for scoring and is not necessary as we have our own, simple scoring program (compute-wer.cc).
- dot: this is required by doxygen, to compile html documentation from the C++ source (if you want to do this yourself). It is also used to interpret the output of fstdraw which can sometimes be useful when debugging FSTs.
- ATLAS, the linear algebra library. This is only needed for the headers; in typical setups we expect that ATLAS will be on your system. However, if it not already on your system you can compile ATLAS as long as your machine does not have CPU throttling enabled.
- CLAPACK, the linear algebra library (we download the headers). This is useful only on systems where you don't have ATLAS and are instead compiling with CLAPACK.
1.7.3 
