HTK on OS X

On OS X, HTK has its own dependencies which you'll need to install. The process, in four parts are:

1. Command Line Tools
2. X11
3. Downloading and fixing HTK
4. Installing HTK

Command line Tools

It is necessary to install a C compiler to install HTK. If you are not sure whether you have a C compiler installed, open the Terminal application and type

gcc -v

If you see -bash: gcc: command not found, then you need to install the C compiler.

OS X Mavericks (10.9)

In OS X Mavericks (10.9), installation of command line tools has been greatly simplified. If you are running Mavericks, just open the Terminal application and type

xcode-select --install

Just select "Install" in the window which pops open.

OS X Lion and Mountain Lion (10.7 & 10.8)

You need to install command line tools and X11. The here are the steps involved:

1. Go to the Mac Dev Center, register (for free) and log in.
2. Go to Downloads, and and then View All Downloads.
3. Search for "command line tools."
4. Download and install the version appropriate for your operating system.

A graphical representation:

1. Register and login

2. Downloads

2. View All Downloads

3 & 4. Search for "command line tools" and download

X11

Go to http://xquartz.macosforge.org/, download XQuartz from there and install it using the installer.

Downloading and Fixing HTK

Download HTK

You'll need to register (free) with HTK to download it. Visit http://htk.eng.cam.ac.uk/register.shtmlto register, and they will e-mail you a password.

After that, visit http://htk.eng.cam.ac.uk/download.shtml, and download the HTK source code under Linux/Unix downloads.

After downloading HTK, unpack the .tar.gz file, which will unpack into a directory called "htk".

Fixing HTK Source

In the htk directory, navigate to htk>HTKLib, and open the file HRec.c in a plain text editor.

Find the line 1650 which reads

if (dur<=0 && labid != splabid) HError(8522,"LatFromPaths: Align have dur<=0 ");

Note, this is the second instance of this if statement. You can tell that you're changing the right line because this one has a space between 0 and the final quote, while the wrong line has two spaces between Align and have. labid in this line should be changed to labpr. It should look like this:

if (dur<=0 && labpr != splabid) HError(8522,"LatFromPaths: Align have dur<=0 ");

Installing HTK

Nearly there! Now, open the Terminal application, and navigate to the htk, folder, which is probably in your Downloads.

cd ~/Downloads/htk

Now run the following lines of code

export CPPFLAGS=-I/opt/X11/include./configuremake allsudo make install

You'll be asked to enter your administrative password after that last line of code.