Q:

What is libintl.h and where can I get it? 

Trying to do a make install of git from source, and it keep kicking up the error:
 make install
* new build flags or prefix
CC credential-store.o
In file included from credential-store.c:1:
In file included from ./cache.h:8:
./gettext.h:17:11: fatal error: 'libintl.h' file not found
#       include <libintl.h>
            ^
1 error generated. 
make: *** [credential-store.o] Error 1

No amount of Googling has turned up anything on lib.intl.h.  What is this elusive library, and how can I get it so I can finally install git? 

A:

Depending on the system, it's probably part of the GNU C library (glibc). 
Note that just installing the file libintl.h isn't likely to do you any good. 
On Debian-based systems (including Debian, Ubuntu, and Linux Mint), it's part of the libc6-dev package, installed with:
sudo apt-get install libc6-dev

Since you're using Mac OS X, a Google search for "libintl.h OSX" shows a lot of people having similar problems.  According to the INSTALL file in the Git sources:

Set NO_GETTEXT to disable localization support and make Git only use English.  Under autoconf the configure script will do this automatically if it can't find libintl on the system. 

A:

FWIW on OSX with El Capitan and homebrew, I did a:
1) I wasn't sure if the El Capitan upgrade had broken something, so first I made sure I had the latest gettext:
$ brew reinstall gettext

Then I had to re-link by doing:
$ brew unlink gettext && brew link gettext --force

After that, other tools were able to find it, and life went back to normal. 

A:

I learned libintl comes from libgettext.   If you already installed gettext by Homebrew, you would see:
$ locate libintl
/usr/local/Cellar/gettext/0.18.3.2/lib/libintl.8.dylib
/usr/local/Cellar/gettext/0.18.3.2/lib/libintl.a
/usr/local/Cellar/gettext/0.18.3.2/lib/libintl.dylib
<..snip..>

and the following works for me on the issue of "library not found for -lintl"
ln -s /usr/local/Cellar/gettext/0.18.3.2/lib/libintl.*  /usr/local/lib/

