Can't get this to compile

[Xe]

fluttershy irssi-lua (:master) X > make
cc -Wall -O2 -Werror -g  -I/usr/include/glib-2.0 -I/usr/lib/x86_64-linux-gnu/glib-2.0/include   -I/home/xena/downloads/irssi -I/home/xena/downloads/irssi/src -I/home/xena/downloads/irssi/src/fe-common/core -I/home/xena/downloads/irssi/src/core -I/home/xena/downloads/irssi/src/fe-text -I/home/xena/downloads/irssi/src/irc -I/home/xena/downloads/irssi/src/irc/core -I/home/xena/downloads/irssi/src/irc/dcc -I/home/xena/downloads/irssi/src/irc/notifylist -I. -fPIC -c lua_loader.c
In file included from lua_loader.c:21:0:
./lua_loader.h:25:17: fatal error: lua.h: No such file or directory
 #include <lua.h>
                 ^
compilation terminated.
make: *** [lua_loader.o] Error 1

Using Debian 7 and Lua 5.1