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On FreeBSD 7.4 I ran into a compile error while compiling Lua 5.2.0 from the
source code:
[bsimonds@carbon ~/src/lua-5.2.0]$ make freebsd
gcc -O2 -Wall -DLUA_COMPAT_ALL -DLUA_USE_LINUX  -c liolib.c
liolib.c: In function 'f_seek':
liolib.c:543: error: 'off_t' undeclared (first use in this function)
liolib.c:543: error: (Each undeclared identifier is reported only once
liolib.c:543: error: for each function it appears in.)
liolib.c:543: error: expected ';' before 'offset'
liolib.c:544: error: 'offset' undeclared (first use in this function)

A quick search through the archives did not reveal to me if this bug has
been reported before or not.

I was able to easily solve this by placing an include to unistd.h in the
liolib.c file.  A short unified diff of the change follows:
--- liolib.c    2011-11-25 12:50:03.000000000 +0000
+++        2011-12-23 14:00:30.000000000 +0000
@@ -19,6 +19,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <unistd.h>

 #define liolib_c
 #define LUA_LIB

Thank you,
Bryce Simonds
Veriam Technologies, Inc.