<s>
Gnulib	B-Application
,	O
also	O
called	O
the	O
GNU	B-Application
portability	I-Application
library	I-Application
,	O
is	O
a	O
collection	O
of	O
software	O
subroutines	O
which	O
are	O
designed	O
to	O
be	O
usable	O
on	O
many	O
operating	B-General_Concept
systems	I-General_Concept
.	O
</s>
<s>
The	O
goal	O
of	O
the	O
project	O
is	O
to	O
make	O
it	O
easy	O
for	O
free	B-Application
software	I-Application
authors	O
to	O
make	O
their	O
software	O
run	O
on	O
many	O
operating	B-General_Concept
systems	I-General_Concept
.	O
</s>
<s>
Since	O
source	O
is	O
designed	O
to	O
be	O
copied	O
from	O
gnulib	B-Application
,	O
it	O
is	O
not	O
a	O
library	O
per-se	O
,	O
as	O
much	O
as	O
a	O
collection	O
of	O
portable	O
idioms	O
to	O
be	O
used	O
in	O
other	O
projects	O
.	O
</s>
<s>
Thus	O
,	O
Gnulib	B-Application
is	O
the	B-Application
GNU	I-Application
project	I-Application
's	O
portability	B-Architecture
library	O
.	O
</s>
<s>
It	O
is	O
primarily	O
written	O
for	O
use	O
by	O
the	B-Application
GNU	I-Application
Project	I-Application
,	O
but	O
can	O
be	O
used	O
by	O
any	O
free	B-Application
software	I-Application
project	O
.	O
</s>
