<s>
GNU	B-Application
Prolog	I-Application
(	O
also	O
called	O
gprolog	B-Application
)	O
is	O
a	O
compiler	B-Language
developed	O
by	O
Daniel	O
Diaz	O
with	O
an	O
interactive	O
debugging	B-Application
environment	O
for	O
Prolog	B-Language
available	O
for	O
Unix	B-Application
,	O
Windows	B-Application
,	O
Mac	B-Operating_System
OS	I-Operating_System
X	I-Operating_System
and	O
Linux	B-Application
.	O
</s>
<s>
It	O
also	O
supports	O
some	O
extensions	O
to	O
Prolog	B-Language
including	O
constraint	B-Application
programming	I-Application
over	O
a	O
finite	O
domain	O
,	O
parsing	O
using	O
definite	B-Application
clause	I-Application
grammars	I-Application
,	O
and	O
an	O
operating	B-General_Concept
system	I-General_Concept
interface	O
.	O
</s>
<s>
The	O
compiler	B-Language
converts	O
the	O
source	O
code	O
into	O
byte	O
code	O
that	O
can	O
be	O
interpreted	O
by	O
a	O
Warren	B-Application
abstract	I-Application
machine	I-Application
(	O
WAM	O
)	O
and	O
converts	O
that	O
to	O
standalone	O
executables	B-Application
.	O
</s>
