<s>
The	O
Haskell	B-Language
Cabal	B-Application
(	O
common	O
architecture	O
for	O
building	O
applications	O
and	O
libraries	O
)	O
aids	O
in	O
the	O
packaging	O
and	O
distribution	O
of	O
software	B-Application
packages	I-Application
.	O
</s>
<s>
It	O
is	O
contained	O
in	O
the	O
Haskell	B-Language
Platform	I-Language
.	O
</s>
<s>
Cabal	B-Application
has	O
been	O
introduced	O
to	O
simplify	O
packaging	O
of	O
Haskell	B-Language
software	O
and	O
modules	O
.	O
</s>
<s>
It	O
was	O
added	O
to	O
the	B-Application
Glasgow	I-Application
Haskell	I-Application
Compiler	I-Application
version	O
6.4	O
as	O
default	O
package	B-Application
manager	I-Application
,	O
along	O
GHC	O
's	O
internal	O
manager	O
ghc-pkg	O
.	O
</s>
<s>
The	O
actual	O
binary	O
cabal	B-Application
and	O
the	O
library	O
Cabal	B-Application
are	O
developed	O
in	O
different	O
packages	O
.	O
</s>
<s>
Throughout	O
its	O
development	O
it	O
has	O
gained	O
additional	O
features	O
,	O
such	O
as	O
sandboxes	O
,	O
which	O
allow	O
to	O
escape	O
the	O
so-called	O
Cabal	B-Application
hell	O
(	O
see	O
below	O
)	O
.	O
</s>
<s>
Cabal	B-Application
packages	O
provide	O
a	O
standard	O
set	O
of	O
metadata	O
and	O
build	O
process	O
;	O
thus	O
,	O
it	O
is	O
possible	O
to	O
develop	O
tools	O
to	O
upload	O
Cabal	B-Application
packages	O
to	O
the	O
CPAN-like	O
community	O
repository	O
of	O
software	O
,	O
Hackage	B-Library
,	O
or	O
even	O
allow	O
for	O
automated	O
downloading	O
,	O
compilation	O
,	O
and	O
installation	O
of	O
desired	O
packages	O
from	O
Hackage	B-Library
.	O
</s>
<s>
Cabal	B-Application
previously	O
used	O
a	O
global	O
package	O
repository	O
by	O
default	O
,	O
version	O
conflicts	O
in	O
dependencies	O
could	O
lead	O
to	O
Cabal	B-Application
hell	O
,	O
a	O
state	O
where	O
certain	O
packages	O
could	O
n't	O
get	O
installed	O
without	O
re-installing	O
already	O
existing	O
ones	O
and	O
therefore	O
breaking	O
the	O
other	O
packages	O
.	O
</s>
<s>
In	O
2014	O
,	O
a	O
more	O
stable	O
(	O
but	O
less	O
bleeding	O
edge	O
)	O
variant	O
of	O
Hackage	B-Library
called	O
Stackage	B-Application
was	O
created	O
.	O
</s>
<s>
In	O
2015	O
,	O
it	O
was	O
extended	O
with	O
Haskell	B-Language
LTS	O
and	O
the	O
tool	O
stack	B-Application
,	O
which	O
does	O
n't	O
share	O
its	O
problems	O
.	O
</s>
<s>
Cabal	B-Application
v3	O
was	O
released	O
in	O
2019	O
.	O
</s>
<s>
A	O
new	O
build	O
style	O
resolves	O
the	O
hell	O
in	O
a	O
manner	O
similar	O
to	O
the	O
Nix	B-Application
package	I-Application
manager	I-Application
.	O
</s>
