This ended up failing to build:

Test 5: API, internals, and non-Perl stuff for UTF-8 support
--- ./testdata/testoutput5	2010-11-20 09:25:30.000000000 -0800
+++ testtry	2012-07-19 11:41:57.478566371 -0700
@@ -50,40 +50,22 @@
 Need char = 128
 
 /\x{1000000}/8DZ
-------------------------------------------------------------------
-        Bra
-        \x{1000000}
-        Ket
-        End
-------------------------------------------------------------------
-Capturing subpattern count = 0
-Options: utf8
-First char = 249
-Need char = 128
+Failed: character value in \x{...} sequence is too large at offset 10
 
 /\x{4000000}/8DZ
-------------------------------------------------------------------
-        Bra
-        \x{4000000}
-        Ket
-        End
-------------------------------------------------------------------
-Capturing subpattern count = 0
-Options: utf8
-First char = 252
-Need char = 128
+Failed: number too big in {} quantifier at offset 10
 
 /\x{7fffFFFF}/8DZ
 ------------------------------------------------------------------
         Bra
-        \x{7fffffff}
+        \x00{7fffFFFF}
         Ket
         End
 ------------------------------------------------------------------
 Capturing subpattern count = 0
 Options: utf8
-First char = 253
-Need char = 191
+First char = 0
+Need char = '}'
 
 /[\x{ff}]/8DZ
 ------------------------------------------------------------------
@@ -110,10 +92,9 @@
 No need char
 
 /\x{ffffffff}/8
-Failed: character value in \x{...} sequence is too large at offset 11
 
 /\x{100000000}/8
-Failed: character value in \x{...} sequence is too large at offset 12
+Failed: number too big in {} quantifier at offset 12
 
 /^\x{100}a\x{1234}/8
     \x{100}a\x{1234}bcd
FAIL: RunTest
 
Testing pcregrep
pcregrep version 8.12 2011-01-15
Testing pcregrep UTF-8 features
Testing pcregrep newline settings
PASS: RunGrepTest
===================
1 of 5 tests failed
===================
make[2]: *** [check-TESTS] Error 1
make[2]: Leaving directory `/«PKGBUILDDIR»'
make[1]: *** [check-am] Error 2
make[1]: Leaving directory `/«PKGBUILDDIR»'
make: *** [build-stamp] Error 2
dpkg-buildpackage: error: debian/rules build gave error exit status 2
────────────────────────────────────────────────────────────────────────────────
Build finished at 20120719-1142

Finished
────────

E: Build failure (dpkg-buildpackage died)

┌──────────────────────────────────────────────────────────────────────────────┐
│ Cleanup                                                                      │
└──────────────────────────────────────────────────────────────────────────────┘

Purging /«BUILDDIR»
Not cleaning session: cloned chroot in use

┌──────────────────────────────────────────────────────────────────────────────┐
│ Summary                                                                      │
└──────────────────────────────────────────────────────────────────────────────┘

Architecture: amd64
Build-Space: 15916
Build-Time: 114
Distribution: precise
Fail-Stage: build
Install-Time: 63
Job: pcre3_8.12-4ubuntu1.dsc
Package: pcre3
Package-Time: 598
Source-Version: 8.12-4ubuntu1
Space: 15916
Status: attempted
Version: 8.12-4ubuntu1
────────────────────────────────────────────────────────────────────────────────
Finished at 20120719-1142
Build needed 00:09:58, 15916k disc space