This is very likely related to fixed bug 591286.

I almost merged it. However, the report is about a missing dependency.

2.2.29 can only be testing or newer. And nowodays, testing depends on libapr1
1.4.2.

Since 591286 was fixed on libapr1 1.4.2-4 I suggest we force Depends: libapr1
>= 1.4.2-4