Reported by Michael Raskin, Nov 10, 2010

Steps to reproduce the problem:
-------------------------------

1. Build fresh Botan (as of now, 1.9.10; probably, 1.9.0+)
2. Try building Monotone against it.

Expected result:
----------------
Succesful compilation. 

Actual results:
---------------
g++  -I. \
-I/nix/store/m9rcq75427hqbxpk1lya8qarpgnv9f8c-pcre-7.8/include \
-I/nix/store/3z4djcwsqisdhiwdjxi06prkqvhdhaxf-botan-1.9.10/include \
-I/nix/store/6rvb494zgdj7cvq7bm43kp884hz68rkc-lua-5.1.4/include \
-I/nix/store/46icwk6d4w4dyysfv3phn1s3ddrl8b7v-sqlite-3.7.2/include \
-I/nix/store/ggm90i12bafzbdcp6gjahdxvlim6jkdq-libidn-1.19/include \
-g -O2 -Wall -W -Wno-unused -c -o transforms.o transforms.cc
transforms.cc: In function 'std::string xform(const 
std::string&, origin::type) [with XFM = 
Botan::Gzip_Compression]':
transforms.cc:198: error: cannot allocate an object of abstract type 
'Botan::Gzip_Compression'
gzip.hh:37: note:   because the following virtual functions are pure 
within 'Botan::Gzip_Compression':
/nix/store/3z4djcwsqisdhiwdjxi06prkqvhdhaxf-botan-1.9.10/include/bota
n/filter.h:25: note:       virtual std::string Botan::Filter::name() 
const
transforms.cc:198: error: cannot allocate an object of abstract type 
'Botan::Gzip_Compression'
gzip.hh:37: note:   since type 'Botan::Gzip_Compression' has pure 
virtual functions
transforms.cc: In function 'std::string xform(const 
std::string&, origin::type) [with XFM = 
Botan::Gzip_Decompression]':
transforms.cc:199: error: cannot allocate an object of abstract type 
'Botan::Gzip_Decompression'
gzip.hh:60: note:   because the following virtual functions are pure 
within 'Botan::Gzip_Decompression':
/nix/store/3z4djcwsqisdhiwdjxi06prkqvhdhaxf-botan-1.9.10/include/bota
n/filter.h:25: note:       virtual std::string Botan::Filter::name() 
const
transforms.cc:199: error: cannot allocate an object of abstract type 
'Botan::Gzip_Decompression'
gzip.hh:60: note:   since type 'Botan::Gzip_Decompression' has pure 
virtual functions
transforms.cc: In function 'void pack(const T&, 
base64<gzip<INNER> >&)':
transforms.cc:214: error: cannot allocate an object of abstract type 
'Botan::Gzip_Compression'
gzip.hh:37: note:   since type 'Botan::Gzip_Compression' has pure 
virtual functions
transforms.cc:224: error: cannot allocate an object of abstract type 
'Botan::Gzip_Compression'
gzip.hh:37: note:   since type 'Botan::Gzip_Compression' has pure 
virtual functions
transforms.cc: In function 'void unpack(const 
base64<gzip<INNER> >&, T&)':
transforms.cc:234: error: cannot allocate an object of abstract type 
'Botan::Gzip_Decompression'
gzip.hh:60: note:   since type 'Botan::Gzip_Decompression' has pure 
virtual functions
transforms.cc:243: error: cannot allocate an object of abstract type 
'Botan::Gzip_Decompression'
gzip.hh:60: note:   since type 'Botan::Gzip_Decompression' has pure 
virtual functions


Output of `mtn version --full`:
-------------------------------
N/A