devel/libcryptopp 5.1: compile error - 'NULL_CHANNEL' was not declared in this scope

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sudo port install libcryptopp
--->  Fetching libcryptopp
--->  Verifying checksum(s) for libcryptopp
--->  Extracting libcryptopp
--->  Configuring libcryptopp
--->  Building libcryptopp with target all
Error: Target org.macports.build returned: shell command " cd "/usr/local/var/macports/build/_usr_local_var_macports_sources_rsync.macports.org_release_ports_devel_libcryptopp/work/" && gnumake all -f GNUmakefile " returned error 2
Command output: simple.h:71: error: 'NULL_CHANNEL' was not declared in this scope
simple.h: In member function 'bool CryptoPP::Unflushable<T>::ChannelFlush(const std::string&, bool, int, bool)':
simple.h:80: error: there are no arguments to 'AttachedTransformation' that depend on a template parameter, so a declaration of 'AttachedTransformation' must be available
simple.h:80: error: (if you use '-fpermissive', G++ will accept your code, but allowing the use of an undeclared name is deprecated)
simple.h: In member function 'void CryptoPP::Multichannel<T>::Initialize(const CryptoPP::NameValuePairs&, int)':
simple.h:134: error: 'NULL_CHANNEL' was not declared in this scope
simple.h: In member function 'bool CryptoPP::Multichannel<T>::Flush(bool, int, bool)':
simple.h:136: error: 'NULL_CHANNEL' was not declared in this scope
simple.h: In member function 'bool CryptoPP::Multichannel<T>::MessageSeriesEnd(int, bool)':
simple.h:138: error: 'NULL_CHANNEL' was not declared in this scope
simple.h:138: error: there are no arguments to 'ChannelMessageSeriesEnd' that depend on a template parameter, so a declaration of 'ChannelMessageSeriesEnd' must be available
simple.h: In member function 'byte* CryptoPP::Multichannel<T>::CreatePutSpace(unsigned int&)':
simple.h:140: error: 'NULL_CHANNEL' was not declared in this scope
simple.h: In member function 'unsigned int CryptoPP::Multichannel<T>::Put2(const byte*, unsigned int, int, bool)':
simple.h:142: error: 'NULL_CHANNEL' was not declared in this scope
simple.h: In member function 'unsigned int CryptoPP::Multichannel<T>::PutModifiable2(byte*, unsigned int, int, bool)':
simple.h:144: error: 'NULL_CHANNEL' was not declared in this scope
simple.h: In member function 'bool CryptoPP::Multichannel<T>::ChannelPutModifiable(const std::string&, byte*, unsigned int)':
simple.h:151: error: there are no arguments to 'ChannelPut' that depend on a template parameter, so a declaration of 'ChannelPut' must be available
seckey.h: In member function 'unsigned int CryptoPP::BlockCipherBaseTemplate<INFO, INTERFACE>::BlockSize() const':
seckey.h:159: error: 'BLOCKSIZE' was not declared in this scope
seckey.h: In constructor 'CryptoPP::BlockCipherTemplate<DIR, BASE>::BlockCipherTemplate(const byte*)':
seckey.h:169: error: 'DEFAULT_KEYLENGTH' was not declared in this scope
seckey.h: In constructor 'CryptoPP::BlockCipherTemplate<DIR, BASE>::BlockCipherTemplate(const byte*, unsigned int, unsigned int)':
seckey.h:173: error: there are no arguments to 'SetKeyWithRounds' that depend on a template parameter, so a declaration of 'SetKeyWithRounds' must be available
seckey.h: In constructor 'CryptoPP::MessageAuthenticationCodeTemplate<BASE>::MessageAuthenticationCodeTemplate(const byte*)':
seckey.h:197: error: 'DEFAULT_KEYLENGTH' was not declared in this scope
seckey.h: In member function 'std::string CryptoPP::MessageAuthenticationCodeTemplate<BASE>::AlgorithmName() const':
seckey.h:201: error: there are no arguments to 'StaticAlgorithmName' that depend on a template parameter, so a declaration of 'StaticAlgorithmName' must be available
gnumake: *** [3way.o] Error 1

Error: Status 1 encountered during processing.

[cilly@…]

Sorry, always I paste, the linefeeds are lost. It's not my fault working at paste-systems:

​http://rafb.net/p/teufS283.txt

[cilly@…]

gcc --version powerpc-apple-darwin9-gcc-4.0.1 (GCC) 4.0.1 (Apple Inc. build 5465)

Darwin mercury.local 9.1.0 Darwin Kernel Version 9.1.0: Wed Oct 31 17:48:21 PDT 2007; root:xnu-1228.0.2~1/RELEASE_PPC Power Macintosh