"make[4]: Leaving directory `/ktorrent-2.1.4/libktorrent/migrate'
Making all in mse
make[4]: Entering directory `/ktorrent-2.1.4/libktorrent/mse'
source='bigint.cpp' object='bigint.lo' libtool=yes \
depfile='.deps/bigint.Plo' tmpdepfile='.deps/bigint.TPlo' \
depmode=gcc3 /bin/sh ../../admin/depcomp \
/bin/sh ../../libtool --silent --mode=compile --tag=CXX g++ -DHAVE_CONFIG_H -I. -I. -I../.. -I./.. -I/usr/include/kde -I/usr/share/qt3/include -I. -DQT_THREAD_SUPPORT -D_REENTRANT -Wno-long-long -Wundef -ansi -D_XOPEN_SOURCE=500 -D_BSD_SOURCE -Wcast-align -Wchar-subscripts -Wall -W -Wpointer-arith -O2 -Wformat-security -Wmissing-format-attribute -Wno-non-virtual-dtor -fno-exceptions -fno-check-new -fno-common -fexceptions -c -o bigint.lo `test -f 'bigint.cpp' || echo './'`bigint.cpp
bigint.cpp: In constructor 'mse::BigInt::BigInt(bt::Uint32)':
bigint.cpp:36: error: 'mpz_init2' was not declared in this scope
bigint.cpp: In constructor 'mse::BigInt::BigInt(const QString&)':
bigint.cpp:41: error: 'mpz_init2' was not declared in this scope
bigint.cpp: In member function 'bt::Uint32 mse::BigInt::toBuffer(bt::Uint8*, bt::Uint32) const':
bigint.cpp:89: error: 'mpz_export' was not declared in this scope
bigint.cpp: At global scope:
bigint.cpp:86: warning: unused parameter 'max_size'
bigint.cpp: In static member function 'static mse::BigInt mse::BigInt::fromBuffer(const bt::Uint8*, bt::Uint32)':
bigint.cpp:96: error: 'mpz_import' was not declared in this scope
make[4]: *** [bigint.lo] Error 1
make[4]: Leaving directory `/ktorrent-2.1.4/libktorrent/mse'
make[3]: *** [all-recursive] Error 1
make[3]: Leaving directory `/ktorrent-2.1.4/libktorrent'
make[2]: *** [all] Error 2
make[2]: Leaving directory `/ktorrent-2.1.4/libktorrent'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/ktorrent-2.1.4'
make: *** [all] Error 2
root@bowser03:/ktorrent-2.1.4# "

I installed python-mpz and it didn't change anything, what does this damn program want with me?

Headers of libgmp maybe.