Error in Interpolator Class

Hello Root Users!

I have created a class, which looks like class LUT
{
public:

    ROOT::Math::Interpolator interpolEdep; LUT();
...
}
LUT::LUT() //default constructor
{
interpolEdep=ROOT::Math::Interpolator(0,ROOT::Math::Interpolation::kCSPLINE); ...
}

When compiling / executing from within root (using aclic) .x myfile.cxx+ it works without problems.

However, compiling outside of root, using g++ `root-config --cflags --glibs` -o outputfile myfile.cxx

I get the following errors - see attached file.

Any help would be greatly appreciated.

Yours,
Hermann

-- 
-------------
DI Hermann Fuchs
Div. Medical Radiation Physics
Department of Radiotherapy
Med. Univ. Vienna / AKH Vienna
Währinger Gürtel 18-20
A-1090 Wien

Tel.  + 43 / 1 / 40 400 7271
Mail. hermann.fuchs_at_meduniwien.ac.at




/tmp/ccTOV1Pg.o: In function `LUT::LUT()':

ipolTest.cxx:(.text+0x451): undefined reference to `ROOT::Math::Interpolator::Interpolator(unsigned int, ROOT::Math::Interpolation::Type)'
ipolTest.cxx:(.text+0x467): undefined reference to `ROOT::Math::Interpolator::Interpolator(unsigned int, ROOT::Math::Interpolation::Type)'
ipolTest.cxx:(.text+0x481): undefined reference to `ROOT::Math::Interpolator::operator=(ROOT::Math::Interpolator const&)'
ipolTest.cxx:(.text+0x48d): undefined reference to `ROOT::Math::Interpolator::~Interpolator()'
ipolTest.cxx:(.text+0x56a): undefined reference to `ROOT::Math::Interpolator::~Interpolator()'
ipolTest.cxx:(.text+0x581): undefined reference to `ROOT::Math::Interpolator::~Interpolator()'


/tmp/ccTOV1Pg.o: In function `LUT::LUT(double, double, int)':

ipolTest.cxx:(.text+0x5c2): undefined reference to `ROOT::Math::Interpolator::Interpolator(unsigned int, ROOT::Math::Interpolation::Type)'
ipolTest.cxx:(.text+0x5d8): undefined reference to `ROOT::Math::Interpolator::Interpolator(unsigned int, ROOT::Math::Interpolation::Type)'
ipolTest.cxx:(.text+0x5f2): undefined reference to `ROOT::Math::Interpolator::operator=(ROOT::Math::Interpolator const&)'
ipolTest.cxx:(.text+0x5fe): undefined reference to `ROOT::Math::Interpolator::~Interpolator()'
ipolTest.cxx:(.text+0x6d5): undefined reference to `ROOT::Math::Interpolator::~Interpolator()'
ipolTest.cxx:(.text+0x6ec): undefined reference to `ROOT::Math::Interpolator::~Interpolator()'


/tmp/ccTOV1Pg.o: In function `LUT::~LUT()':

ipolTest.cxx:(.text+0x750): undefined reference to `ROOT::Math::Interpolator::~Interpolator()'


/tmp/ccTOV1Pg.o: In function `LUT::setInterpolEdepData()':

ipolTest.cxx:(.text+0x999): undefined reference to `ROOT::Math::Interpolator::SetData(unsigned int, double const*, double const*)'


/tmp/ccTOV1Pg.o: In function `LUT::getEdep(double)':

ipolTest.cxx:(.text+0xa20): undefined reference to `ROOT::Math::Interpolator::Eval(double) const'


/tmp/ccTOV1Pg.o: In function `LUT::interpolateEnergy(double**, double)':

ipolTest.cxx:(.text+0x12e7): undefined reference to `ROOT::Math::Interpolator::Interpolator(unsigned int, ROOT::Math::Interpolation::Type)'
ipolTest.cxx:(.text+0x1542): undefined reference to `ROOT::Math::Interpolator::SetData(unsigned int, double const*, double const*)'
ipolTest.cxx:(.text+0x15ac): undefined reference to `ROOT::Math::Interpolator::Eval(double) const'
ipolTest.cxx:(.text+0x166a): undefined reference to `ROOT::Math::Interpolator::~Interpolator()'
ipolTest.cxx:(.text+0x168d): undefined reference to `ROOT::Math::Interpolator::~Interpolator()'


/tmp/ccTOV1Pg.o: In function `LUT::interpolateArray(double**, int, double**)':

ipolTest.cxx:(.text+0x16d6): undefined reference to `ROOT::Math::Interpolator::Interpolator(unsigned int, ROOT::Math::Interpolation::Type)'
ipolTest.cxx:(.text+0x16f7): undefined reference to `ROOT::Math::Interpolator::SetData(unsigned int, double const*, double const*)'
ipolTest.cxx:(.text+0x1768): undefined reference to `ROOT::Math::Interpolator::Eval(double) const'
ipolTest.cxx:(.text+0x1799): undefined reference to `ROOT::Math::Interpolator::~Interpolator()'
ipolTest.cxx:(.text+0x17af): undefined reference to `ROOT::Math::Interpolator::~Interpolator()'
collect2: ld returned 1 exit status