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[mahdavi <>]

hi,
my program use CGAL::Exact_predicates_exact_constructions_kernel_with_sqrt 
, type  g++ main.cc  -lCGAL in  command in run command ,and follow message 
is occur: 
//////////////////////////////////////////////////////////////////////////////////////////
/tmp/ccgEbXXZ.o: In function `CORE::AddSubRep<CORE::Sub>::op() const':
main.cc:(.text._ZNK4CORE9AddSubRepINS_3SubEE2opEv[CORE::AddSubRep<CORE::Sub>::op()
const]+0x17): undefined reference to `CORE::Sub::name'
/tmp/ccgEbXXZ.o: In function `CORE::AddSubRep<CORE::Add>::op() const':
main.cc:(.text._ZNK4CORE9AddSubRepINS_3AddEE2opEv[CORE::AddSubRep<CORE::Add>::op()
const]+0x17): undefined reference to `CORE::Add::name'
/tmp/ccgEbXXZ.o: In function `CORE::BinOpRep::~BinOpRep()':
main.cc:(.text._ZN4CORE8BinOpRepD2Ev[CORE::BinOpRep::~BinOpRep()]+0x8):
undefined reference to `vtable for CORE::BinOpRep'
/tmp/ccgEbXXZ.o: In function `CORE::UnaryOpRep::~UnaryOpRep()':
main.cc:(.text._ZN4CORE10UnaryOpRepD2Ev[CORE::UnaryOpRep::~UnaryOpRep()]+0x8):
undefined reference to `vtable for CORE::UnaryOpRep'
/tmp/ccgEbXXZ.o: In function `CORE::ConstRep::~ConstRep()':
main.cc:(.text._ZN4CORE8ConstRepD2Ev[CORE::ConstRep::~ConstRep()]+0x7):
undefined reference to `vtable for CORE::ConstRep'
/tmp/ccgEbXXZ.o: In function `CORE::ConstRep::ConstRep()':
main.cc:(.text._ZN4CORE8ConstRepC2Ev[CORE::ConstRep::ConstRep()]+0xd):
undefined reference to `CORE::ExprRep::ExprRep()'
main.cc:(.text._ZN4CORE8ConstRepC2Ev[CORE::ConstRep::ConstRep()]+0x12):
undefined reference to `vtable for CORE::ConstRep'
/tmp/ccgEbXXZ.o: In function `CORE::ConstDoubleRep::ConstDoubleRep()':
main.cc:(.text._ZN4CORE14ConstDoubleRepC1Ev[CORE::ConstDoubleRep::ConstDoubleRep()]+0x12):
undefined reference to `vtable for CORE::ConstDoubleRep'
/tmp/ccgEbXXZ.o: In function `CORE::ConstDoubleRep::ConstDoubleRep(double)':
main.cc:(.text._ZN4CORE14ConstDoubleRepC1Ed[CORE::ConstDoubleRep::ConstDoubleRep(double)]+0x1e):
undefined reference to `vtable for CORE::ConstDoubleRep'
/tmp/ccgEbXXZ.o: In function `CORE::BinOpRep::BinOpRep(CORE::ExprRep*,
CORE::ExprRep*)':
main.cc:(.text._ZN4CORE8BinOpRepC2EPNS_7ExprRepES2_[CORE::BinOpRep::BinOpRep(CORE::ExprRep*,
CORE::ExprRep*)]+0xd): undefined reference to `CORE::ExprRep::ExprRep()'
main.cc:(.text._ZN4CORE8BinOpRepC2EPNS_7ExprRepES2_[CORE::BinOpRep::BinOpRep(CORE::ExprRep*,
CORE::ExprRep*)]+0x12): undefined reference to `vtable for CORE::BinOpRep'
/tmp/ccgEbXXZ.o: In function `CORE::MultRep::MultRep(CORE::ExprRep*,
CORE::ExprRep*)':
main.cc:(.text._ZN4CORE7MultRepC1EPNS_7ExprRepES2_[CORE::MultRep::MultRep(CORE::ExprRep*,
CORE::ExprRep*)]+0x21): undefined reference to `vtable for CORE::MultRep'
/tmp/ccgEbXXZ.o: In function `CORE::UnaryOpRep::UnaryOpRep(CORE::ExprRep*)':
main.cc:(.text._ZN4CORE10UnaryOpRepC2EPNS_7ExprRepE[CORE::UnaryOpRep::UnaryOpRep(CORE::ExprRep*)]+0xd):
undefined reference to `CORE::ExprRep::ExprRep()'
main.cc:(.text._ZN4CORE10UnaryOpRepC2EPNS_7ExprRepE[CORE::UnaryOpRep::UnaryOpRep(CORE::ExprRep*)]+0x12):
undefined reference to `vtable for CORE::UnaryOpRep'
/tmp/ccgEbXXZ.o: In function `CORE::NegRep::NegRep(CORE::ExprRep*)':
main.cc:(.text._ZN4CORE6NegRepC1EPNS_7ExprRepE[CORE::NegRep::NegRep(CORE::ExprRep*)]+0x1a):
undefined reference to `vtable for CORE::NegRep'
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////
please help me , thank and best regard. 
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