Hello, When I make the GiNaC library, it gives the following error messages: Making all in ginsh make[1]: Entering directory `/home/ginac-1.6.1/ginsh' sed -n -f ./ginsh_fcn_help.sed <ginsh.1 >ginsh_fcn_help.h sed -n -f ./ginsh_op_help.sed <ginsh.1 >ginsh_op_help.h icpc -DHAVE_CONFIG_H -I. -I../config -I../ginac -I./../ginac -I../ginac -DIN_GINAC -O2 -xAVX -axAVX -parallel -vec-report -MT ginsh_parser.o -MD -MP -MF .deps/ginsh_parser.Tpo -c -o ginsh_parser.o ginsh_parser.cc mv -f .deps/ginsh_parser.Tpo .deps/ginsh_parser.Po icpc -DHAVE_CONFIG_H -I. -I../config -I../ginac -I./../ginac -I../ginac -DIN_GINAC -O2 -xAVX -axAVX -parallel -vec-report -MT ginsh_lexer.o -MD -MP -MF .deps/ginsh_lexer.Tpo -c -o ginsh_lexer.o ginsh_lexer.cc mv -f .deps/ginsh_lexer.Tpo .deps/ginsh_lexer.Po /bin/sh ../libtool --tag=CXX --mode=link icpc -O2 -xAVX -axAVX -parallel -vec-report -o ginsh ginsh_parser.o ginsh_lexer.o ../ginac/libginac.la-lreadline -lncurses libtool: link: icpc -O2 -xAVX -axAVX -parallel -vec-report -o .libs/ginsh ginsh_parser.o ginsh_lexer.o ..*/ginac/*.libs/libginac.so /usr/lib64/../lib64/libstdc++.so -lm -lreadline -lncurses -Wl,-rpath,/usr/lib64/../lib64 ginsh_parser.o: In function `f_fsolve(GiNaC::container<std::vector> const&)': ginsh_parser.cc:(.text+0x6224): undefined reference to `cln::cl_free_heap_object(cln::cl_heap*)' ginsh_parser.o: In function `f_integer_content(GiNaC::container<std::vector> const&)': ginsh_parser.cc:(.text+0x64d5): undefined reference to `cln::cl_free_heap_object(cln::cl_heap*)' ginsh_parser.o: In function `GiNaC::numeric::~numeric()': ginsh_parser.cc:(.gnu.linkonce.t._ZN5GiNaC7numericD1Ev[.gnu.linkonce.t._ZN5GiNaC7numericD1Ev]+0x1f): undefined reference to `cln::cl_free_heap_object(cln::cl_heap*)' ..*/ginac/*.libs/libginac.so: undefined reference to `cln::cl_I_to_L(cln::cl_I const&)' ..*/ginac/*.libs/libginac.so: undefined reference to `cln::print_complex(std::ostream&, cln::cl_print_flags const&, cln::cl_N const&)' ..*/ginac/*.libs/libginac.so: undefined reference to `cln::cosh(cln::cl_N const&)' ..*/ginac/*.libs/libginac.so: undefined reference to `cln::read_integer(std::istream&, cln::cl_read_flags const&)' ..*/ginac/*.libs/libginac.so: undefined reference to `cln::sqrt(cln::cl_N const&)' ..*/ginac/*.libs/libginac.so: undefined reference to `cln::equal(cln::cl_R const&, cln::cl_R const&)' ..*/ginac/*.libs/libginac.so: undefined reference to `cln::cl_no_ring_init_helper::cl_no_ring_init_helper()' ..*/ginac/*.libs/libginac.so: undefined reference to `cln::ceiling1(cln::cl_R const&)' . . . ...and so on... Intel(R) C++ Intel(R) 64 Compiler XE for applications running on Intel(R) 64, Version 12.0.4.191 Build 20110427 Copyright (C) 1985-2011 Intel Corporation. Added compiler options: -O2 -xAVX -axAVX -parallel -vec-report Linux 64bit Kernel version 2.6.37.6 GiNaC version 1.6.1 cln version 1.3.2 CLN is installed to default path, e.g. /usr/local/lib and /usr/local/include Using gcc compiler, gives the same error. What can I do to correct this? Thank you in advance. Tamas Istvan