Can't Compile a code!!! I ran into "undefined reference to" error.

andereasmehdi

hi i use cyqwin machine and i am new in linux. i can not compile a code i ran into these errors:


ngram-count.o:ngram-count.cc: (.text+0xa9): undefined reference to `_Opt_Parse'
ngram-count.o:ngram-count.cc: (.text+0x11f): undefined reference to `Vocab::Vocab(unsigned int, unsigned int)'
ngram-count.o:ngram-count.cc: (.text+0x204): undefined reference to `SubVocab::SubVocab(Vocab&)'
ngram-count.o:ngram-count.cc: (.text+0x245): undefined reference to `StopNgramStats::StopNgramStats(Vocab&, SubVocab&, unsigned int)'
ngram-count.o:ngram-count.cc: (.text+0x2b5): undefined reference to `File::File(char const*, char const*, int)'
ngram-count.o:ngram-count.cc: (.text+0x2f7): undefined reference to `File::~File()'
ngram-count.o:ngram-count.cc: (.text+0x31f): undefined reference to `File::File(char const*, char const*, int)'
.
.
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I checked the include addresses in makefile and all are right.
can anybody help me and give me some tips?

Thanks

PHENOMENAL_AB

This problem is due to inefficient linking of header file with your code.
you should add "-lm" to your compiling command in terminal at last.
it will fix the problem.