Greetings I am using some simple boost regex code: const boost::regex eparse("^([[:digit:]]+).*"); (in a header file) boost::cmatch matches; (in a cpp file) from the subroutine if (boost::regex_match(edit.c_str(), matches, eparse)) { // matches[0] contains the original string. matches[n] // contains a sub_match object for each matching // subexpression for (int i = 1; i < matches.size(); i++) { // sub_match::first and sub_match::second are iterators that // refer to the first and one past the last chars of the // matching subexpression std::string match(matches[i].first, matches[i].second); std::cout << "\tmatches[" << i << "] = " << match << std::endl; } } with a makefile: CXXFLAGS = -O2 -g -Wall -fmessage-length=0 -I/usr/local/boost_1_39_0 OBJS = CrossMapper.o CrossMap.o Read.o Target.o LIBS = -L/lib -lboost_regex-xgcc40-mt-1_39 INCLUDE= /usr/local/boost_1_39_0 TARGET = CrossMapper $(TARGET): $(OBJS) $(CXX) -o $(TARGET) $(OBJS) $(LIBS) all: $(TARGET) clean: rm -f $(OBJS) $(TARGET) It links but will not load: Macintosh-8:~/Documents/workspace/CrossMapper mmuratet$ ./CrossMapper dyld: Library not loaded: libboost_regex-xgcc40-mt-1_39.dylib Referenced from: /Users/mmuratet/Documents/workspace/CrossMapper/./ CrossMapper Reason: image not found Trace/BPT trap Macintosh-8:~/Documents/workspace/CrossMapper mmuratet$ I've been chasing this for several hours and can't get anywhere. Can anyone offer any suggestions? Thanks Mike