c++ - How to make my project files with static library (Snappy) -

i have project using snappy library , makefile it:

cxx=g++ cxxflags=-c -wall lflags= objs=main.o utilities.o framingformat.o crc32.o  snappy.out: $(objs)         $(cxx) $(lflags) $^ -o $@  $(objs): %.o:%.cpp         $(cxx) $(cxxflags) $< -o $@ clean:     -rm -rf *.o .phony: clean 

snappy library has been built earlier.

now run makefile have errors:

g++  main.o utilities.o framingformat.o crc32.o -o snappy.out framingformat.o: in function `compresstoframe(char*, unsigned long, char*, unsigned long*)': framingformat.cpp:(.text+0x5b): undefined reference `snappy_compress' framingformat.o: in function `uncompressfromframedata(char*, unsigned long, char*, unsigned long*)': framingformat.cpp:(.text+0x14a): undefined reference `snappy_uncompress' framingformat.o: in function `maxframelength(unsigned long)': framingformat.cpp:(.text+0x2bf): undefined reference `snappy_max_compressed_length' framingformat.o: in function `uncompresseddatalength(char*, unsigned long, unsigned long*)': framingformat.cpp:(.text+0x2f8): undefined reference `snappy_uncompressed_length' collect2: error: ld returned 1 exit status make: *** [snappy.out] error 1 

it because makefile don't know i'm using snappy libs how solve problem? it's directories:

• snappy/catalog-with-snappy
• snappy/catalog-with-project-using-snappy

[edit] makefile looks this:

cxx=g++ cxxflags=-c -wall lflags= objs=main.o utilities.o framingformat.o crc32.o  snappy.out: $(objs)         $(cxx) $(lflags) $^ -l"../../snappylib1.1.2/snappylib1.1.2" -o $@  $(objs): %.o:%.cpp         $(cxx) $(cxxflags) $< -l"../../snappylib1.1.2/snappylib1.1.2" -o $@ clean:     -rm -rf *.o .phony: clean 

use -lsnappy in linker option, presuming have snappy.so or snappy.a in accessible directory. or may have use directory explicitly