I am trying to compile existing code provided in examples by zlib, but it is giving me error at the first place itself:
nikhil@nikhil-Vostro-3500:~/zlib-1.2.8/examples$ gcc -o zpipe -g zpipe.c
/tmp/ccVZzqsb.o: In function `def':
/home/nikhil/zlib-1.2.8/examples/zpipe.c:32: undefined reference to `deflateInit_'
/home/nikhil/zlib-1.2.8/examples/zpipe.c:40: undefined reference to `deflateEnd'
/home/nikhil/zlib-1.2.8/examples/zpipe.c:51: undefined reference to `deflate'
/home/nikhil/zlib-1.2.8/examples/zpipe.c:55: undefined reference to `deflateEnd'
/home/nikhil/zlib-1.2.8/examples/zpipe.c:66: undefined reference to `deflateEnd'
/tmp/ccVZzqsb.o: In function `inf':
/home/nikhil/zlib-1.2.8/examples/zpipe.c:90: undefined reference to `inflateInit_'
/home/nikhil/zlib-1.2.8/examples/zpipe.c:98: undefined reference to `inflateEnd'
/home/nikhil/zlib-1.2.8/examples/zpipe.c:109: undefined reference to `inflate'
/home/nikhil/zlib-1.2.8/examples/zpipe.c:116: undefined reference to `inflateEnd'
/home/nikhil/zlib-1.2.8/examples/zpipe.c:121: undefined reference to `inflateEnd'
/home/nikhil/zlib-1.2.8/examples/zpipe.c:130: undefined reference to `inflateEnd'
collect2: error: ld returned 1 exit status
nikhil@nikhil-Vostro-3500:~/zlib-1.2.8/examples$
How can I compile the file correctly?
You're getting a linker error because you haven't told the compiler to link the library that contains the functions that you've used. The usual way of compiling a simple program that uses zlib on Ubuntu would be:
gcc -o foo foo.c -lz
来源：https://stackoverflow.com/questions/22337896/how-to-fix-undefined-references-to-inflate-deflate-functions