Error Deflate And Inflate With zLib

I'm trying to compile the zpipe.c example in my Linux(Ubuntu 8.04) with gcc, but I'm getting some errors, take a look: ``` [ubuntu@eeepc:~/Desktop] gcc zpipe.c /tmp/ccczEQxz.o: In function `def': zpipe.c:(.text+0x65): undefined reference to `deflateInit_' zpipe.c:(.text+0xd3): undefined reference to `deflateEnd' zpipe.c:(.text+0x150): undefined reference to `deflate' zpipe.c:(.text+0x1e8): undefined reference to `deflateEnd' zpipe.c:(.text+0x27b): undefined reference to `deflateEnd' /tmp/ccczEQxz.o: In function `inf': zpipe.c:(.text+0x314): undefined reference to `inflateInit_' zpipe.c:(.text+0x382): undefined reference to `inflateEnd' zpipe.c:(.text+0x3d7): undefined reference to `inflate' zpipe.c:(.text+0x44b): undefined reference to `inflateEnd' zpipe.c:(.text+0x4c1): undefined reference to `inflateEnd' zpipe.c:(.text+0x4f6): undefined reference to `inflateEnd' collect2: ld returned 1 exit status [ubuntu@eeepc:~/Desktop] ``` Remember that I've installed zLib-dev correctly, but why i'm getting this errors?