I downloaded the WebKit source code and I am building the source code on ubuntu 10.04 After executing below command, i got errors related to glib-2.31.2.

./autogen.sh --prefix=/usr

I solved those errors and again issued above command. I got below errors.

checking for ZLIB... configure: error: Package requirements (zlib) were not met:

No package 'zlib' found

Consider adjusting the PKG_CONFIG_PATH environment variable if you
installed software in a non-standard prefix.

Alternatively, you may set the environment variables ZLIB_CFLAGS
and ZLIB_LIBS to avoid the need to call pkg-config.
See the pkg-config man page for more details.

Thanks.