$ wget http://www.xmlsoft.org/examples/io2.c
--2017-05-31 15:13:18--  http://www.xmlsoft.org/examples/io2.c
Resolving www.xmlsoft.org... 91.121.203.120
Connecting to www.xmlsoft.org|91.121.203.120|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 1182 (1.2K) [text/plain]
Saving to: `io2.c'

100%[======================================>] 1,182       --.-K/s   in 0s      

2017-05-31 15:13:18 (53.9 MB/s) - `io2.c' saved [1182/1182]

$ gcc -o xmltest -I/usr/include/libxml2 -lxml2 -lz -lm io2.c
$ ./xmltest 
<?xml version="1.0"?>
<root>content</root>
$