[xml] Trouble compiling a library

I discovered libxml a few weeks ago, and after a few days playing with it, I decided to build my own library 
using libxml.
I have my lib.c and my lib.h files ready to be compiled.

Problem, I'm having issues to compile them, as I'm overwhelmed with error messages during the compilation.

Here is the content of my folders :

my root : /home/emmji/tmp/xml

----/libxml2-2.7.8 (kept intact since installation)
                 ----/ (all the .h files)
           ---- Makefile
           ---- (all the rest ...)
      ----/ (all the rest ...)
----/xmlinst (the installation folder)
---- lib.c
---- lib.h

My lib.h contains : 
#include <stdio.h>
#include <string.h>
#include "libxml2-2.7.8/include/libxml/parser.h"
#include "libxml2-2.7.8/include/libxml/tree.h"

and my lib.c : 
#include "lib.h"

The problem is that I don't understand what's going on : is there a problem with libxml itself (i doubt it)? 
is there a problem of path in my declaration ? why for example, in parser.h, tree.h is linked as 
"libxml/tree.h" (because like that, it's normal that it's not found...) ? Do I miss a environment variable 
somewhere ?

I put at the end of my message a part of the errors : 

Thanks for your help.



[emmji xml]$ gcc -c lib.c
In file included from lib.h:25,
                 from lib.c:24:
libxml2-2.7.8/include/libxml/parser.h:15:31: error: libxml/xmlversion.h: No such file or directory
libxml2-2.7.8/include/libxml/parser.h:16:25: error: libxml/tree.h: No such file or directory
libxml2-2.7.8/include/libxml/parser.h:17:25: error: libxml/dict.h: No such file or directory
libxml2-2.7.8/include/libxml/parser.h:18:25: error: libxml/hash.h: No such file or directory
libxml2-2.7.8/include/libxml/parser.h:19:26: error: libxml/valid.h: No such file or directory
libxml2-2.7.8/include/libxml/parser.h:20:29: error: libxml/entities.h: No such file or directory
libxml2-2.7.8/include/libxml/parser.h:21:29: error: libxml/xmlerror.h: No such file or directory
libxml2-2.7.8/include/libxml/parser.h:22:30: error: libxml/xmlstring.h: No such file or directory
In file included from lib.h:25,
                 from lib.c:24:
libxml2-2.7.8/include/libxml/parser.h:52: error: expected ')' before '*' token
libxml2-2.7.8/include/libxml/parser.h:56: error: expected specifier-qualifier-list before 
libxml2-2.7.8/include/libxml/parser.h:187: error: expected specifier-qualifier-list before 'xmlDocPtr'

(... many others errors on parser.h ...)

libxml2-2.7.8/include/libxml/parser.h:1174: error: expected '=', ',', ';', 'asm' or '__attribute__' before 
libxml2-2.7.8/include/libxml/parser.h:1229: error: expected '=', ',', ';', 'asm' or '__attribute__' before 
In file included from lib.h:26,
                 from lib.c:24:
libxml2-2.7.8/include/libxml/tree.h:35: error: conflicting types for 'xmlParserInputPtr'
libxml2-2.7.8/include/libxml/parser.h:801: error: previous declaration of 'xmlParserInputPtr' was here
libxml2-2.7.8/include/libxml/tree.h:88: error: expected specifier-qualifier-list before 'xmlChar'

In file included from lib.h:26,
                 from lib.c:24:
libxml2-2.7.8/include/libxml/tree.h:294:30: error: libxml/xmlregexp.h: No such file or directory
libxml2-2.7.8/include/libxml/tree.h:310: error: expected ':', ',', ';', '}' or '__attribute__' before '*' 
libxml2-2.7.8/include/libxml/tree.h:353: error: expected ':', ',', ';', '}' or '__attribute__' before '*' 

(... many others errors on tree.h ...)

libxml2-2.7.8/include/libxml/tree.h:1213: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'int'
libxml2-2.7.8/include/libxml/tree.h:1218: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'int'
In file included from lib.c:24:
lib.h:39: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'xmlNewDoc'
lib.h:41: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'xmlNodePtr'
lib.h:44: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'xmlNodePtr'
lib.h:47: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'xmlNodePtr'
lib.h:52: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'xmlNodePtr'
lib.h:55: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'xmlNodePtr'
lib.h:59: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'int'
lib.h:64: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'void'
lib.c:43: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'xmlNewDoc'
lib.c:66: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'xmlNodePtr'
lib.c:90: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'xmlNodePtr'
lib.c:115: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'xmlNodePtr'
lib.c:141: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'xmlNodePtr'
lib.c:166: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'xmlNodePtr'
lib.c:193: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'int'
lib.c:218: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'void'

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