Make configure die if libxml2-dev or equivalent isn't installed.
This probably is wrong since it looks like we're picking libxml2
up from Pidgin, so if it is wrong, feel free to disapprove this rev.
/* pre_config.h. Generated by configure. */
/* pre_config.h.in. Generated from configure.ac by autoheader. */
/* our header */
#ifndef _GF_CONFIG_H
#define _GF_CONFIG_H
/* Define to one of `_getb67', `GETB67', `getb67' for Cray-2 and Cray-YMP
systems. This function is required for `alloca.c' support on those systems.
*/
/* #undef CRAY_STACKSEG_END */
/* Define to 1 if using `alloca.c'. */
/* #undef C_ALLOCA */
/* Define if debugging is enabled. */
#define DEBUG 1
/* Define to 1 if translation of program messages to the user's native