+AC_MSG_CHECKING([whether your system likes memcpy + HKEY])
+AC_TRY_COMPILE([
+#define _GNU_SOURCE
+#include <ctype.h>
+#include <errno.h>
+#include <string.h>
+#include <unistd.h>
+#include <string.h>
+#include <stdio.h>
+#include <sys/select.h>
+#include <fcntl.h>
+#include <sys/types.h>
+
+#include "lib/libcitadel.h"
+],
+[
+ char foo[22];
+ memcpy(foo, HKEY("foo"));
+
+],
+ [
+
+ AC_MSG_RESULT([yes])
+ ],
+ [
+ AC_DEFINE(UNDEF_MEMCPY, [], [whether we need to undefine memcpy])
+ AC_MSG_RESULT([no])
+ ]
+)
+
+dnl Checks for the Expat XML parser.
+AC_CHECK_HEADER(expat.h,
+ [AC_CHECK_LIB(expat, XML_ParserCreateNS,
+ [
+ LIBS="-lexpat $LIBS"
+ ],
+ [
+ AC_MSG_ERROR(The Expat XML parser was not found and is required. More info: http://www.citadel.org/doku.php/installation:start)
+ ]
+ ,
+ )],
+ [
+ AC_MSG_ERROR(expat.h was not found and is required. More info: http://www.citadel.org/doku.php/installation:start)
+ ]
+)
+