diff -Naur centerim-4.22.10.orig/libicq2000/libicq2000/sigslot.h centerim-4.22.10/libicq2000/libicq2000/sigslot.h
--- centerim-4.22.10.orig/libicq2000/libicq2000/sigslot.h	2010-10-26 19:19:06.000000000 +0200
+++ centerim-4.22.10/libicq2000/libicq2000/sigslot.h	2012-09-15 21:46:10.469007313 +0200
@@ -84,6 +84,7 @@
 
 #include <set>
 #include <list>
+#include <unistd.h>
 
 #if defined(SIGSLOT_PURE_ISO) || (!defined(WIN32) && !defined(SIGSLOT_USE_POSIX_THREADS))
 #       define _SIGSLOT_SINGLE_THREADED