See bottom of http://buildbot.xfce.org/builders/xfwm4-openbsd/builds/363/steps/gmake/logs/stdio According to http://developer.gnome.org/glib/2.32/glib-String-Utility-Functions.html#g-strcasecmp g_strcasecmp is deprecated since glib 2.2 and g_strncasecmp() should be used instead. occurences : ./xfwm4/build/src/client.c: if (strlen (hostname) && (display_info->hostname) && (g_strcasecmp (display_info->hostname, hostname))) ./xfwm4/build/src/transients.c: !g_strcasecmp (c1->hostname, c2->hostname))); g_strncasecmp(x,y,min(strlen(x),strlen(y))) should probably do the trick.
Fixed in http://git.xfce.org/xfce/xfwm4/commit/?id=f73398ac024a2185e3b9064231bd64ba185c780b & http://git.xfce.org/xfce/xfwm4/commit/?id=3b7356aef7383e06e24d49446807d35b74475809