skins2: fix linking in OpenBSD (the X11 os factory must be use for linux and OpenBSD at least).

configure.ac

@@ -412,6 +412,7 @@ AM_CONDITIONAL(HAVE_LINUX, [test "${SYS}" = "linux"])
 AM_CONDITIONAL(HAVE_WIN32, test "${SYS}" = "mingw32")
 AM_CONDITIONAL(HAVE_WINCE, test "${SYS}" = "mingwce")
 AM_CONDITIONAL(USE_PEFLAGS, [test "${enable_peflags}" = "yes"])
+AM_CONDITIONAL(USE_X11_FOR_SKINS2, [case "${SYS}" in linux*|openbsd*) true;; *) false;; esac])
 
 dnl
 dnl Sadly autoconf doesn't think about testing foo.exe when ask to test

modules/gui/skins2/Modules.am

@@ -211,7 +211,7 @@ SOURCES_skins2 += \
     $(NULL)
 endif
 
-if HAVE_LINUX
+if USE_X11_FOR_SKINS2
 SOURCES_skins2 += \
 	x11/x11_display.cpp \
 	x11/x11_display.hpp \