--- a/setup.py
+++ b/setup.py
@@ -1885,7 +1885,7 @@
     if OSX:
         pycairo = "py3cairo"
     else:
-        pycairo = "pycairo"
+        pycairo = "py3cairo"
     cython_add(Extension("xpra.client.gtk3.cairo_workaround",
                 ["xpra/client/gtk3/cairo_workaround.pyx"],
                 **pkgconfig(pycairo)
@@ -2363,10 +2363,7 @@
     v4l2_pkgconfig = pkgconfig()
     #fuly warning: cython makes this difficult,
     #we have to figure out if "device_caps" exists in the headers:
-    ENABLE_DEVICE_CAPS = False
-    if os.path.exists("/usr/include/linux/videodev2.h"):
-        hdata = open("/usr/include/linux/videodev2.h").read()
-        ENABLE_DEVICE_CAPS = hdata.find("device_caps")>=0
+    ENABLE_DEVICE_CAPS = True
     kwargs = {"ENABLE_DEVICE_CAPS" : ENABLE_DEVICE_CAPS}
     make_constants("xpra", "codecs", "v4l2", "constants", **kwargs)
     cython_add(Extension("xpra.codecs.v4l2.pusher",
--- a/xpra/x11/bindings/keyboard_bindings.pyx
+++ b/xpra/x11/bindings/keyboard_bindings.pyx
@@ -19,7 +19,7 @@
 
 DEF PATH_MAX = 1024
 DEF DFLT_XKB_RULES_FILE = b"base"
-DEF DFLT_XKB_CONFIG_ROOT = b"/usr/share/X11/xkb"
+DEF DFLT_XKB_CONFIG_ROOT = b"@xkeyboardconfig@/share/X11/xkb"
 
 ###################################
 # Headers, python magic