Something

# patch "classes/base.bbclass"
#  from [fcc13f1415d2d612ba2fa44a5322ecb1b9e269f8]
#    to [c0e4dc70853d7b6aa334958c55f4789c958c690a]
#
============================================================
--- classes/base.bbclass        fcc13f1415d2d612ba2fa44a5322ecb1b9e269f8
+++ classes/base.bbclass        c0e4dc70853d7b6aa334958c55f4789c958c690a
@@ -677,20 +677,23 @@ def base_after_parse_two(d):
 def base_after_parse_two(d):
     import bb
     import exceptions
-    need_host = bb.data.getVar('COMPATIBLE_HOST', d, 1)
-    if need_host:
-        import re
-        this_host = bb.data.getVar('HOST_SYS', d, 1)
-        if not re.match(need_host, this_host):
-            raise bb.parse.SkipPackage("incompatible with host %s" % this_host)

-    need_machine = bb.data.getVar('COMPATIBLE_MACHINE', d, 1)
-    if need_machine:
-        import re
-        this_machine = bb.data.getVar('MACHINE', d, 1)
-        if this_machine and not re.match(need_machine, this_machine):
-            raise bb.parse.SkipPackage("incompatible with machine %s" % this_machine)
+    source_mirror_fetch = bb.data.getVar('SOURCE_MIRROR_FETCH', d, 0)
+    if not source_mirror_fetch:
+           need_host = bb.data.getVar('COMPATIBLE_HOST', d, 1)
+           if need_host:
+               import re
+               this_host = bb.data.getVar('HOST_SYS', d, 1)
+               if not re.match(need_host, this_host):
+                   raise bb.parse.SkipPackage("incompatible with host %s" % this_host)

+           need_machine = bb.data.getVar('COMPATIBLE_MACHINE', d, 1)
+           if need_machine:
+               import re
+               this_machine = bb.data.getVar('MACHINE', d, 1)
+               if this_machine and not re.match(need_machine, this_machine):
+                   raise bb.parse.SkipPackage("incompatible with machine %s" % this_machine)
+
     pn = bb.data.getVar('PN', d, 1)

     # OBSOLETE in bitbake 1.7.4