1. Propose this patch to upstream:

--- ecore/configure.in.orig     2007-12-09 19:49:37.000000000 +0200
+++ ecore/configure.in  2007-12-09 19:49:54.000000000 +0200
@@ -45,7 +45,7 @@
 requirements_ecore_ipc=""
 requirements_ecore_job=""
 requirements_ecore_txt=""
-requirements_ecore_x=""
+requirements_ecore_x="x11"
 requirements_ecore_win32=""
 requirements_ecore_sdl=""

As far as it's accepted remove workaround "CFLAGS += -I/usr/X11R6/include"
from ecore/debian/rules

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2. There is a similar workaround for evas/debian/rules. Gregale build won't
include evas engine software x11* if CFLAGS is not set

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