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diff --git a/ChangeLog b/ChangeLog
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--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,14 @@
+2013-12-27  Paul Eggert  <eggert@cs.ucla.edu>
+
+        Port xcrun configuration to GNU/Linux.
+        * configure.ac (xcsdkdir): Default to empty.
+        (XCRUN): Don't require Darwin for xcrun.  Move xcrun checking to
+        just before AM_INIT_AUTOMAKE, to make the dependency between it
+        and automake clearer.
+        (CC): Don't use AC_PROG_CC twice; only the first use expands to the
+        shell code that is wanted, which breaks 'configure' on non-Darwin
+        platforms.  Instead, fix CC by hand if it's not found.
+
 2013-12-27  Jan Djärv  <jan.h.d@swipnet.se>
 
         * configure.ac: Detect xcrun on OSX and use it for make, gcc and