Issue #1633863: Don't ignore $CC under AIX.
diff --git a/configure b/configure
index a3826ef..0199ba0 100755
--- a/configure
+++ b/configure
@@ -1,5 +1,5 @@
 #! /bin/sh
-# From configure.in Revision: 84674 .
+# From configure.in Revision: 84752 .
 # Guess values for system-dependent variables and create Makefiles.
 # Generated by GNU Autoconf 2.65 for python 3.2.
 #
@@ -3144,7 +3144,7 @@
 else
 
 	case $ac_sys_system in
-	AIX*)   CC=cc_r
+	AIX*)   CC=${CC:-xlc_r}
 		without_gcc=;;
 	*)	without_gcc=no;;
 	esac
@@ -9230,7 +9230,6 @@
     OPT="-DDYNAMIC_ANNOTATIONS_ENABLED=1 $OPT"
 fi
 
-
 # -I${DLINCLDIR} is added to the compile rule for importdl.o
 
 DLINCLDIR=.