Reuse $(CC) set in the makefiles.
CC is set to 'gcc -pthread' if threads are enabled and the -pthread option
is required to get linking to the threads library.

--- Python-2.6.4/configure.in.old	2010-01-14 11:10:41 +0100
+++ Python-2.6.4/configure.in	2010-01-14 11:11:03 +0100
@@ -1771,7 +1771,7 @@
 	FreeBSD*)
 		if [[ "`$CC -dM -E - </dev/null | grep __ELF__`" != "" ]]
 		then
-			LDSHARED="$CC -shared ${LDFLAGS}"
+			LDSHARED='$(CC) -shared ${LDFLAGS}'
 		else
 			LDSHARED="ld -Bshareable ${LDFLAGS}"
 		fi;;