Update instructions for EXTRA_CFLAGS: configure ignores
them; they have to be passed to make.
diff --git a/Misc/SpecialBuilds.txt b/Misc/SpecialBuilds.txt
index ae9ab4c..e0b3315 100644
--- a/Misc/SpecialBuilds.txt
+++ b/Misc/SpecialBuilds.txt
@@ -1,8 +1,8 @@
This file describes some special Python build types enabled via
compile-time preprocessor defines.
-It is best to define these options in the EXTRA_CFLAGS environment variable;
-``EXTRA_CFLAGS="-DPy_REF_DEBUG" ./configure``.
+It is best to define these options in the EXTRA_CFLAGS make variable;
+``make EXTRA_CFLAGS="-DPy_REF_DEBUG"``.
---------------------------------------------------------------------------
Py_REF_DEBUG introduced in 1.4