Issue #27895: Spelling fixes (Contributed by Ville Skyttä).
diff --git a/configure.ac b/configure.ac
index 2e0cb39..f68069d 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1639,7 +1639,7 @@
# Calculate an appropriate deployment target for this build:
# The deployment target value is used explicitly to enable certain
# features are enabled (such as builtin libedit support for readline)
- # through the use of Apple's Availabiliy Macros and is used as a
+ # through the use of Apple's Availability Macros and is used as a
# component of the string returned by distutils.get_platform().
#
# Use the value from: