Add -Wcast-align
diff --git a/configure.ac b/configure.ac
index acfc2ea..cbabf83 100644
--- a/configure.ac
+++ b/configure.ac
@@ -69,6 +69,9 @@
 	# Hide inline methods
 	CXXFLAGS="$CXXFLAGS -fvisibility-inlines-hidden"
 
+	# Assorted warnings
+	CXXFLAGS="$CXXFLAGS -Wcast-align"
+
 	case "$host" in
 		arm-*-*)
 			# Request byte alignment on arm
diff --git a/src/Makefile.am b/src/Makefile.am
index f7cf593..b981346 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -8,7 +8,7 @@
 MAINTAINERCLEANFILES =
 DISTCHECK_CONFIGURE_FLAGS = --enable-introspection
 
-# The following warning options are useful for debugging: -Wpadded -Wcast-align
+# The following warning options are useful for debugging: -Wpadded
 #AM_CXXFLAGS =
 
 lib_LTLIBRARIES = libharfbuzz.la