AC_STRUCT_TIMEZONE
#
-dnl what's the type of timezone?
+dnl ** what's the type of timezone?
AC_TYPE_TIMEZONE
#
-dnl do we have altzone?
+dnl ** do we have altzone?
AC_ALTZONE
+dnl ** what are the sizes of various types
+dnl (these must come before GHC_CHECK_ALIGNMENT)
+AC_CHECK_SIZEOF(unsigned int,4)
+AC_CHECK_SIZEOF(float,4)
+AC_CHECK_SIZEOF(double,8)
+
+dnl ** what are alignment constraints on various types
+GHC_CHECK_ALIGNMENT(unsigned int) dnl redundant but harmless
+GHC_CHECK_ALIGNMENT(float)
+GHC_CHECK_ALIGNMENT(double)
+
#
dnl ** check for specific library functions that we are interested in
#