--- a/configure.ac
+++ b/configure.ac
@@ -916,7 +916,10 @@
 
 # The alias functions want to know the native off_t bits.
 # "Native" also means large file offsets, if enabled, it's what is native to the mpg123 library.
-if test "x$ac_cv_sizeof_long" = "x"; then 
+if test "x$ac_cv_sizeof_off_t" != "x"; then 
+  LFS_ALIAS_BITS=`expr "$ac_cv_sizeof_off_t" "*" "8"`
+  AC_DEFINE_UNQUOTED([LFS_ALIAS_BITS], $LFS_ALIAS_BITS,
+elif test "x$ac_cv_sizeof_long" = "x"; then 
   AC_MSG_ERROR([Cannot determine sizeof(long)?])
 else
   LFS_ALIAS_BITS=`expr "$ac_cv_sizeof_long" "*" "8"`
--- a/configure
+++ b/configure
@@ -14836,7 +14836,14 @@
 
 # The alias functions want to know the native off_t bits.
 # "Native" also means large file offsets, if enabled, it's what is native to the mpg123 library.
-if test "x$ac_cv_sizeof_long" = "x"; then
+if test "x$ac_cv_sizeof_off_t" != "x"; then
+  LFS_ALIAS_BITS=`expr "$ac_cv_sizeof_off_t" "*" "8"`
+
+cat >>confdefs.h <<_ACEOF
+#define LFS_ALIAS_BITS $LFS_ALIAS_BITS
+_ACEOF
+
+elif test "x$ac_cv_sizeof_long" = "x"; then
   as_fn_error $? "Cannot determine sizeof(long)?" "$LINENO" 5
 else
   LFS_ALIAS_BITS=`expr "$ac_cv_sizeof_long" "*" "8"`