diff --git a/ase/config.h.in b/ase/config.h.in
index 283cf2b3..072bc718 100644
--- a/ase/config.h.in
+++ b/ase/config.h.in
@@ -7,6 +7,12 @@
 /* Unknown Endian */
 #undef XP_ENDIAN_UNKNOWN
 
+/* long long */
+#undef XP_HAVE_LONG_LONG
+
+/* long double */
+#undef XP_HAVE_LONG_DOUBLE
+
 /* fcntl.h */
 #undef XP_HAVE_FCNTL_H
 
diff --git a/ase/configure.ac b/ase/configure.ac
index 4a8b5458..16e25bea 100644
--- a/ase/configure.ac
+++ b/ase/configure.ac
@@ -1,6 +1,6 @@
 AC_PREREQ(2.53)
 AC_INIT([xpkit], [deb-0.1.0])
-AC_REVISION([$Revision: 1.15 $])
+AC_REVISION([$Revision: 1.16 $])
 AC_CONFIG_HEADER([xp/config.h])
 
 # Checks for programs.
@@ -25,6 +25,10 @@ AC_C_BIGENDIAN(
 	[AC_DEFINE([XP_ENDIAN_LITTLE],[],[Little Endian])],
 	[AC_DEFINE([XP_ENDIAN_UNKNOWN],[],[Unknown Endian])])
 
+# Checks for data types
+AC_CHECK_TYPE(long long, [AC_DEFINE([XP_HAVE_LONG_LONG],[],[long long])])
+AC_CHECK_TYPE(long double, [AC_DEFINE([XP_HAVE_LONG_DOUBLE],[],[long double])])
+
 # Checks for library functions.
 #AC_FUNC_MEMCMP
 #AC_FUNC_REALLOC