Adding missing file.

diff --git a/config/64bit.m4 b/config/64bit.m4
new file mode 100644 (file)
index 0000000..a704c65
--- /dev/null
+++ b/config/64bit.m4
@@ -0,0 +1,31 @@
+dnl ---------------------------------------------------------------------------
+dnl Macro: 64BIT
+dnl ---------------------------------------------------------------------------
+AC_ARG_ENABLE(64bit,
+    [  --enable-64bit      Build 64bit library.],
+    [ 
+       org_cflags=$CFLAGS
+       CFLAGS=-m64
+       AC_LANG(C)
+       AC_RUN_IFELSE([
+            AC_LANG_PROGRAM([], [ if (sizeof(void*) != 8) return 1;])
+          ],[
+            CFLAGS="$CFLAGS $org_cflags"
+          ],[
+            AC_MSG_ERROR([Don't know how to build a 64-bit object.])
+          ])
+       org_cxxflags=$CXXFLAGS
+       CXXFLAGS=-m64
+       AC_LANG(C++)
+       AC_RUN_IFELSE([
+            AC_LANG_PROGRAM([], [ if (sizeof(void*) != 8) return 1;])
+          ],[
+            CXXFLAGS="$CXXFLAGS $org_cxxflags"
+          ],[
+            AC_MSG_ERROR([Don't know how to build a 64-bit object.])
+          ])
+
+    ])
+dnl ---------------------------------------------------------------------------
+dnl End Macro: 64BIT
+dnl ---------------------------------------------------------------------------