diff --git a/ChangeLog b/ChangeLog
index c2822bfae7..3a05762c55 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,11 @@
+Wed Aug 15 01:59:19 2001  Akinori MUSHA  <knu@iDaemons.org>
+
+	* ext/digest/defs.h: Define NO_UINT64_T instead of emitting an
+	  error to fail.
+
+	* ext/digest/sha2/extconf.rb: Do not exit on error, and utilize
+	  NO_UINT64_T to detect if the system has a 64bit integer type.
+
 Tue Aug 14 21:14:07 2001  Akinori MUSHA  <knu@iDaemons.org>
 
 	* ext/digest/sha2/extconf.rb: do not create Makefile when no 64bit
diff --git a/ext/digest/defs.h b/ext/digest/defs.h
index 47bf7d030a..7af8f52324 100644
--- a/ext/digest/defs.h
+++ b/ext/digest/defs.h
@@ -27,7 +27,7 @@
 # elif defined(_MSC_VER)
   typedef unsigned _int64 uint64_t;
 # else
-#  error What is a 64bit integer type on this system?
+#  define NO_UINT64_T
 # endif
 #endif
 
diff --git a/ext/digest/sha2/extconf.rb b/ext/digest/sha2/extconf.rb
index 144f266b20..412b2d4301 100644
--- a/ext/digest/sha2/extconf.rb
+++ b/ext/digest/sha2/extconf.rb
@@ -17,12 +17,18 @@ have_header("inttypes.h")
 
 have_header("unistd.h")
 
-unless try_link(<<SRC, $defs.join(' '))
+if try_run(<<SRC, $defs.join(' '))
 #include "../defs.h"
-main(){}
+int main(void) {
+#ifdef NO_UINT64_T
+    return 1;
+#else
+    return 0;
+#endif
+}
 SRC
+then
+  create_makefile("digest/sha2")
+else
   puts "** Cannot find a 64bit integer type - skipping the SHA2 module."
-  exit 1
 end
-
-create_makefile("digest/sha2")