diff --git a/ChangeLog b/ChangeLog
index c426a85319..a739bd969d 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Tue Dec 27 14:09:39 2005  Minero Aoki  <aamine@loveruby.net>
+
+	* process.c: new method Process.exec. [ruby-dev:28107]
+
 Tue Dec 27 08:22:15 2005  GOTOU Yuuzou  <gotoyuzo@notwork.org>
 
 	* ext/openssl/lib/openssl/ssl.rb (OpenSSL::SSL::SSLSocket#post_connection_chech):
diff --git a/process.c b/process.c
index 05dee4521c..d566c18b6b 100644
--- a/process.c
+++ b/process.c
@@ -2632,7 +2632,7 @@ proc_setgroups(VALUE obj, VALUE ary)
 
     ngroups = RARRAY(ary)->len;
     if (ngroups > maxgroups)
-	rb_raise(rb_eArgError, "too many groups, %d max", maxgroups);
+	rb_raise(rb_eArgError, "too many groups, %lu max", (unsigned long)maxgroups);
 
     groups = ALLOCA_N(rb_gid_t, ngroups);
 
@@ -3583,6 +3583,7 @@ Init_process(void)
 #endif
 #endif
 
+    rb_define_singleton_method(rb_mProcess, "exec", rb_f_exec, -1);
     rb_define_singleton_method(rb_mProcess, "fork", rb_f_fork, 0);
     rb_define_singleton_method(rb_mProcess, "spawn", rb_f_spawn, -1);
     rb_define_singleton_method(rb_mProcess, "exit!", rb_f_exit_bang, -1);