diff -r 719c11b6b6ff configure.ac
--- a/configure.ac	Wed Apr 06 09:50:03 2016 +0300
+++ b/configure.ac	Wed Apr 06 19:08:35 2016 +0800
@@ -2739,6 +2766,21 @@
 	SIGNAL_OBJS="Parser/intrcheck.o Python/sigcheck.o"
 fi
 
+# Determine if _decimal should be used.
+AC_SUBST(USE_SIGNAL_MODULE)
+AC_MSG_CHECKING(for --with-decimal-module)
+AC_ARG_WITH(decimal-module,
+            AS_HELP_STRING([--with-decimal-module], [disable/enable decimal module]))
+
+if test -z "$with_decimal_module"
+then with_decimal_module="yes"
+fi
+AC_MSG_RESULT($with_decimal_module)
+
+if test "${with_decimal_module}" = "yes"; then
+	AC_DEFINE(USE_DECIMAL_MODULE, 1, [Define to 1 if _decimal should be built])
+fi
+
 # This is used to generate Setup.config
 AC_SUBST(USE_THREAD_MODULE)
 USE_THREAD_MODULE=""
diff -r 719c11b6b6ff setup.py
--- a/setup.py	Wed Apr 06 09:50:03 2016 +0300
+++ b/setup.py	Wed Apr 06 19:17:58 2016 +0800
@@ -1513,7 +1518,8 @@
                                   ['cjkcodecs/_codecs_%s.c' % loc]))
 
         # Stefan Krah's _decimal module
-        exts.append(self._decimal_ext())
+        if sysconfig.get_config_var('USE_DECIMAL_MODULE'):
+            exts.append(self._decimal_ext())
 
         # Thomas Heller's _ctypes module
         self.detect_ctypes(inc_dirs, lib_dirs)