kerberos,spidermonkey: fix build on SMP systems

component/kerberos/buildout.cfg

@@ -18,6 +18,6 @@ url = ${kerberos-package:location}/krb5-1.11.1.tar.gz
 configure-command = src/configure
 configure-options =
     --prefix=${buildout:parts-directory}/${:_buildout_section_name_}
-
+make-options = -j1
 environment =
   PATH=${bison:location}/bin:%(PATH)s
\ No newline at end of file

component/spidermonkey/buildout.cfg

@@ -13,7 +13,7 @@ install =
   workdir = os.path.join(guessworkdir(extract_dir), 'src')
   env = self.environ
   env['JS_DIST'] = location
-  call(['make', '-f', 'Makefile.ref'], cwd=workdir, env=env)
+  call(['make', '-f', 'Makefile.ref', '-j1'], cwd=workdir, env=env)
   call(['make', '-f', 'Makefile.ref', 'export'], cwd=workdir, env=env)
 
 [spidermonkey]