Fix for bpo-32521: nis libnsl (#5190) backported to python 3.5
Index: b/setup.py
===================================================================
*** a/setup.py
--- b/setup.py
*************** class PyBuildExt(build_ext):
*** 1301,1320 ****
              exts.append( Extension('termios', ['termios.c']) )
              # Jeremy Hylton's rlimit interface
              exts.append( Extension('resource', ['resource.c']) )

!             # Sun yellow pages. Some systems have the functions in libc.
!             if (host_platform not in ['cygwin', 'qnx6'] and
!                 find_file('rpcsvc/yp_prot.h', inc_dirs, []) is not None):
!                 if (self.compiler.find_library_file(lib_dirs, 'nsl')):
!                     libs = ['nsl']
!                 else:
!                     libs = []
!                 exts.append( Extension('nis', ['nismodule.c'],
!                                        libraries = libs) )
!             else:
!                 missing.append('nis')
          else:
!             missing.extend(['nis', 'resource', 'termios'])

          # Curses support, requiring the System V version of curses, often
          # provided by the ncurses library.
--- 1301,1314 ----
              exts.append( Extension('termios', ['termios.c']) )
              # Jeremy Hylton's rlimit interface
              exts.append( Extension('resource', ['resource.c']) )
+         else:
+             missing.extend(['resource', 'termios'])

!         nis = self._detect_nis(inc_dirs, lib_dirs)
!         if nis is not None:
!             exts.append(nis)
          else:
!             missing.append('nis')

          # Curses support, requiring the System V version of curses, often
          # provided by the ncurses library.
*************** class PyBuildExt(build_ext):
*** 2153,2158 ****
--- 2147,2198 ----
          )
          return ext

+     def _detect_nis(self, inc_dirs, lib_dirs):
+         if host_platform in {'win32', 'cygwin', 'qnx6'}:
+             return None
+
+         libs = []
+         library_dirs = []
+         includes_dirs = []
+
+         # bpo-32521: glibc has deprecated Sun RPC for some time. Fedora 28
+         # moved headers and libraries to libtirpc and libnsl. The headers
+         # are in tircp and nsl sub directories.
+         rpcsvc_inc = find_file(
+             'rpcsvc/yp_prot.h', inc_dirs,
+             [os.path.join(inc_dir, 'nsl') for inc_dir in inc_dirs]
+         )
+         rpc_inc = find_file(
+             'rpc/rpc.h', inc_dirs,
+             [os.path.join(inc_dir, 'tirpc') for inc_dir in inc_dirs]
+         )
+         if rpcsvc_inc is None or rpc_inc is None:
+             # not found
+             return None
+         includes_dirs.extend(rpcsvc_inc)
+         includes_dirs.extend(rpc_inc)
+
+         if self.compiler.find_library_file(lib_dirs, 'nsl'):
+             libs.append('nsl')
+         else:
+             # libnsl-devel: check for libnsl in nsl/ subdirectory
+             nsl_dirs = [os.path.join(lib_dir, 'nsl') for lib_dir in lib_dirs]
+             libnsl = self.compiler.find_library_file(nsl_dirs, 'nsl')
+             if libnsl is not None:
+                 library_dirs.append(os.path.dirname(libnsl))
+                 libs.append('nsl')
+
+         if self.compiler.find_library_file(lib_dirs, 'tirpc'):
+             libs.append('tirpc')
+
+         return Extension(
+             'nis', ['nismodule.c'],
+             libraries=libs,
+             library_dirs=library_dirs,
+             include_dirs=includes_dirs
+         )
+
+
  class PyBuildInstall(install):
      # Suppress the warning about installation into the lib_dynload
      # directory, which is not in sys.path when running Python during