File fix-missing-pthread-library.patch of Package knightsgame

diff -Nur knights_025_src/Makefile new/Makefile
--- knights_025_src/Makefile	2014-04-26 15:56:08.000000000 +0200
+++ new/Makefile	2021-07-03 21:20:42.747153946 +0200
@@ -1627,11 +1627,11 @@
 	  rm -f $*.d
 
 $(KNIGHTS_BINARY_NAME): $(OFILES_MAIN)
-	$(CXX) $(CPPFLAGS) $(CXXFLAGS) -o $@ $^ `sdl-config --libs` `freetype-config --libs` `curl-config --libs` -lfontconfig -lX11 $(BOOST_LIBS)
+	$(CXX) $(CPPFLAGS) $(CXXFLAGS) -o $@ $^ `sdl-config --libs` `freetype-config --libs` `curl-config --libs` -lfontconfig -lX11 -lpthread $(BOOST_LIBS)
 
 
 $(SERVER_BINARY_NAME): $(OFILES_SERVER)
-	$(CXX) $(CPPFLAGS) $(CXXFLAGS) -o $@ $^ `curl-config --libs` $(BOOST_LIBS)
+	$(CXX) $(CPPFLAGS) $(CXXFLAGS) -o $@ $^ `curl-config --libs` -lpthread $(BOOST_LIBS)
 
 
 clean: