add boost_chrono, unless c++11

pokerth_game.pro

@@ -26,6 +26,9 @@ DEFINES += ENABLE_IPV6 TIXML_USE_STL BOOST_FILESYSTEM_DEPRECATED
 DEFINES += PREFIX=\"$${PREFIX}\"
 TARGET = pokerth
 
+# Check for c++11
+include(pokerth_common.pro)
+
 # PRECOMPILED_HEADER = src/pch_game.h
 
 android{
@@ -427,6 +430,8 @@ unix:!mac {
 		boost_system-mt
 	BOOST_RANDOM = boost_random \
 		boost_random-mt
+	BOOST_CHRONO = boost_chrono \
+		boost_chrono-mt
 
 	# searching in $PREFIX/lib, $PREFIX/lib64 and $$system(qmake -query QT_INSTALL_LIBS)
 	# to override the default '/usr' pass PREFIX
@@ -482,15 +487,37 @@ unix:!mac {
 				message("Found $$lib")
 				BOOST_SYS = -l$$lib
 			}
+			!c++11 { 
+				for(lib, BOOST_CHRONO):exists($${dir}/lib$${lib}.so*) {
+					message("Found $$lib")
+					BOOST_CHRONO = -l$$lib
+				}
+				for(lib, BOOST_CHRONO):exists($${dir}/lib$${lib}.a) {
+					message("Found $$lib")
+					BOOST_CHRONO = -l$$lib
+				}
+			}
 	}
 	!android{
-		BOOST_LIBS = $$BOOST_THREAD \
+		c++11 {
+			BOOST_LIBS = $$BOOST_THREAD \
 			$$BOOST_FS \
 			$$BOOST_IOSTREAMS \
 			$$BOOST_REGEX \
 			$$BOOST_RANDOM \
 			$$BOOST_SYS
 		!count(BOOST_LIBS, 6):error("Unable to find boost libraries in PREFIX=$${PREFIX}")
+		}
+		!c++11 {
+			BOOST_LIBS = $$BOOST_THREAD \
+			$$BOOST_FS \
+			$$BOOST_IOSTREAMS \
+			$$BOOST_REGEX \
+			$$BOOST_RANDOM \
+			$$$$BOOST_SYS \
+			$$BOOST_CHRONO
+			!count(BOOST_LIBS, 7):error("Unable to find boost libraries in PREFIX=$${PREFIX}")
+		}
 		if($$system(sdl-config --version)):error("sdl-config not found in PATH - libSDL_mixer, libSDL are required!")
 		UNAME = $$system(uname -s)
 		BSD = $$find(UNAME, "BSD")