diff --git a/lib/common_test/test_server/ts_install.erl b/lib/common_test/test_server/ts_install.erl
index 1951e77741f8..23a0398f262a 100644
--- a/lib/common_test/test_server/ts_install.erl
+++ b/lib/common_test/test_server/ts_install.erl
@@ -118,15 +118,17 @@ unix_autoconf(XConf) ->
     Env = proplists:get_value(crossenv,XConf,[]),
     Host = get_xcomp_flag("host", Flags),
     Build = get_xcomp_flag("build", Flags),
+    ConfigFlags = string:trim(proplists:get_value("configure_flags", Flags, ""),both,"\"")
+        ++ " " ++ os:getenv("CONFIG_FLAGS", ""),
     Threads = [" --enable-shlib-thread-safety" ||
 		  erlang:system_info(threads) /= false],
     Debug = [" --enable-debug-mode" ||
 		string:find(erlang:system_info(system_version),"debug") =/= nomatch],
-    MXX_Build = [[$\s | Y] || Y <- string:lexemes(os:getenv("CONFIG_FLAGS", ""), " \t\n"),
+    MXX_Build = [[$\s | Y] || Y <- string:lexemes(ConfigFlags, " \t\n"),
 		      Y == "--enable-m64-build"
 			  orelse Y == "--enable-m32-build"
                           orelse Y == "--disable-year2038"],
-    Args = Host ++ Build ++ Threads ++ Debug ++ " " ++ MXX_Build,
+    Args = Host ++ Build ++ Threads ++ Debug ++ MXX_Build,
     case filelib:is_file(Configure) of
 	true ->
 	    OSXEnv = macosx_cflags(),
@@ -184,7 +186,7 @@ get_xcomp_flag(Flag, Flags) ->
 get_xcomp_flag(Flag, Tag, Flags) ->
     case proplists:get_value(Flag,Flags) of
 	undefined -> "";
-	"guess" -> [" --",Tag,"=",os:cmd("$ERL_TOP/make/autoconf/config.guess")];
+	"guess" -> [" --",Tag,"=",string:trim(os:cmd("$ERL_TOP/make/autoconf/config.guess"))];
 	HostVal -> [" --",Tag,"=",HostVal]
     end.