configure: Add another warning in case --disable-pthread is used

... while POSIX threads are available.

Various features don't even compile when not using threads.

diff --git a/configure.in b/configure.in
index 07f2fd9..3ec78e0 100644 (file)
--- a/configure.in
+++ b/configure.in
@@ -462,6 +462,7 @@ AC_ARG_ENABLE(pthread,
   if test $have_pthread = yes; then
      AC_MSG_WARN([pthreads seem to be available but you are using --disable-pthread.])
      AC_MSG_WARN([This is almost always a mistake and can render Privoxy unacceptable slow.])
+     AC_MSG_WARN([Also various Privoxy features only work when using threads and won't even compile without them.])
   fi
   have_pthread=no
 fi])