configure.ac: boost_iostreams is required, not optional

Signed-off-by: Hector Martin <marcan@marcan.st>

diff --git a/configure.ac b/configure.ac
index 62ef1b1f113a45206bbf89000c3af2a0ae147a80..dd44739c6caa6e78ddec1496ce5e73376f6c2479 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -933,7 +933,7 @@ AC_CHECK_LIB(boost_system-mt, main, [],
 
 AC_CHECK_LIB(boost_iostreams-mt, main, [],
     [AC_CHECK_LIB(boost_iostreams, main, [],
-        AC_MSG_NOTICE(["Boost iostreams library not found."]))])
+        AC_MSG_FAILURE(["Boost iostreams library not found."]))])
 
 # Find the right boost_thread library.
 BOOST_THREAD_LIBS=""