--- a/configure.in
+++ b/configure.in
@@ -11,7 +11,7 @@
 AC_PROG_INSTALL
 
 AC_CHECK_LIB(pthread, pthread_create, ,
-	AC_CHECK_LIB(c_r, pthread_create), ,
+	[AC_CHECK_LIB(c_r, pthread_create)], ,
 	[AC_ERROR(POSIX threads not found)])
 AC_SEARCH_LIBS(socket, socket)
 AC_SEARCH_LIBS(gethostbyname, nsl)
