--- a/configure.in
+++ b/configure.in
@@ -17,10 +17,12 @@
 rend_posix=true
 
 STATIC_LIBS=no
 CPPFLAGS="${CPPFLAGS} -g"
 
+AM_MAINTAINER_MODE
+
 dnl fix freebsd's broken (?) libpthread
 AC_CHECK_LIB(c_r,pthread_creat,THREAD_LIBS="-lc_r", [
   AC_CHECK_LIB(pthread,pthread_create,THREAD_LIBS="-lpthread") ])
 AC_SUBST(THREAD_LIBS)