diff --git a/configure.in b/configure.in
index e1941d0..4780394 100755
--- a/configure.in
+++ b/configure.in
@@ -4,10 +4,12 @@ dnl     This file is an input file used by the GNU "autoconf" program to
 dnl     generate the file "configure", which is run during the build
 dnl     to configure the system for the local environment.
 
-AC_INIT
-AM_INIT_AUTOMAKE(fcgi, 2.4.0)
+AC_INIT(fcgi, 2.4.0)
+AM_INIT_AUTOMAKE(1.9 foreign)
 
-AM_CONFIG_HEADER(fcgi_config.h)
+AC_CONFIG_HEADERS(fcgi_config.h)
+
+AM_MAINTAINER_MODE
 
 AC_PROG_CC
 AC_PROG_CPP 
@@ -47,6 +49,7 @@ AC_LANG([C])
 
 AC_CHECK_LIB([nsl],       [gethostbyname])
 AC_CHECK_LIB([socket],    [socket]) 
+AC_SEARCH_LIBS(frexp, [m], [], [AC_MSG_ERROR([unable to find the frexp()]) ])
 
 ACX_PTHREAD([THREADED=threaded${EXEEXT}])
 AC_SUBST([THREADED])