diff --git a/configure b/configure
index b3f32868f..41f532230 100755
--- a/configure
+++ b/configure
@@ -2,7 +2,7 @@
 # Guess values for system-dependent variables and create Makefiles.
 # Generated by GNU Autoconf 2.53 for wsjt 5.9.2.
 #
-# $Id: configure.ac 110 2006-01-15 23:32:39Z va3db $
+# $Id: configure.ac 113 2006-01-16 02:07:25Z va3db $
 #
 # Copyright 1992, 1993, 1994, 1995, 1996, 1998, 1999, 2000, 2001, 2002
 # Free Software Foundation, Inc.
@@ -926,7 +926,7 @@ Free Software Foundation, Inc.
 This configure script is free software; the Free Software Foundation
 gives unlimited permission to copy, distribute and modify it.
 
-$Id: configure.ac 110 2006-01-15 23:32:39Z va3db $
+$Id: configure.ac 113 2006-01-16 02:07:25Z va3db $
 _ACEOF
   exit 0
 fi
@@ -5919,6 +5919,11 @@ echo "$as_me: error: You need samplerate.h to use --enable-portaudio" >&2;}
 	fi
 fi
 
+if test "$F2PY" = ""; then
+	{ { echo "$as_me:$LINENO: error: You are missing f2py" >&5
+echo "$as_me: error: You are missing f2py" >&2;}
+   { (exit 1); exit 1; }; }
+fi
 
 CPPFLAGS="${CPPFLAGS}"
 
@@ -5926,7 +5931,6 @@ LDFLAGS="${LDFLAGS}"
 
 
 
-ac_config_files="$ac_config_files Makefile"
 cat >confcache <<\_ACEOF
 # This file is a shell script that caches the results of configure
 # tests run on this system so they can be shared between configure
@@ -6425,7 +6429,6 @@ do
   case "$ac_config_target" in
   # Handling of arguments.
   "Makefile" ) CONFIG_FILES="$CONFIG_FILES Makefile" ;;
-  "Makefile" ) CONFIG_FILES="$CONFIG_FILES Makefile" ;;
   *) { { echo "$as_me:$LINENO: error: invalid argument: $ac_config_target" >&5
 echo "$as_me: error: invalid argument: $ac_config_target" >&2;}
    { (exit 1); exit 1; }; };;
@@ -6763,6 +6766,9 @@ if test "$no_create" != yes; then
   $ac_cs_success || { (exit 1); exit 1; }
 fi
 
+ac_config_files="$ac_config_files Makefile"
+
+
 
 echo
 echo
diff --git a/configure.ac b/configure.ac
index e33114e20..b072e4cb3 100644
--- a/configure.ac
+++ b/configure.ac
@@ -314,13 +314,18 @@ if test "$portaudio" = yes; then
 	fi
 fi
 
+if test "$F2PY" = ""; then
+	AC_MSG_ERROR([You are missing f2py])
+fi
 
 dnl 
 AC_SUBST(CPPFLAGS, "${CPPFLAGS}")
 AC_SUBST(LDFLAGS, "${LDFLAGS}")
 AC_SUBST(CFLAGS)
 
-AC_OUTPUT([Makefile])
+AC_OUTPUT
+AC_CONFIG_FILES(Makefile)
+
 dnl do summary
 
 echo