diff -p -up iml-1.0.2/configure.ac.orig iml-1.0.2/configure.ac
--- iml-1.0.2/configure.ac.orig	2009-03-25 16:33:50.000000000 -0300
+++ iml-1.0.2/configure.ac	2009-03-25 16:34:28.000000000 -0300
@@ -2,9 +2,8 @@ dnl Autoconf
 
 AC_PREREQ(2.59)
 AC_INIT(IML, 1.0.2)
-AC_CONFIG_AUX_DIR(config)
 AM_CONFIG_HEADER(config.h:config-h.in)
-AC_CONFIG_SRCDIR([src/RNSop.c])
+AC_CONFIG_SRCDIR([Makefile.am])
 AM_INIT_AUTOMAKE
 
 # Adds special linker flag for icc
@@ -26,10 +25,6 @@ AC_HEADER_STDC
 AC_DISABLE_SHARED
 AM_PROG_LIBTOOL
 
-DEFAULT_CFLAGS="-O3 -Wall"
-${CFLAGS:=$DEFAULT_CFLAGS}
-CFLAGS="-I. ${CFLAGS}"
-
 AC_CHECK_HEADERS([stdlib.h time.h])
 
 AC_CHECK_HEADERS([math.h],, [echo 'error: could not find required header math.h, configuration aborted.'  exit 1])
@@ -45,20 +40,80 @@ AC_CHECK_FUNCS(bzero memset, break)
 
 AC_CHECK_FUNCS(calloc floor)
 
-IML_VERBOSE_MODE
-IML_DEFAULT_PATH
-IML_CHECK_GMP(,,[AC_MSG_ERROR(
-GMP not found! 
-GMP version 3.1.1 or greater is required for this library to compile. 
-Please make sure GMP is installed and specify the header and libraries 
-location with the options --with-gmp-include=<path> and --with-gmp-lib=<path>
-respectively when running configure.
-)])
-
-IML_CHECK_ATLAS(,,[AC_MSG_ERROR(
-ATLAS not found! 
-ATLAS version 3.0 or greater is required for this library to compile. Please make sure ATLAS is installed and specify the header and libraries location with the options --with-atlas-include=<path> and --with-atlas-lib=<path> respectively when running configure.
-)])
+AC_ARG_ENABLE(verbose-mode,
+    [ --enable-verbose-mode
+    The program will output additional information such as
+    timings, intermidate results and so on.],
+    [AC_DEFINE([HAVE_VERBOSE_MODE], [1], [make verbose output])],
+    [])
+
+AC_ARG_WITH(default,
+    [ --with-default=<path>
+    Add <path> to the default path for package GMP and
+    ATLAS searching. The default path without setting this
+    argument is /usr and /usr/local],
+    [DEFAULT_PATH="$withval"],
+    [DEFAULT_PATH="/usr"])
+
+#=========================================================================
+AC_ARG_WITH(gmp-include,
+    [ --with-gmp-include=<path>
+    Specify the path of GMP header gmp.h
+    If argument is <empty> that means the header is reachable
+    with the default search path: /usr/include or /usr/local/include
+    or other path you add as default path using --with-default.
+    Otherwise you give the <path> to the directory which contains
+    the header gmp.h.],
+    [GMP_HEADER_PATH=$withval],
+    [GMP_HEADER_PATH="${DEFAULT_PATH}/include"])
+
+AC_ARG_WITH(gmp-lib,
+    [ --with-gmp-lib=<path>
+    Specify the path of GMP library.
+    If argument is <empty> that means the header is reachable
+    with the default search path: /usr/include or /usr/local/include
+    or path you add as default path using --with-default.
+    Otherwise you give the <path> to the directory which contains
+    the GMP library.],
+    [GMP_LIBRARY_PATH=$withval],
+    [GMP_LIBRARY_PATH="${DEFAULT_PATH}/lib"])
+
+GMP_CFLAGS="-I${GMP_HEADER_PATH}"
+GMP_LIBS="-L${GMP_LIBRARY_PATH} -lgmp"
+AC_SUBST(GMP_CFLAGS)
+AC_SUBST(GMP_LIBS)
+#-------------------------------------------------------------------------
+
+
+#=========================================================================
+AC_ARG_WITH(atlas-include,
+    [ --with-atlas-include=<path>
+    Specify the path of ATLAS header cblas.h
+    If argument is <empty> that means the header is reachable
+    with the default search path: /usr/include or /usr/local/include
+    or other path you add as default path using --with-default.
+    Otherwise you give the <path> to the directory which contains
+    the ATLAS header cblas.h.],
+    [ATLAS_HEADER_PATH=$withval],
+    [ATLAS_HEADER_PATH="${DEFAULT_PATH}/include"])
+
+AC_ARG_WITH(atlas-lib,
+    [ --with-atlas-lib=<path>
+    Specify the path of ATLAS library.
+    If argument is <empty> that means the header is reachable
+    with the default search path: /usr/include or /usr/local/include
+    or path you add as default path using --with-default.
+    Otherwise you give the <path> to the directory which contains
+    the ATLAS library.],
+    [ATLAS_LIBRARY_PATH=$withval],
+    [ATLAS_LIBRARY_PATH="${DEFAULT_PATH}/lib"])
+
+ATLAS_CFLAGS="-I${ATLAS_HEADER_PATH}"
+ATLAS_LIBS="-L${ATLAS_LIBRARY_PATH} -lcblas -latlas"
+AC_SUBST(ATLAS_CFLAGS)
+AC_SUBST(ATLAS_LIBS)
+#-------------------------------------------------------------------------
+
 
 AC_SUBST(LDFLAGS)
 AC_SUBST(ac_aux_dir)
--- iml-1.0.2/src/Makefile.am.orig	2009-03-25 16:34:57.000000000 -0300
+++ iml-1.0.2/src/Makefile.am	2009-03-25 16:35:00.000000000 -0300
@@ -1,6 +1,6 @@
-AM_CFLAGS = $(GMP_CFLAGS) $(ATLAS_CFLAGS)
+AM_CFLAGS = @GMP_CFLAGS@ @ATLAS_CFLAGS@
 
-EXTERNLIB = $(GMP_LIBS) $(ATLAS_LIBS) 
+EXTERNLIB = @GMP_LIBS@ @ATLAS_LIBS@
 
 include_HEADERS = iml.h
 
diff -p -up iml-1.0.2/tests/Makefile.am.orig iml-1.0.2/tests/Makefile.am
--- iml-1.0.2/tests/Makefile.am.orig	2009-03-25 16:35:37.000000000 -0300
+++ iml-1.0.2/tests/Makefile.am	2009-03-25 16:35:52.000000000 -0300
@@ -1,6 +1,6 @@
-AM_CFLAGS = -I/$(top_srcdir)/src  $(GMP_CFLAGS) $(ATLAS_CFLAGS)
+AM_CFLAGS = -I/$(top_srcdir)/src  @GMP_CFLAGS@ @ATLAS_CFLAGS@
 
-TESTLIB = $(top_builddir)/src/libiml.la $(ATLAS_LIBS) $(GMP_LIBS)
+TESTLIB = $(top_builddir)/src/libiml.la @ATLAS_LIBS@ @GMP_LIBS@
 
 TESTS = test-smallentry$(EXEEXT) test-largeentry$(EXEEXT)