diff --git a/configure.ac b/configure.ac
--- a/configure.ac
+++ b/configure.ac
@@ -2,14 +2,17 @@
 
 dnl Version information.
 m4_define([lemon_version_number],
-	[m4_normalize(esyscmd([echo ${LEMON_VERSION}]))])
+          [m4_normalize(esyscmd([echo ${LEMON_VERSION}]))])
 dnl m4_define([lemon_version_number], [])
 m4_define([lemon_hg_path], [m4_normalize(esyscmd([./scripts/chg-len.py]))])
-m4_define([lemon_hg_revision], [m4_normalize(esyscmd([hg id -i]))])
+m4_define([lemon_hg_revision], [m4_normalize(esyscmd([hg id -i 2> /dev/null]))])
 m4_define([lemon_version], [ifelse(lemon_version_number(),
-			   [],
-			   [lemon_hg_path().lemon_hg_revision()],
-			   [lemon_version_number()])])
+                           [],
+                           [ifelse(lemon_hg_revision(),
+                           [],
+                           [hg-tip],
+                           [lemon_hg_path().lemon_hg_revision()])],
+                           [lemon_version_number()])])
 
 AC_PREREQ([2.59])
 AC_INIT([LEMON], [lemon_version()], [lemon-user@lemon.cs.elte.hu], [lemon])
@@ -19,7 +22,7 @@
 AC_CONFIG_SRCDIR([lemon/list_graph.h])
 AC_CONFIG_HEADERS([config.h lemon/config.h])
 
-lx_cmdline_cxxflags_set=${CXXFLAGS+set}
+AC_DEFINE([LEMON_VERSION], [lemon_version()], [The version string])
 
 dnl Do compilation tests using the C++ compiler.
 AC_LANG([C++])
@@ -38,6 +41,7 @@
 AC_PROG_LIBTOOL
 
 AC_CHECK_PROG([doxygen_found],[doxygen],[yes],[no])
+AC_CHECK_PROG([python_found],[python],[yes],[no])
 AC_CHECK_PROG([gs_found],[gs],[yes],[no])
 
 dnl Detect Intel compiler.
@@ -52,27 +56,19 @@
 fi
 
 dnl Set custom compiler flags when using g++.
-if test x"$lx_cmdline_cxxflags_set" != x"set" -a "$GXX" = yes -a "$ICC" = no; then
-  CXXFLAGS="$CXXFLAGS -Wall -W -Wall -W -Wunused -Wformat=2 -Wctor-dtor-privacy -Wnon-virtual-dtor -Wno-char-subscripts -Wwrite-strings -Wno-char-subscripts -Wreturn-type -Wcast-qual -Wcast-align -Wsign-promo -Woverloaded-virtual -Woverloaded-virtual -ansi -fno-strict-aliasing -Wold-style-cast -Wno-unknown-pragmas"
+if test "$GXX" = yes -a "$ICC" = no; then
+  WARNINGCXXFLAGS="-Wall -W -Wall -W -Wunused -Wformat=2 -Wctor-dtor-privacy -Wnon-virtual-dtor -Wno-char-subscripts -Wwrite-strings -Wno-char-subscripts -Wreturn-type -Wcast-qual -Wcast-align -Wsign-promo -Woverloaded-virtual -ansi -fno-strict-aliasing -Wold-style-cast -Wno-unknown-pragmas"
 fi
+AC_SUBST([WARNINGCXXFLAGS])
 
 dnl Checks for libraries.
-#LX_CHECK_GLPK
-#LX_CHECK_CPLEX
-#LX_CHECK_SOPLEX
+LX_CHECK_GLPK
+LX_CHECK_CPLEX
+LX_CHECK_SOPLEX
+LX_CHECK_COIN
 
-dnl Disable/enable building the demo programs.
-AC_ARG_ENABLE([demo],
-AS_HELP_STRING([--enable-demo], [build the demo programs])
-AS_HELP_STRING([--disable-demo], [do not build the demo programs @<:@default@:>@]),
-              [], [enable_demo=no])
-AC_MSG_CHECKING([whether to build the demo programs])
-if test x"$enable_demo" != x"no"; then
-  AC_MSG_RESULT([yes])
-else
-  AC_MSG_RESULT([no])
-fi
-AM_CONDITIONAL([WANT_DEMO], [test x"$enable_demo" != x"no"])
+AM_CONDITIONAL([HAVE_LP], [test x"$lx_lp_found" = x"yes"])
+AM_CONDITIONAL([HAVE_MIP], [test x"$lx_mip_found" = x"yes"])
 
 dnl Disable/enable building the binary tools.
 AC_ARG_ENABLE([tools],
@@ -107,6 +103,7 @@
 
 AC_CONFIG_FILES([
 Makefile
+demo/Makefile
 cmake/version.cmake
 doc/Doxyfile
 lemon/lemon.pc
@@ -120,15 +117,16 @@
 echo Package version............... : $PACKAGE-$VERSION
 echo
 echo C++ compiler.................. : $CXX
-echo C++ compiles flags............ : $CXXFLAGS
+echo C++ compiles flags............ : $WARNINGCXXFLAGS $CXXFLAGS
 echo
 echo Compiler supports long long... : $long_long_found
 echo
-#echo GLPK support.................. : $lx_glpk_found
-#echo CPLEX support................. : $lx_cplex_found
-#echo SOPLEX support................ : $lx_soplex_found
-#echo
-echo Build demo programs........... : $enable_demo
+echo GLPK support.................. : $lx_glpk_found
+echo CPLEX support................. : $lx_cplex_found
+echo SOPLEX support................ : $lx_soplex_found
+echo CLP support................... : $lx_clp_found
+echo CBC support................... : $lx_cbc_found
+echo
 echo Build additional tools........ : $enable_tools
 echo
 echo The packace will be installed in