Fix configure.ac
* Remove setting CFLAGS
* Look for sqrt() in libm (bug 592414)

--- a/configure.in
+++ b/configure.in
@@ -1,26 +1,23 @@
 AC_PREREQ(2.52)
 
-AC_INIT(sirius, 0.8.0)
-AC_CONFIG_SRCDIR(src/sirius.c)
-AM_INIT_AUTOMAKE(AC_PACKAGE_NAME, AC_PACKAGE_VERSION)
+AC_INIT([sirius], [0.8.0])
+AC_CONFIG_SRCDIR([src/sirius.c])
+AM_INIT_AUTOMAKE
 
-AM_CONFIG_HEADER(config.h)
-
-AM_MAINTAINER_MODE
+AC_CONFIG_HEADERS([config.h])
 
 AC_PROG_INTLTOOL
 
-AC_ISC_POSIX
 AC_PROG_CC
-AC_STDC_HEADERS
-AM_PROG_LIBTOOL
-AC_PROG_LIBTOOL
+LT_INIT
 
 pkg_modules="gtk+-2.0 >= 1.3.13 gconf-2.0 libgnomeui-2.0 libgnomecanvas-2.0 libgnomeui-2.0 gdk-pixbuf-2.0"
 PKG_CHECK_MODULES(PACKAGE, [$pkg_modules])
-AC_SUBST(PACKAGE_CFLAGS)
-AC_SUBST(PACKAGE_LIBS)
 
+dnl Look for sqrt() in libm
+AC_SEARCH_LIBS([sqrt], [m], [], [
+	AC_MSG_ERROR([unable to find the sqrt() function])
+])
 
 GETTEXT_PACKAGE=sirius
 AC_DEFINE_UNQUOTED(GETTEXT_PACKAGE,"$GETTEXT_PACKAGE")
@@ -29,22 +26,6 @@
 ALL_LINGUAS="sv fr de ru"
 AM_GLIB_GNU_GETTEXT
 
-CFLAGS="-g -O3"
-
-AC_SUBST(CFLAGS)
-AC_SUBST(CPPFLAGS)
-AC_SUBST(LDFLAGS) 
-
-dnl Use -Wall if we have gcc.
-changequote(,)dnl
-if test "x$GCC" = "xyes"; then
-  case " $CFLAGS " in
-  *[\ \	]-Wall[\ \	]*) ;;
-  *) CFLAGS="$CFLAGS -Wall" ;;
-  esac
-fi
-changequote([,])dnl
-
 AC_OUTPUT([
 Makefile
 po/Makefile.in