diff --git a/bc.spec b/bc.spec
index c8ef50c..3e80f3d 100644
--- a/bc.spec
+++ b/bc.spec
@@ -9,6 +9,7 @@ Source: ftp://ftp.gnu.org/gnu/bc/bc-%{version}.tar.bz2
 Patch1: bc-1.06-readline42.patch
 Patch2: bc-1.06-s390.patch
 Patch3: bc-1.06-info_exp_bessel.patch
+Patch4: bc-1.06-flex.patch
 Requires(post): /sbin/install-info grep mktemp
 Requires(preun): /sbin/install-info
 Buildroot: %{_tmppath}/%{name}-%{version}-%{release}-root-%(%{__id_u} -n)
@@ -28,8 +29,11 @@ if you would like to use its text mode calculator.
 %patch1 -p1 -b .rl22
 %patch2 -p1 -b .s390
 %patch3 -p1 -b .info_exp_bessel
+%patch4 -p1 -b .flexparameter
 
 %build
+aclocal
+automake -f --add-missing
 autoconf
 %configure --with-readline
 make %{?_smp_mflags}
@@ -76,6 +80,8 @@ exit 0
 - use make install DESTDIR=...
 - convert changelog to utf-8
 - use smp flags
+- use 'flex -I' instead 'flex -I8' (not supported anymore)
+- run autofoo stuff to update files for current automake
 
 * Tue Jan 23 2007 Florian La Roche <laroche@redhat.com>
 - scripts should never fail: rhbz#223677