diff --git a/wdiff.spec b/wdiff.spec
index 37646af..23402ae 100644
--- a/wdiff.spec
+++ b/wdiff.spec
@@ -11,9 +11,10 @@ Source2:        https://ftp.gnu.org/gnu/gnu-keyring.gpg
 
 BuildRequires:  make
 BuildRequires:  automake
+BuildRequires:  autoconf
+BuildRequires:  libtool  
 
 BuildRequires:  gettext-devel
-BuildRequires:  libtool  
 BuildRequires:  texinfo  
 
 BuildRequires:  gnupg2
@@ -46,6 +47,7 @@ rm "${tmp}"
 
 
 %build
+autoreconf -fiv
 %configure --enable-experimental="mdiff wdiff2 unify" 
 %make_build
 
@@ -90,6 +92,7 @@ find '%{buildroot}' -type f -name '*gnulib.mo' -print -delete
 - Fix man page glob
 - Use less broad globs
 - Add ABOUT-NLS, BACKLOG, and THANKS as %%doc files
+- Rebuild configure script at build time
 
 * Wed Jan 27 2021 Fedora Release Engineering <releng@fedoraproject.org> - 1.2.2-16
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_34_Mass_Rebuild