diff --git a/virt-what.spec b/virt-what.spec
index 1eea3bf..1e08841 100644
--- a/virt-what.spec
+++ b/virt-what.spec
@@ -20,6 +20,7 @@ Patch0008:      0008-Simplify-and-fix-invocation-of-cpuid.patch
 
 BuildRequires:  make
 BuildRequires:  git
+BuildRequires:  autoconf, automake, libtool
 
 # This is provided by the build root, but we make it explicit
 # anyway in case this was dropped from the build root in future.
@@ -94,6 +95,9 @@ Current types of virtualization detected:
 #%%autosetup -S git
 %autosetup -S git -n %{name}-1.20
 
+# Always rebuild upstream autotools files.
+autoreconf -i
+
 
 %build
 %configure