diff --git a/qemu-sanity-check.spec b/qemu-sanity-check.spec
index 59eca76..cd8a465 100644
--- a/qemu-sanity-check.spec
+++ b/qemu-sanity-check.spec
@@ -85,7 +85,10 @@ autoreconf -i
 %build
 # NB: canonical_arch is a variable in the final script, so it
 # has to be escaped here.
-%configure --with-qemu-list="qemu-system-\$canonical_arch"
+%configure --with-qemu-list="qemu-system-\$canonical_arch" || {
+  cat config.log
+  exit 1
+}
 make %{?_smp_mflags}