https://build.opensuse.org/package/view_file/openSUSE:13.1/checkinstall/checkinstall-set_buildroot.patch

Index: checkinstall
===================================================================
--- a/checkinstall	2009-12-26 20:17:24.000000000 +0100
+++ b/checkinstall	2011-01-31 18:17:56.171593541 +0100
@@ -2463,7 +2463,7 @@ cd "$DIRECTORIO_FUENTE"
 
 echo
 echogn "Building RPM package..."
-$RPMBUILD -bb ${RPM_TARGET_FLAG}${ARCHITECTURE} "$SPEC_PATH" &> ${TMP_DIR}/rpmbuild.log
+$RPMBUILD --buildroot ${BUILDROOT} -bb ${RPM_TARGET_FLAG}${ARCHITECTURE} "$SPEC_PATH" &> ${TMP_DIR}/rpmbuild.log
 okfail
 
 if [ $? -gt 0 ]; then