if ((source_date_epoch = getenv("SOURCE_DATE_EPOCH")) != NULL) {
if (source_date_epoch[strspn(source_date_epoch, "0123456789")] != '\0') {
pkg_emit_error("Bad environement variable "
pkg_emit_error("Bad environment variable "
"SOURCE_DATE_EPOCH: %s", source_date_epoch);
retcode = EPKG_FATAL;
goto cleanup;