diff --git a/include/crm/common/options_internal.h b/include/crm/common/options_internal.h
index fa2ae24ce4..a18680d2aa 100644
--- a/include/crm/common/options_internal.h
+++ b/include/crm/common/options_internal.h
@@ -1,122 +1,135 @@
 /*
  * Copyright 2006-2021 the Pacemaker project contributors
  *
  * The version control history for this file may have further details.
  *
  * This source code is licensed under the GNU Lesser General Public License
  * version 2.1 or later (LGPLv2.1+) WITHOUT ANY WARRANTY.
  */
 
 #ifndef PCMK__OPTIONS_INTERNAL__H
 #  define PCMK__OPTIONS_INTERNAL__H
 
 #  ifndef PCMK__CONFIG_H
 #    define PCMK__CONFIG_H
 #    include <config.h>   // HAVE_GETOPT, _Noreturn
 #  endif
 
 #  include <glib.h>     // GHashTable
 #  include <stdbool.h>  // bool
 
 /*
  * Command-line option handling
  *
  * This will all eventually go away as everything is converted to use GOption
  */
 
 #  ifdef HAVE_GETOPT_H
 #    include <getopt.h>
 #  else
 #    define no_argument 0
 #    define required_argument 1
 #  endif
 
 enum pcmk__cli_option_flags {
     pcmk__option_default    = (1 << 0),
     pcmk__option_hidden     = (1 << 1),
     pcmk__option_paragraph  = (1 << 2),
     pcmk__option_example    = (1 << 3),
 };
 
 typedef struct pcmk__cli_option_s {
     /* Fields from 'struct option' in getopt.h */
     /* name of long option */
     const char *name;
     /*
      * one of no_argument, required_argument, and optional_argument:
      * whether option takes an argument
      */
     int has_arg;
     /* if not NULL, set *flag to val when option found */
     int *flag;
     /* if flag not NULL, value to set *flag to; else return value */
     int val;
 
     /* Custom fields */
     const char *desc;
     long flags;
 } pcmk__cli_option_t;
 
 void pcmk__set_cli_options(const char *short_options, const char *usage,
                            pcmk__cli_option_t *long_options,
                            const char *app_desc);
 int pcmk__next_cli_option(int argc, char **argv, int *index,
                           const char **longname);
 _Noreturn void pcmk__cli_help(char cmd, crm_exit_t exit_code);
 void pcmk__cli_option_cleanup(void);
 
 
 /*
  * Environment variable option handling
  */
 
 const char *pcmk__env_option(const char *option);
 void pcmk__set_env_option(const char *option, const char *value);
 bool pcmk__env_option_enabled(const char *daemon, const char *option);
 
 
 /*
  * Cluster option handling
  */
 
 typedef struct pcmk__cluster_option_s {
     const char *name;
     const char *alt_name;
     const char *type;
     const char *values;
     const char *default_value;
 
     bool (*is_valid)(const char *);
 
     const char *description_short;
     const char *description_long;
 
 } pcmk__cluster_option_t;
 
 const char *pcmk__cluster_option(GHashTable *options,
                                  pcmk__cluster_option_t *option_list, int len,
                                  const char *name);
 
 void pcmk__print_option_metadata(const char *name, const char *version,
                                  const char *desc_short, const char *desc_long,
                                  pcmk__cluster_option_t *option_list, int len);
 
 void pcmk__validate_cluster_options(GHashTable *options,
                                     pcmk__cluster_option_t *option_list,
                                     int len);
 
 bool pcmk__valid_interval_spec(const char *value);
 bool pcmk__valid_boolean(const char *value);
 bool pcmk__valid_number(const char *value);
 bool pcmk__valid_positive_number(const char *value);
 bool pcmk__valid_quorum(const char *value);
 bool pcmk__valid_script(const char *value);
 bool pcmk__valid_utilization(const char *value);
 
 // from watchdog.c
 long pcmk__get_sbd_timeout(void);
 bool pcmk__get_sbd_sync_resource_startup(void);
 long pcmk__auto_watchdog_timeout(void);
 bool pcmk__valid_sbd_timeout(const char *value);
 
+// constants for environment variable names
+#define PCMK__ENV_CLUSTER_TYPE "cluster_type"
+#define PCMK__ENV_QUORUM_TYPE "quorum_type"
+#define PCMK__ENV_DEBUG "debug"
+#define PCMK__ENV_LOGFILE "logfile"
+#define PCMK__ENV_LOGFACILITY "logfacility"
+#define PCMK__ENV_SHUTDOWN_DELAY "shutdown_delay"
+#define PCMK__ENV_NODE_START_STATE "node_start_state"
+#define PCMK__ENV_MCP "mcp"
+#define PCMK__ENV_LOGPRIORITY "logpriority"
+#define PCMK__ENV_STDERR "stderr"
+#define PCMK__ENV_BLACKBOX "blackbox"
+
 #endif // PCMK__OPTIONS_INTERNAL__H