diff --git a/include/crm/common/Makefile.am b/include/crm/common/Makefile.am
index 96fffb8267..381a6a1b33 100644
--- a/include/crm/common/Makefile.am
+++ b/include/crm/common/Makefile.am
@@ -1,51 +1,50 @@
 #
 # Copyright 2004-2024 the Pacemaker project contributors
 #
 # The version control history for this file may have further details.
 #
 # This source code is licensed under the GNU General Public License version 2
 # or later (GPLv2+) WITHOUT ANY WARRANTY.
 #
 
 MAINTAINERCLEANFILES = Makefile.in
 
 headerdir=$(pkgincludedir)/crm/common
 
 header_HEADERS = acl.h 			\
 		 actions.h		\
 		 agents.h 		\
 		 cib.h 			\
 		 ipc.h 			\
 		 ipc_controld.h 	\
 		 ipc_pacemakerd.h 	\
 		 ipc_schedulerd.h 	\
 		 iso8601.h 		\
 		 logging.h 		\
 		 logging_compat.h 	\
 		 mainloop.h 		\
-		 mainloop_compat.h 	\
 		 nodes.h 		\
 		 nvpair.h 		\
 		 options.h 		\
 		 output.h 		\
 		 resources.h		\
 		 results.h 		\
 		 results_compat.h 	\
 		 roles.h		\
 		 rules.h		\
 		 scheduler.h		\
 		 scheduler_types.h	\
 		 schemas.h		\
 		 scores.h		\
 		 scores_compat.h	\
 		 tags.h			\
 		 tickets.h		\
 		 util.h 		\
 		 util_compat.h 		\
 		 xml.h 			\
 		 xml_compat.h		\
 		 xml_io.h		\
 		 xml_io_compat.h	\
 		 xml_names.h
 
 noinst_HEADERS = $(wildcard *internal.h)
diff --git a/include/crm/common/mainloop.h b/include/crm/common/mainloop.h
index 522a945e37..a9c87974a8 100644
--- a/include/crm/common/mainloop.h
+++ b/include/crm/common/mainloop.h
@@ -1,202 +1,198 @@
 /*
  * Copyright 2009-2024 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__CRM_COMMON_MAINLOOP__H
 #define PCMK__CRM_COMMON_MAINLOOP__H
 
 #include <signal.h> // sighandler_t
 #include <glib.h>
 #include <stdbool.h>
 
 #ifdef __cplusplus
 extern "C" {
 #endif
 
 /**
  * \file
  * \brief Wrappers for and extensions to glib mainloop
  * \ingroup core
  */
 
 enum mainloop_child_flags {
     /* don't kill pid group on timeout, only kill the pid */
     mainloop_leave_pid_group = 0x01,
 };
 
 // NOTE: sbd (as of at least 1.5.2) uses this
 typedef struct trigger_s crm_trigger_t;
 
 typedef struct mainloop_io_s mainloop_io_t;
 typedef struct mainloop_child_s mainloop_child_t;
 
 // NOTE: sbd (as of at least 1.5.2) uses this
 typedef struct mainloop_timer_s mainloop_timer_t;
 
 void mainloop_cleanup(void);
 
 // NOTE: sbd (as of at least 1.5.2) uses this
 crm_trigger_t *mainloop_add_trigger(int priority, int (*dispatch) (gpointer user_data),
                                     gpointer userdata);
 
 // NOTE: sbd (as of at least 1.5.2) uses this
 void mainloop_set_trigger(crm_trigger_t * source);
 
 void mainloop_trigger_complete(crm_trigger_t * trig);
 
 gboolean mainloop_destroy_trigger(crm_trigger_t * source);
 
 #ifndef HAVE_SIGHANDLER_T
 typedef void (*sighandler_t)(int);
 #endif
 
 sighandler_t crm_signal_handler(int sig, sighandler_t dispatch);
 
 // NOTE: sbd (as of at least 1.5.2) uses this
 gboolean mainloop_add_signal(int sig, void (*dispatch) (int sig));
 
 gboolean mainloop_destroy_signal(int sig);
 
 bool mainloop_timer_running(mainloop_timer_t *t);
 
 // NOTE: sbd (as of at least 1.5.2) uses this
 void mainloop_timer_start(mainloop_timer_t *t);
 
 // NOTE: sbd (as of at least 1.5.2) uses this
 void mainloop_timer_stop(mainloop_timer_t *t);
 
 guint mainloop_timer_set_period(mainloop_timer_t *t, guint period_ms);
 
 // NOTE: sbd (as of at least 1.5.2) uses this
 mainloop_timer_t *mainloop_timer_add(const char *name, guint period_ms, bool repeat, GSourceFunc cb, void *userdata);
 
 void mainloop_timer_del(mainloop_timer_t *t);
 
 
 #include <crm/common/ipc.h>
 #include <qb/qbipcs.h>
 
 struct ipc_client_callbacks {
     /*!
      * \brief Dispatch function for an IPC connection used as mainloop source
      *
      * \param[in] buffer    Message read from IPC connection
      * \param[in] length    Number of bytes in \p buffer
      * \param[in] userdata  User data passed when creating mainloop source
      *
      * \return Negative value to remove source, anything else to keep it
      */
     int (*dispatch) (const char *buffer, ssize_t length, gpointer userdata);
 
     /*!
      * \brief Destroy function for mainloop IPC connection client data
      *
      * \param[in,out] userdata  User data passed when creating mainloop source
      */
     void (*destroy) (gpointer userdata);
 };
 
 qb_ipcs_service_t *mainloop_add_ipc_server(const char *name, enum qb_ipc_type type,
                                            struct qb_ipcs_service_handlers *callbacks);
 
 /*!
  * \brief Start server-side API end-point, hooked into the internal event loop
  *
  * \param[in] name    name of the IPC end-point ("address" for the client)
  * \param[in] type    selects libqb's IPC back-end (or use #QB_IPC_NATIVE)
  * \param[in] callbacks  defines libqb's IPC service-level handlers
  * \param[in] priority  priority relative to other events handled in the
  *                      abstract handling loop, use #QB_LOOP_MED when unsure
  *
  * \return libqb's opaque handle to the created service abstraction
  *
  * \note For portability concerns, do not use this function if you keep
  *       \p priority as #QB_LOOP_MED, stick with #mainloop_add_ipc_server
  *       (with exactly such semantics) instead (once you link with this new
  *       symbol employed, you can't downgrade the library freely anymore).
  *
  * \note The intended effect will only get fully reflected when run-time
  *       linked to patched libqb: https://github.com/ClusterLabs/libqb/pull/352
  */
 qb_ipcs_service_t *mainloop_add_ipc_server_with_prio(const char *name,
                                                     enum qb_ipc_type type,
                                                     struct qb_ipcs_service_handlers *callbacks,
                                                     enum qb_loop_priority prio);
 
 void mainloop_del_ipc_server(qb_ipcs_service_t * server);
 
 mainloop_io_t *mainloop_add_ipc_client(const char *name, int priority, size_t max_size,
                                        void *userdata, struct ipc_client_callbacks *callbacks);
 
 void mainloop_del_ipc_client(mainloop_io_t * client);
 
 crm_ipc_t *mainloop_get_ipc_client(mainloop_io_t * client);
 
 struct mainloop_fd_callbacks {
     /*!
      * \brief Dispatch function for mainloop file descriptor with data ready
      *
      * \param[in,out] userdata  User data passed when creating mainloop source
      *
      * \return Negative value to remove source, anything else to keep it
      */
     int (*dispatch) (gpointer userdata);
 
     /*!
      * \brief Destroy function for mainloop file descriptor client data
      *
      * \param[in,out] userdata  User data passed when creating mainloop source
      */
     void (*destroy) (gpointer userdata);
 };
 
 mainloop_io_t *mainloop_add_fd(const char *name, int priority, int fd, void *userdata,
                                struct mainloop_fd_callbacks *callbacks);
 
 void mainloop_del_fd(mainloop_io_t * client);
 
 /*
  * Create a new tracked process
  * To track a process group, use -pid
  */
 void mainloop_child_add(pid_t pid,
                         int timeout,
                         const char *desc,
                         void *userdata,
                         void (*callback) (mainloop_child_t * p, pid_t pid, int core, int signo, int exitcode));
 
 void mainloop_child_add_with_flags(pid_t pid,
                         int timeout,
                         const char *desc,
                         void *userdata,
                         enum mainloop_child_flags,
                         void (*callback) (mainloop_child_t * p, pid_t pid, int core, int signo, int exitcode));
 
 void *mainloop_child_userdata(mainloop_child_t * child);
 int mainloop_child_timeout(mainloop_child_t * child);
 const char *mainloop_child_name(mainloop_child_t * child);
 
 pid_t mainloop_child_pid(mainloop_child_t * child);
 void mainloop_clear_child_userdata(mainloop_child_t * child);
 gboolean mainloop_child_kill(pid_t pid);
 
 void pcmk_quit_main_loop(GMainLoop *mloop, unsigned int n);
 void pcmk_drain_main_loop(GMainLoop *mloop, guint timer_ms,
                           bool (*check)(guint));
 
 #define G_PRIORITY_MEDIUM (G_PRIORITY_HIGH/2)
 
-#if !defined(PCMK_ALLOW_DEPRECATED) || (PCMK_ALLOW_DEPRECATED == 1)
-#include <crm/common/mainloop_compat.h>
-#endif
-
 #ifdef __cplusplus
 }
 #endif
 
 #endif
diff --git a/include/crm/common/mainloop_compat.h b/include/crm/common/mainloop_compat.h
deleted file mode 100644
index e4c26f908e..0000000000
--- a/include/crm/common/mainloop_compat.h
+++ /dev/null
@@ -1,33 +0,0 @@
-/*
- * Copyright 2009-2024 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__CRM_COMMON_MAINLOOP_COMPAT__H
-#define PCMK__CRM_COMMON_MAINLOOP_COMPAT__H
-
-#include <glib.h>
-#include <stdbool.h>
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-/**
- * \file
- * \brief Deprecated Pacemaker mainloop API
- * \ingroup core
- * \deprecated Do not include this header directly. The main loop APIs in this
- *             header, and the header itself, will be removed in a future
- *             release.
- */
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif // PCMK__CRM_COMMON_MAINLOOP_COMPAT__H