Index: compiler-rt/lib/sanitizer_common/sanitizer_common_interceptors_ioctl.inc
===================================================================
--- compiler-rt/lib/sanitizer_common/sanitizer_common_interceptors_ioctl.inc
+++ compiler-rt/lib/sanitizer_common/sanitizer_common_interceptors_ioctl.inc
@@ -370,6 +370,7 @@
 
 #if SANITIZER_GLIBC
   // _(SIOCDEVPLIP, WRITE, struct_ifreq_sz); // the same as EQL_ENSLAVE
+#if SANITIZER_LINUX_CYCLADES
   _(CYGETDEFTHRESH, WRITE, sizeof(int));
   _(CYGETDEFTIMEOUT, WRITE, sizeof(int));
   _(CYGETMON, WRITE, struct_cyclades_monitor_sz);
@@ -379,6 +380,7 @@
   _(CYSETDEFTIMEOUT, NONE, 0);
   _(CYSETTHRESH, NONE, 0);
   _(CYSETTIMEOUT, NONE, 0);
+#endif
   _(EQL_EMANCIPATE, WRITE, struct_ifreq_sz);
   _(EQL_ENSLAVE, WRITE, struct_ifreq_sz);
   _(EQL_GETMASTRCFG, WRITE, struct_ifreq_sz);
Index: compiler-rt/lib/sanitizer_common/sanitizer_platform.h
===================================================================
--- compiler-rt/lib/sanitizer_common/sanitizer_platform.h
+++ compiler-rt/lib/sanitizer_common/sanitizer_platform.h
@@ -390,4 +390,17 @@
 #define SANITIZER_SUPPORTS_INIT_FOR_DLOPEN 0
 #endif
 
+// Kernel has removed this header, as such check for it's existance
+// before trying to include defines from it.
+// https://lkml.org/lkml/2021/3/2/153
+#ifdef __has_include
+# if __has_include(<linux/cyclades.h>) && !SANITIZER_ANDROID
+#  define SANITIZER_LINUX_CYCLADES 1
+# else
+#  define SANITIZER_LINUX_CYCLADES 0
+# endif
+#else
+#  define SANITIZER_LINUX_CYCLADES 0
+#endif
+
 #endif // SANITIZER_PLATFORM_H
Index: compiler-rt/lib/sanitizer_common/sanitizer_platform_limits_posix.h
===================================================================
--- compiler-rt/lib/sanitizer_common/sanitizer_platform_limits_posix.h
+++ compiler-rt/lib/sanitizer_common/sanitizer_platform_limits_posix.h
@@ -983,7 +983,9 @@
 
 #if SANITIZER_LINUX && !SANITIZER_ANDROID
 extern unsigned struct_ax25_parms_struct_sz;
+#if SANITIZER_LINUX_CYCLADES
 extern unsigned struct_cyclades_monitor_sz;
+#endif
 extern unsigned struct_input_keymap_entry_sz;
 extern unsigned struct_ipx_config_data_sz;
 extern unsigned struct_kbdiacrs_sz;
@@ -1328,6 +1330,7 @@
 #endif  // SANITIZER_LINUX
 
 #if SANITIZER_LINUX && !SANITIZER_ANDROID
+#if SANITIZER_LINUX_CYCLADES
 extern unsigned IOCTL_CYGETDEFTHRESH;
 extern unsigned IOCTL_CYGETDEFTIMEOUT;
 extern unsigned IOCTL_CYGETMON;
@@ -1337,6 +1340,7 @@
 extern unsigned IOCTL_CYSETDEFTIMEOUT;
 extern unsigned IOCTL_CYSETTHRESH;
 extern unsigned IOCTL_CYSETTIMEOUT;
+#endif
 extern unsigned IOCTL_EQL_EMANCIPATE;
 extern unsigned IOCTL_EQL_ENSLAVE;
 extern unsigned IOCTL_EQL_GETMASTRCFG;
Index: compiler-rt/lib/sanitizer_common/sanitizer_platform_limits_posix.cpp
===================================================================
--- compiler-rt/lib/sanitizer_common/sanitizer_platform_limits_posix.cpp
+++ compiler-rt/lib/sanitizer_common/sanitizer_platform_limits_posix.cpp
@@ -143,7 +143,9 @@
 # include <sys/procfs.h>
 #endif
 #include <sys/user.h>
-#include <linux/cyclades.h>
+#if SANITIZER_LINUX_CYCLADES
+# include <linux/cyclades.h>
+#endif
 #include <linux/if_eql.h>
 #include <linux/if_plip.h>
 #include <linux/lp.h>
@@ -460,7 +462,9 @@
 
 #if SANITIZER_GLIBC
   unsigned struct_ax25_parms_struct_sz = sizeof(struct ax25_parms_struct);
+#if SANITIZER_LINUX_CYCLADES
   unsigned struct_cyclades_monitor_sz = sizeof(struct cyclades_monitor);
+#endif
 #if EV_VERSION > (0x010000)
   unsigned struct_input_keymap_entry_sz = sizeof(struct input_keymap_entry);
 #else
@@ -824,6 +828,7 @@
 #endif // SANITIZER_LINUX
 
 #if SANITIZER_LINUX && !SANITIZER_ANDROID
+#if SANITIZER_LINUX_CYCLADES
   unsigned IOCTL_CYGETDEFTHRESH = CYGETDEFTHRESH;
   unsigned IOCTL_CYGETDEFTIMEOUT = CYGETDEFTIMEOUT;
   unsigned IOCTL_CYGETMON = CYGETMON;
@@ -833,6 +838,7 @@
   unsigned IOCTL_CYSETDEFTIMEOUT = CYSETDEFTIMEOUT;
   unsigned IOCTL_CYSETTHRESH = CYSETTHRESH;
   unsigned IOCTL_CYSETTIMEOUT = CYSETTIMEOUT;
+#endif
   unsigned IOCTL_EQL_EMANCIPATE = EQL_EMANCIPATE;
   unsigned IOCTL_EQL_ENSLAVE = EQL_ENSLAVE;
   unsigned IOCTL_EQL_GETMASTRCFG = EQL_GETMASTRCFG;