+From https://github.com/FFTW/fftw3/issues/73
+
+diff --git a/configure.ac b/configure.ac
+index 83a295f..51d290a 100644
+--- a/configure.ac
++++ b/configure.ac
+@@ -212,11 +212,21 @@ if test "$have_neon" = "yes"; then
+ fi
+ AM_CONDITIONAL(HAVE_NEON, test "$have_neon" = "yes")
+
+-AC_ARG_ENABLE(armv8cyclecounter, [AC_HELP_STRING([--enable-armv8cyclecounter],[enable the cycle counter on ARMv8 ; require enabling in kernel mode, see <https://github.com/rdolbeau/enable_arm_pmu>])], have_armv8cyclecounter=$enableval)
++AC_ARG_ENABLE(armv8cyclecounter, [AC_HELP_STRING([--enable-armv8cyclecounter],[enable the cycle counter on ARMv8 via the PMCCNTR_EL0 register. Requires enabling in kernel mode, see <https://github.com/rdolbeau/enable_arm_pmu>])], have_armv8cyclecounter=$enableval)
+ if test "$have_armv8cyclecounter"x = "yes"x; then
+ AC_DEFINE(HAVE_ARMV8CC,1,[Define if you have enabled the cycle counter on ARMv8])
+ fi
+
++AC_ARG_ENABLE(armv8-cntvct-el0, [AC_HELP_STRING([--enable-armv8-cntvct-el0],[enable the cycle counter on ARMv8 via the CNTVCT_EL0 register])], have_armv8cntvctel0=$enableval)
++if test "$have_armv8cntvctel0"x = "yes"x; then
++ AC_DEFINE(HAVE_ARMV8_CNTVCT_EL0,1,[Define if you have enabled the CNTVCT_EL0 cycle counter on ARMv8])
++fi
++
++AC_ARG_ENABLE(armv7a-cntvct, [AC_HELP_STRING([--enable-armv7a-cntvct],[enable the cycle counter on Armv7a via the CNTVCT register])], have_armv7acntvct=$enableval)
++if test "$have_armv7acntvct"x = "yes"x; then
++ AC_DEFINE(HAVE_ARMV7A_CNTVCT,1,[Define if you have enabled the CNTVCT cycle counter on ARMv7a])
++fi
++
+ AC_ARG_ENABLE(generic-simd128, [AC_HELP_STRING([--enable-generic-simd128],[enable generic (gcc) 128-bit SIMD optimizations])], have_generic_simd128=$enableval, have_generic_simd128=no)
+ if test "$have_generic_simd128" = "yes"; then
+ AC_DEFINE(HAVE_GENERIC_SIMD128,1,[Define to enable generic (gcc) 128-bit SIMD optimizations.])
+@@ -719,36 +729,6 @@ AM_CONDITIONAL(OPENMP, test "$enable_openmp" = "yes")
+ AM_CONDITIONAL(SMP, test "$enable_threads" = "yes" -o "$enable_openmp" = "yes")
+ AM_CONDITIONAL(COMBINED_THREADS, test x"$with_combined_threads" = xyes)
+
+-
+-dnl -----------------------------------------------------------------------
+-dnl Check for not-always-available (not quite) cycle counters
+-case "${host_cpu}" in
+- armv7*)
+- AC_MSG_CHECKING([armv7a has 64 bits readable CNTVCT])
+- AC_RUN_IFELSE(
+- [AC_LANG_PROGRAM([[#include <stdint.h>]],
+- [[uint32_t Rt, Rt2 = 0;asm volatile("mrrc p15, 1, %0, %1, c14" : "=r"(Rt), "=r"(Rt2));]]
+- )],
+- [AC_DEFINE(ARMV7A_HAS_CNTCVT,1,[Define if CNTVCT is 64 bits readable on armv7a ])
+- AC_MSG_RESULT([yes])],
+- [AC_MSG_RESULT([no])]
+- )
+- ;;
+- aarch64)
+- AC_MSG_CHECKING([armv8 has 64 bits readable CNTVCT_EL0])
+- AC_RUN_IFELSE(
+- [AC_LANG_PROGRAM([[#include <stdint.h>]],
+- [[uint64_t Rt;asm volatile("mrs %0, CNTVCT_EL0" : "=r" (Rt));]]
+- )],
+- [AC_DEFINE(ARMV8_HAS_CNTCVT_EL0,1,[Define if CNTVCT_EL0 is 64 bits readable on armv8 ])
+- AC_MSG_RESULT([yes])],
+- [AC_MSG_RESULT([no])]
+- )
+- ;;
+- *)
+- ;;
+-esac
+-
+ dnl -----------------------------------------------------------------------
+
+ AC_MSG_CHECKING([whether a cycle counter is available])
+diff --git a/kernel/cycle.h b/kernel/cycle.h
+index 873e92e..781792c 100644
+--- a/kernel/cycle.h
++++ b/kernel/cycle.h
+@@ -515,7 +515,7 @@ INLINE_ELAPSED(inline)
+ #endif
+ #endif /* HAVE_MIPS_ZBUS_TIMER */
+
+-#if defined(__ARM_ARCH_7A__) && defined(ARMV7A_HAS_CNTCVT)
++#if defined(__ARM_ARCH_7A__) && defined(ARMV7A_HAS_CNTVCT)
+ typedef uint64_t ticks;
+ static inline ticks getticks(void)
+ {
+@@ -527,7 +527,7 @@ INLINE_ELAPSED(inline)
+ #define HAVE_TICK_COUNTER
+ #endif
+
+-#if defined(__aarch64__) && defined(ARMV8_HAS_CNTCVT_EL0) && !defined(HAVE_ARMV8CC)
++#if defined(__aarch64__) && defined(HAVE_ARMV8_CNTVCT_EL0) && !defined(HAVE_ARMV8CC)
+ typedef uint64_t ticks;
+ static inline ticks getticks(void)
+ {