Index: head/multimedia/libvpx/files/patch-vpx__ports_arm__cpudetect.c
===================================================================
--- head/multimedia/libvpx/files/patch-vpx__ports_arm__cpudetect.c	(revision 451606)
+++ head/multimedia/libvpx/files/patch-vpx__ports_arm__cpudetect.c	(revision 451607)
@@ -1,60 +1,63 @@
 --- vpx_ports/arm_cpudetect.c.orig	2017-01-12 20:27:27 UTC
 +++ vpx_ports/arm_cpudetect.c
-@@ -147,6 +147,57 @@ int arm_cpu_caps(void) {
+@@ -147,6 +147,60 @@ int arm_cpu_caps(void) {
    }
    return flags & mask;
  }
 +#elif defined(__FreeBSD__)
 +
 +#if __has_include(<sys/auxv.h>)
 +#include <sys/auxv.h>
 +#else
 +#include <sys/param.h>
 +#include <sys/sysctl.h>
 +#include <elf.h>
++#include <errno.h>
 +#include <unistd.h>
 +
 +static unsigned long getauxval(unsigned long type) {
 +  Elf_Auxinfo auxv[AT_COUNT];
 +  size_t len = sizeof(auxv);
 +  int mib[] = {
 +    CTL_KERN,
 +    KERN_PROC,
 +    KERN_PROC_AUXV,
 +    getpid(),
 +  };
 +
 +  if (sysctl(mib, nitems(mib), auxv, &len, NULL, 0) != -1) {
 +    for (size_t i = 0; i < nitems(auxv); i++)
 +      if ((unsigned long)auxv[i].a_type == type)
 +        return auxv[i].a_un.a_val;
++
++    errno = ENOENT;
 +  }
 +  return 0;
 +}
 +#endif
 +
 +#ifndef AT_HWCAP
 +#define AT_HWCAP 25 /* 16 on Linux */
 +#endif
 +
 +#ifndef HWCAP_NEON
 +#define HWCAP_NEON (1 << 12)
 +#endif
 +
 +int arm_cpu_caps(void) {
 +  int flags;
 +  int mask;
 +  unsigned long hwcaps;
 +  if (!arm_cpu_env_flags(&flags)) {
 +    return flags;
 +  }
 +  mask = arm_cpu_env_mask();
 +  hwcaps = getauxval(AT_HWCAP);
 +#if HAVE_NEON || HAVE_NEON_ASM
 +  if (hwcaps & HWCAP_NEON) flags |= HAS_NEON;
 +#endif
 +  return flags & mask;
 +}
  #else  /* end __linux__ */
  #error \
      "--enable-runtime-cpu-detect selected, but no CPU detection method " \