https://bugs.gentoo.org/961205
https://trac.ffmpeg.org/ticket/11570
https://github.com/FFmpeg/FFmpeg/commit/5fea5e3e11d6
--- a/configure
+++ b/configure
@@ -2524,3 +2524,3 @@
     pod2man
-    posix_ioctl
+    ioctl_posix
     texi2html
@@ -7183,3 +7183,3 @@
 test_code cc linux/videodev2.h "struct v4l2_frmsizeenum vfse; vfse.discrete.width = 0;" && enable_sanitized struct_v4l2_frmivalenum_discrete
-test_code cc sys/ioctl.h "int ioctl(int, int, ...)" && enable posix_ioctl
+test_code cc sys/ioctl.h "int ioctl(int, int, ...)" && enable ioctl_posix
 
--- a/libavdevice/v4l2.c
+++ b/libavdevice/v4l2.c
@@ -113,3 +113,3 @@
     int (*dup_f)(int fd);
-#if HAVE_POSIX_IOCTL
+#if HAVE_IOCTL_POSIX
     int (*ioctl_f)(int fd, int request, ...);