https://bugs.gentoo.org/983364
https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/5656e9e5ab6
--- a/libavcodec/tests/x86/dct.c
+++ b/libavcodec/tests/x86/dct.c
@@ -29,4 +29,4 @@
 #if CONFIG_PRORES_DECODER && ARCH_X86_64 && HAVE_X86ASM
-void ff_prores_idct_put_10_sse2(uint16_t *dst, int linesize,
-                                int16_t *block, int16_t *qmat);
+void ff_prores_idct_put_10_sse2(uint16_t *dst, ptrdiff_t linesize,
+                                int16_t *block, const int16_t *qmat);
 
@@ -52,4 +52,4 @@
 # if HAVE_AVX_EXTERNAL
-void ff_prores_idct_put_10_avx(uint16_t *dst, int linesize,
-                               int16_t *block, int16_t *qmat);
+void ff_prores_idct_put_10_avx(uint16_t *dst, ptrdiff_t linesize,
+                               int16_t *block, const int16_t *qmat);
 PR_WRAP(avx)