diff -ru libcaca.orig/caca/caca_internals.h libcaca/caca/caca_internals.h
--- libcaca.orig/caca/caca_internals.h	2025-05-17 18:51:29.520730829 +0200
+++ libcaca/caca/caca_internals.h	2025-05-17 19:12:43.545698624 +0200
@@ -268,7 +268,7 @@
 extern void _caca_set_term_title(char const *);
 
 /* Internal memory function */
-extern void *_caca_alloc2d(size_t width, size_t height, size_t elem_size);
+__extern void *_caca_alloc2d(size_t width, size_t height, size_t elem_size);
 
 /* Profiling functions */
 #if defined PROF
diff -ru libcaca.orig/src/common-image.c libcaca/src/common-image.c
--- libcaca.orig/src/common-image.c	2025-05-17 19:13:21.294381185 +0200
+++ libcaca/src/common-image.c	2025-05-17 19:07:40.885404413 +0200
@@ -22,6 +22,7 @@
 #endif
 
 #include "caca.h"
+#include "caca_internals.h"
 
 #include "common-image.h"