https://github.com/cacalabs/libcaca/commit/e4968ba6e93e9fd35429eb16895c785c51072015.patch
Patch adjusted to remove the lines modifying caca/t/canvas.cpp. This file does not exist in the current release.

From e4968ba6e93e9fd35429eb16895c785c51072015 Mon Sep 17 00:00:00 2001
From: Sam Hocevar <sam@hocevar.net>
Date: Fri, 26 Feb 2021 12:40:06 +0100
Subject: [PATCH] Fix a problem in the caca_resize() overflow detection and add
 several unit tests.

---
 caca/canvas.c     | 16 ++++++++--------
 caca/t/canvas.cpp | 18 +++++++++++++++---
 tools/makefont.c  | 22 +++++++++++++++++++---
 3 files changed, 42 insertions(+), 14 deletions(-)

diff --git a/caca/canvas.c b/caca/canvas.c
index d0715392..08c628c9 100644
--- a/caca/canvas.c
+++ b/caca/canvas.c
@@ -367,6 +367,14 @@ int caca_resize(caca_canvas_t *cv, int width, int height)
 {
     int x, y, f, old_width, old_height, old_size;
 
+    /* Check for overflow */
+    int new_size = width * height;
+    if (new_size < 0 || (width > 0 && new_size / width != height))
+    {
+        seterrno(EOVERFLOW);
+        return -1;
+    }
+
     old_width = cv->width;
     old_height = cv->height;
     old_size = old_width * old_height;
@@ -377,14 +385,6 @@ int caca_resize(caca_canvas_t *cv, int width, int height)
      * dirty rectangle handling */
     cv->width = width;
     cv->height = height;
-    int new_size = width * height;
-
-    /* Check for overflow */
-    if (new_size / width != height)
-    {
-        seterrno(EOVERFLOW);
-        return -1;
-    }
 
     /* If width or height is smaller (or both), we have the opportunity to
      * reduce or even remove dirty rectangles */
diff --git a/tools/makefont.c b/tools/makefont.c
index 226c8838..66718605 100644
--- a/tools/makefont.c
+++ b/tools/makefont.c
@@ -40,7 +40,8 @@
  * and the UTF-8 glyphs necessary for canvas rotation and mirroring. */
 static unsigned int const blocklist[] =
 {
-    0x0000, 0x0080, /* Basic latin: A, B, C, a, b, c */
+    0x0020, 0x0080, /* Basic latin: A, B, C, a, b, c */
+#if 0
     0x0080, 0x0100, /* Latin-1 Supplement: Ä, Ç, å, ß */
     0x0100, 0x0180, /* Latin Extended-A: Ā č Ō œ */
     0x0180, 0x0250, /* Latin Extended-B: Ǝ Ƹ */
@@ -63,6 +64,7 @@ static unsigned int const blocklist[] =
     0x30a0, 0x3100, /* Katakana: ロ ル */
     0xff00, 0xfff0, /* Halfwidth and Fullwidth Forms: Ａ, Ｂ, Ｃ, ａ, ｂ, ｃ */
     0x10400, 0x10450, /* Deseret: 𐐒 𐐋 */
+#endif
     0, 0
 };
 
@@ -317,8 +319,22 @@ int main(int argc, char *argv[])
             printf_unicode(&gtab[n]);
 
             if(gtab[n].same_as == n)
-                printf_hex(" */ %s\n",
-                           glyph_data + gtab[n].data_offset, gtab[n].data_size);
+            {
+                char const *lut = " .:nmW@";
+                printf("\n");
+                for (int y = 0; y < height; ++y)
+                {
+                    for (int x = 0; x < gtab[n].data_width; ++x)
+                    {
+                        int val = glyph_data[gtab[n].data_offset + y * gtab[n].data_width + x];
+                        char ch = lut[val * val * 7 / 256 / 256];
+                        printf("%c%c", ch, ch);
+                    }
+                    printf("\n");
+                }
+                //printf_hex(" */ %s\n",
+                //           glyph_data + gtab[n].data_offset, gtab[n].data_size);
+            }
             else
             {
                 printf(" is ");
ip'>* gnu/packages/patches/u-boot-infodocs-target.patch: Delete file.
* gnu/packages/patches/u-boot-patman-guix-integration.patch: Delete file.
* gnu/local.mk: De-register patches.
* gnu/packages/patches/u-boot-allow-disabling-openssl.patch: Refresh.
* gnu/packages/patches/u-boot-sifive-prevent-reloc-initrd-fdt.patch: Refresh.
* gnu/packages/bootloaders.scm (u-boot): Update to 2023.07.02.
[native-inputs]: Add python-pyelftools.
[source]: Remove patches.
(u-boot-tools)[phases]: Update substitution for python3-coverage.
Adjust 'patch to catch more openssl incompatibilities.
Split lines in 'patch phase.
[native-inputs]: Add python-filelock and python-pytest-xdist.
(make-u-boot-sunxi64-package): Set SCP environment variable.
(u-boot-sifive-unleashed): Update to use opensbi.
(u-boot-puma-rk3399)[inputs]: Add arm-trusted-firmware-rk3399 to
package-inputs instead of native-inputs.
(u-boot-rockpro64-rk3399): Disable CONFIG_SPL_FIT_SIGNATURE in config.

Reviewed-by: Maxim Cournoyer &lt;maxim.cournoyer@gmail.com&gt;
</span></span></td><td>Vagrant Cascadian</td></tr>
<tr><td><span title='2021-08-02 13:23:32 +0100'>2021-08-02</span></td><td><a href='/guix/commit/gnu/packages/patches/u-boot-sifive-prevent-reloc-initrd-fdt.patch?id=eb46c6c5c81695af475f7e1e416d05e51157fe60'>gnu: u-boot: Update to 2021.07.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/patches/u-boot-sifive-prevent-reloc-initrd-fdt.patch: New patch.
* gnu/local.mk (dist_patch_DATA): Add it.
* gnu/packages/bootloaders.scm (%u-boot-sifive-prevent-relocating-initrd-fdt):
New variable.
(u-boot): Update to 2021.07.
[native-inputs]: Add python-pycryptodomex.
(u-boot-2021.07): Delete variable.
(u-boot-tools)[arguments]: Adapt 'patch phase, disable failing test_spl test.
(u-boot-sifive-unmatched): Use default u-boot package.
(u-boot-pinebook-pro-rk3328): Use default u-boot package.
</span></span></td><td>Pierre Langlois</td></tr>