From 24cd0d2de994e0193ac41cad05fee15898f6ec4c Mon Sep 17 00:00:00 2001
From: Xiangyan Sun <wishstudio@gmail.com>
Date: Fri, 8 May 2026 21:41:29 -0700
Subject: [PATCH] cgui: fix build with gcc15

---
 pkgs/by-name/cg/cgui/fix-gcc15.patch | 15 +++++++++++++++
 pkgs/by-name/cg/cgui/package.nix     |  4 ++++
 2 files changed, 19 insertions(+)
 create mode 100644 pkgs/by-name/cg/cgui/fix-gcc15.patch

diff --git a/pkgs/by-name/cg/cgui/fix-gcc15.patch b/pkgs/by-name/cg/cgui/fix-gcc15.patch
new file mode 100644
index 000000000000..653fd269d2f6
--- /dev/null
+++ b/pkgs/by-name/cg/cgui/fix-gcc15.patch
@@ -0,0 +1,15 @@
+diff --git a/examples/25viewer.c b/examples/25viewer.c
+index 37e4585..a0328f0 100644
+--- a/examples/25viewer.c
++++ b/examples/25viewer.c
+@@ -10,8 +10,9 @@
+ 
+ static const char *fname; /* stores name of file to open */
+ 
+-void quit()
++void quit(void *data)
+ {
++   (void)data;
+    exit(0);
+ }
+ 
diff --git a/pkgs/by-name/cg/cgui/package.nix b/pkgs/by-name/cg/cgui/package.nix
index 9f510370b3ca..abd0c6eaa952 100644
--- a/pkgs/by-name/cg/cgui/package.nix
+++ b/pkgs/by-name/cg/cgui/package.nix
@@ -17,6 +17,10 @@ stdenv.mkDerivation (finalAttrs: {
     sha256 = "1pp1hvidpilq37skkmbgba4lvzi01rasy04y0cnas9ck0canv00s";
   };
 
+  patches = [
+    ./fix-gcc15.patch
+  ];
+
   buildInputs = [
     texinfo
     allegro