diff --git a/pkgs/by-name/de/dev86/package.nix b/pkgs/by-name/de/dev86/package.nix
index ba075a1d7418..a5518e15275a 100644
--- a/pkgs/by-name/de/dev86/package.nix
+++ b/pkgs/by-name/de/dev86/package.nix
@@ -6,21 +6,15 @@
 
 stdenv.mkDerivation (finalAttrs: {
   pname = "dev86";
-  version = "1.0.1-unstable-2025-02-12";
+  version = "1.0.1-unstable-2026-05-15";
 
   src = fetchFromCodeberg {
     owner = "jbruchon";
     repo = "dev86";
-    rev = "0332db1ceb238fa7f98603cdf4223a1d839d4b31";
-    hash = "sha256-f6C7ykOmOHwxeMsF1Wm81FBBJNwTP0cF4+mFMzsc208=";
+    rev = "8cf785fc11516b31404ea6593d9fc5a411f59dad";
+    hash = "sha256-nY5awJzEO+xbJRAbeRJgKjJf30SNz2Bg346KMNDtmls=";
   };
 
-  patches = [
-    # Fix for GCC 15/C23 by de-K&R-ing function definitions and adding
-    # missing parameters to function declarations where necessary.
-    ./unproto-c23-compatibility.patch
-  ];
-
   makeFlags = [ "PREFIX=${placeholder "out"}" ];
 
   meta = {
diff --git a/pkgs/by-name/de/dev86/unproto-c23-compatibility.patch b/pkgs/by-name/de/dev86/unproto-c23-compatibility.patch
deleted file mode 100644
index a931f1072914..000000000000
--- a/pkgs/by-name/de/dev86/unproto-c23-compatibility.patch
+++ /dev/null
@@ -1,245 +0,0 @@
-diff --git a/unproto/error.c b/unproto/error.c
-index 667d978cbb..2fbccacb4d 100644
---- a/unproto/error.c
-+++ b/unproto/error.c
-@@ -53,7 +53,7 @@
- 
- #include <stdio.h>
- 
--extern void exit();
-+extern void exit(int status);
- 
- /* Application-specific stuff */
- 
-diff --git a/unproto/error.h b/unproto/error.h
-index dfb27e9067..cb52ae646b 100644
---- a/unproto/error.h
-+++ b/unproto/error.h
-@@ -1,6 +1,6 @@
- /* @(#) error.h 1.2 92/01/15 21:53:14 */
- 
- extern int errcount;			/* error counter */
--extern void error();			/* default context */
--extern void error_where();		/* user-specified context */
--extern void fatal();			/* fatal error */
-+extern void error(char *text);			/* default context */
-+extern void error_where(char *path, int line, char *text);		/* user-specified context */
-+extern void fatal(char *text);			/* fatal error */
-diff --git a/unproto/strsave.c b/unproto/strsave.c
-index 2ee00b4172..faa4e18686 100644
---- a/unproto/strsave.c
-+++ b/unproto/strsave.c
-@@ -28,7 +28,7 @@
- #include <string.h>
- 
- extern int hash(register char *s, unsigned size);
--extern char *malloc();
-+extern char *malloc(long size);
- 
- /* Application-specific stuff */
- 
-diff --git a/unproto/symbol.c b/unproto/symbol.c
-index 67a4bf0bc6..a4beab5e92 100644
---- a/unproto/symbol.c
-+++ b/unproto/symbol.c
-@@ -45,7 +45,7 @@
- #include <string.h>
- 
- extern int hash(register char *s, unsigned size);
--extern char *malloc();
-+extern char *malloc(long size);
- 
- /* Application-specific stuff */
- 
-diff --git a/unproto/symbol.h b/unproto/symbol.h
-index 0711c1f4dc..0e2b1d88f8 100644
---- a/unproto/symbol.h
-+++ b/unproto/symbol.h
-@@ -6,6 +6,6 @@
-     struct symbol *next;
- };
- 
--extern void sym_enter();		/* add symbol to table */
--extern struct symbol *sym_find();	/* locate symbol */
-+extern void sym_enter(char *name, int type);		/* add symbol to table */
-+extern struct symbol *sym_find(register char *name);	/* locate symbol */
- extern void sym_init();			/* prime the table */
-diff --git a/unproto/tok_class.c b/unproto/tok_class.c
-index 04207a07f3..9af67188ca 100644
---- a/unproto/tok_class.c
-+++ b/unproto/tok_class.c
-@@ -51,8 +51,8 @@
- #include <stdio.h>
- #include <string.h>
- 
--extern long time();
--extern char* ctime();
-+extern long time(long *tloc);
-+extern char* ctime(long *clock);
- 
- /* Application-specific stuff */
- 
-@@ -61,13 +61,13 @@
- #include "token.h"
- #include "symbol.h"
- 
--static struct token *tok_list();
--static void tok_list_struct();
--static void tok_list_append();
--static void tok_strcat();
--static void tok_time();
--static void tok_date();
--static void tok_space_append();
-+static struct token *tok_list(struct token *t);
-+static void tok_list_struct(register struct token *list, register struct token *t);
-+static void tok_list_append(struct token *h, struct token *t);
-+static void tok_strcat(register struct token *t1);
-+static void tok_time(struct token *t);
-+static void tok_date(struct token *t);
-+static void tok_space_append(register struct token *list, register struct token *t);
- 
- #if defined(MAP_VOID_STAR) || defined(MAP_VOID)
- static void tok_void();			/* rewrite void keyword */
-diff --git a/unproto/tok_io.c b/unproto/tok_io.c
-index 288950b3ac..773ca5bf4d 100644
---- a/unproto/tok_io.c
-+++ b/unproto/tok_io.c
-@@ -89,7 +89,7 @@
- #include "vstring.h"
- #include "error.h"
- 
--extern char *strsave();			/* XXX need include file */
-+extern char *strsave(register char *str);			/* XXX need include file */
- 
- /* Stuff to keep track of original source file name and position */
- 
-@@ -104,12 +104,12 @@
- 
- /* Forward declarations */
- 
--static int read_quoted();
--static void read_comment();
-+static int read_quoted(register struct vstring *vs, int ch);
-+static void read_comment(register struct vstring *vs);
- static int backslash_newline();
--static char *read_hex();
--static char *read_octal();
--static void fix_line_control();
-+static char *read_hex(struct vstring *vs, register char *cp);
-+static char *read_octal(register struct vstring *vs, register char *cp, register int c);
-+static void fix_line_control(register char *path, register int line);
- 
-  /*
-   * Character input with one level of pushback. The INPUT() macro recursively
-diff --git a/unproto/tok_pool.c b/unproto/tok_pool.c
-index e2ed107ce7..bbe3d184c5 100644
---- a/unproto/tok_pool.c
-+++ b/unproto/tok_pool.c
-@@ -37,7 +37,7 @@
- 
- /* C library */
- 
--extern char *malloc();
-+extern char *malloc(long size);
- 
- /* Application-specific stuff */
- 
-diff --git a/unproto/token.h b/unproto/token.h
-index bb2f50a106..e3752a0eb3 100644
---- a/unproto/token.h
-+++ b/unproto/token.h
-@@ -27,11 +27,11 @@
- /* Input/output functions and macros */
- 
- extern struct token *tok_get();		/* read next single token */
--extern void tok_show();			/* display (composite) token */
-+extern void tok_show(register struct token *t);			/* display (composite) token */
- extern struct token *tok_class();	/* classify tokens */
--extern void tok_unget();		/* stuff token back into input */
-+extern void tok_unget(register struct token *t);		/* stuff token back into input */
- extern void put_nl();			/* print newline character */
--extern void tok_show_ch();		/* emit single-character token */
-+extern void tok_show_ch(register struct token *t);		/* emit single-character token */
- 
- #define	tok_flush(t)	(tok_show(t), tok_free(t))
- 
-@@ -46,7 +46,7 @@
- /* Memory management */
- 
- struct token *tok_alloc();		/* allocate token storage */
--extern void tok_free();			/* re-cycle storage */
-+extern void tok_free(register struct token *t);			/* re-cycle storage */
- 
- /* Context */
- 
-diff --git a/unproto/unproto.c b/unproto/unproto.c
-index 18fc2aaecf..802b91dd3e 100644
---- a/unproto/unproto.c
-+++ b/unproto/unproto.c
-@@ -140,7 +140,7 @@
- #include <errno.h>
- #include <string.h>
- 
--extern void exit();
-+extern void exit(int status);
- extern int optind;
- extern char *optarg;
- extern int getopt();
-@@ -159,16 +159,16 @@
- 
- /* Forward declarations. */
- 
--static struct token *dcl_flush();
--static void block_flush();
-+static struct token *dcl_flush(register struct token *t);
-+static void block_flush(register struct token *t);
- static void block_dcls();
--static struct token *show_func_ptr_type();
--static struct token *show_struct_type();
--static void show_arg_name();
--static void show_type();
--static void pair_flush();
--static void check_cast();
--static void show_empty_list();
-+static struct token *show_func_ptr_type(struct token *t1, struct token *t2);
-+static struct token *show_struct_type(register struct token *p);
-+static void show_arg_name(register struct token *s);
-+static void show_type(register struct token *s);
-+static void pair_flush(register struct token *t, register int start, register int stop);
-+static void check_cast(struct token *t);
-+static void show_empty_list(register struct token *t);
- 
- #define	check_cast_flush(t)	(check_cast(t), tok_free(t))
- 
-diff --git a/unproto/vstring.c b/unproto/vstring.c
-index 220bd530fe..ef9bcffa3c 100644
---- a/unproto/vstring.c
-+++ b/unproto/vstring.c
-@@ -67,8 +67,8 @@
- 
- /* C library */
- 
--extern char *malloc();
--extern char *realloc();
-+extern char *malloc(long size);
-+extern char *realloc(char *p, long size);
- 
- /* Application-specific stuff */
- 
-diff --git a/unproto/vstring.h b/unproto/vstring.h
-index c2e1f88a77..16a17aa815 100644
---- a/unproto/vstring.h
-+++ b/unproto/vstring.h
-@@ -5,9 +5,9 @@
-     char   *last;			/* last position */
- };
- 
--extern struct vstring *vs_alloc();	/* initial allocation */
--extern char *vs_realloc();		/* string extension */
--extern char *vs_strcpy();		/* copy string */
-+extern struct vstring *vs_alloc(int len);	/* initial allocation */
-+extern char *vs_realloc(register struct vstring *vp, char *cp);		/* string extension */
-+extern char *vs_strcpy(register struct vstring *vp, register char *dst, register char *src);		/* copy string */
- 
- /* macro to add one character to auto-resized string */
-