diff --git a/byaccj-gcc14.patch b/byaccj-gcc14.patch
new file mode 100644
index 0000000..abf9fde
--- /dev/null
+++ b/byaccj-gcc14.patch
@@ -0,0 +1,10 @@
+--- byaccj1.15/src/main.c	2024-03-19 19:33:36.131296013 +0100
++++ byaccj1.15/src/main.c	2024-03-19 19:34:09.998023153 +0100
+@@ -1,6 +1,7 @@
+ #include <stdio.h>
+ #include <stdlib.h>
+ #include <string.h>
++#include <sys/unistd.h>
+ 
+ #ifndef __WIN32__  /*rwj  --  make portable*/
+ #include <signal.h>
diff --git a/byaccj.changes b/byaccj.changes
index 7907d1f..5580e7d 100644
--- a/byaccj.changes
+++ b/byaccj.changes
@@ -1,3 +1,10 @@
+-------------------------------------------------------------------
+Tue Mar 19 18:59:53 UTC 2024 - Fridrich Strba <fstrba@suse.com>
+
+- Added patch:
+  * byaccj-gcc14.patch
+    + add missing include to fix build with gcc 14 (bsc#1221696)
+
 -------------------------------------------------------------------
 Tue Jul 27 13:20:50 UTC 2021 - Fridrich Strba <fstrba@suse.com>
 
diff --git a/byaccj.spec b/byaccj.spec
index b7eaf30..a4d0efd 100644
--- a/byaccj.spec
+++ b/byaccj.spec
@@ -1,7 +1,7 @@
 #
 # spec file for package byaccj
 #
-# Copyright (c) 2021 SUSE LLC
+# Copyright (c) 2024 SUSE LLC
 #
 # All modifications and additions to the file contributed by third parties
 # remain the property of their copyright owners, unless otherwise agreed
@@ -26,6 +26,7 @@ License:        SUSE-Public-Domain
 Group:          Development/Libraries/Java
 URL:            http://byaccj.sourceforge.net/
 Source0:        https://downloads.sourceforge.net/%{name}/%{name}%{version}_src.tar.gz
+Patch0:         byaccj-gcc14.patch
 Requires:       man-pages
 
 %description
@@ -41,6 +42,7 @@ finally is a YACC for Java now!
 
 %prep
 %setup -q -n %{name}%{version}
+%patch -P 0 -p1
 
 chmod -c -x src/* docs/*
 sed -i -e 's|-arch i386 -isysroot /Developer/SDKs/MacOSX10.4u.sdk -mmacosx-version-min=10.4|$(LDFLAGS)|g' src/Makefile