diff --git a/pkgs/tools/backup/ugarit/eggs.nix b/pkgs/tools/backup/ugarit/eggs.nix
index dbbb9a56c47b..cc8af0585382 100644
--- a/pkgs/tools/backup/ugarit/eggs.nix
+++ b/pkgs/tools/backup/ugarit/eggs.nix
@@ -192,6 +192,11 @@ rec {
     buildInputs = [
 
     ];
+
+    patches = [
+      # missing include <sys/sysmacros.h> since Jan 2025, cause unknown
+      ./posix-extras-add-sysmacros-include.patch
+    ];
   };
 
   record-variants = eggDerivation {
diff --git a/pkgs/tools/backup/ugarit/posix-extras-add-sysmacros-include.patch b/pkgs/tools/backup/ugarit/posix-extras-add-sysmacros-include.patch
new file mode 100644
index 000000000000..bd374b679d84
--- /dev/null
+++ b/pkgs/tools/backup/ugarit/posix-extras-add-sysmacros-include.patch
@@ -0,0 +1,10 @@
+--- a/posix-extras.scm	1970-01-01 01:00:01.000000000 +0100
++++ b/posix-extras.scm	1970-01-01 01:00:01.000000000 +0100
+@@ -110,6 +110,7 @@ static void *C_not_implemented_ptr(void)
+ #endif
+ 
+ #if defined (__unix__) || defined (C_XXXBSD)
++#include <sys/sysmacros.h>
+ #include <sys/types.h>
+ #define C_mknod(fn, m, d) C_fix(mknod(C_data_pointer(fn), C_unfix(m), C_unfix(d)))
+ #define C_mknod64(fn, m, maj, min) C_fix(mknod(C_data_pointer(fn), C_unfix(m), makedev(C_num_to_int(maj), C_num_to_int(min))))