A VPATH build of diffutils (git HEAD, with GNU make, on Ubuntu 22.04)
fails like this:
$ mkdir bb
$ cd bb
$ ../configure
$ make
...
make[1]: Entering directory '/DIFFUTILS/diffutils/bb/src'
GEN paths.h
CC cmp.o
In file included from ../../src/cmp.c:19:
../../src/system.h:87:10: fatal error: version.h: No such file or directory
87 | #include "version.h"
| ^~~~~~~~~~~
compilation terminated.
make[1]: *** [Makefile:2451: cmp.o] Error 1
The attached patch fixes it.
>From 17ef3ec3c21a9e56385538a620b2837b4b0a1bdd Mon Sep 17 00:00:00 2001
From: Bruno Haible <br...@clisp.org>
Date: Sun, 21 Jul 2024 19:30:46 +0200
Subject: [PATCH] build: Fix a build failure in a VPATH build
* src/Makefile.am (cmp.$(OBJEXT) etc.): Depend on version.h.
---
src/Makefile.am | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/src/Makefile.am b/src/Makefile.am
index 01c6f1f..04c9201 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -52,7 +52,7 @@ noinst_HEADERS = diff.h system.h
MOSTLYCLEANFILES = paths.h paths.ht
-cmp.$(OBJEXT) diff3.$(OBJEXT) diff.$(OBJEXT) sdiff.$(OBJEXT): paths.h
+cmp.$(OBJEXT) diff3.$(OBJEXT) diff.$(OBJEXT) sdiff.$(OBJEXT): paths.h version.h
gdiff = `echo diff|sed '$(transform)'`
BUILT_SOURCES = paths.h
--
2.34.1
