[ptxdist] [PATCH] configure.ac: support GNU coreutils binaries with "gnu" prefix

[Markus Heidelberg via ptxdist <ptxdist@pengutronix.de>]

Ubuntu 25.10 switched most of the coreutils parts from GNU to uutils
implementation where the "--version" check fails during configure run:

  checking for GNU cat... configure: error: could not find GNU cat

The GNU coreutils are still installed with a filename prefix,
e.g. /usr/bin/gnucat.

Signed-off-by: Markus Heidelberg <m.heidelberg@cab.de>
---
 configure.ac | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index c6ad34fa6..e56601f51 100644
--- a/configure.ac
+++ b/configure.ac
@@ -137,7 +137,7 @@ dnl   $1: tool to search for
 dnl   $2: package where the tool is (e.g. 'coreutils')
 AC_DEFUN([GNU_TOOL],
 	[AC_CACHE_CHECK([for GNU $1], [ac_cv_path_gnu_$1],
-		[AC_PATH_PROGS_FEATURE_CHECK([gnu_$1], [g$1 $1.gnu $1-gnu $1],
+		[AC_PATH_PROGS_FEATURE_CHECK([gnu_$1], [g$1 gnu$1 $1.gnu $1-gnu $1],
 			[[out=`$ac_path_gnu_$1 --version 2>/dev/null | $SED -ne "s/.*\(GNU\) $2.*/\1/p"`
 				test "x$out" = xGNU && ac_cv_path_gnu_$1=$ac_path_gnu_$1 ac_path_gnu_$1_found=:]],
 			[AC_MSG_ERROR([could not find GNU $1])])])
-- 
2.43.0