From 2b491ae699870d3dcc047a529b1a69ad59792dd5 Mon Sep 17 00:00:00 2001
From: Remi Collet <remi@remirepo.net>
Date: Sat, 15 Mar 2025 07:58:43 +0100
Subject: [PATCH] try pngalpha if png16malpha not available

---
 configure    | 6 ++++--
 configure.ac | 2 ++
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/configure b/configure
index e24752caa..ec13f0daf 100755
--- a/configure
+++ b/configure
@@ -38027,6 +38027,8 @@ printf "%s\n" "$GSColorDevice" >&6; }
 printf %s "checking for gs alpha device... " >&6; }
     if $PSDelegate -q -dBATCH -sDEVICE=$GSAlphaDevice -sOutputFile=/dev/null < /dev/null 1>&5 2>&5; then
         :
+    elif $PSDelegate -q -dBATCH -sDEVICE=pngalpha -sOutputFile=/dev/null < /dev/null 1>&5 2>&5; then
+        GSAlphaDevice=pngalpha
     else
         GSAlphaDevice=$GSColorDevice
     fi
diff --git a/configure.ac b/configure.ac
index 5f990f3f2..c37d12ab9 100644
--- a/configure.ac
+++ b/configure.ac
@@ -3644,6 +3644,8 @@ if test $have_gs = 'yes'; then
     AC_MSG_CHECKING([for gs alpha device])
     if $PSDelegate -q -dBATCH -sDEVICE=$GSAlphaDevice -sOutputFile=/dev/null < /dev/null 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
         :
+    elif $PSDelegate -q -dBATCH -sDEVICE=pngalpha -sOutputFile=/dev/null < /dev/null 1>&5 2>&5; then
+        GSAlphaDevice=pngalpha
     else
         GSAlphaDevice=$GSColorDevice
     fi