Configure: Autodetect SPOUT wrapper

+ configurable location in the SPOUT wrapper build script
+ install the Spout DLL with the build script to /usr/local/bin

configure.ac

@@ -2884,13 +2884,19 @@ fi
 # ------------------------------------------------------------------------------
 spout=no
 AC_ARG_ENABLE(spout,
-[  --enable-spout          enables Spout support (default is disabled)]
+[  --enable-spout          enables Spout support (default is auto)]
 [                          Requires: Spout],
     [spout_req=$enableval],
-    [spout_req=no]
+    [spout_req=auto]
     )
 
-if test $spout_req == yes
+FOUND_SPOUT_WRAPPER=no
+if test $system = Windows
+then
+        AC_CHECK_LIB(spout_wrapper, spout_create_receiver, [FOUND_SPOUT_WRAPPER=yes])
+fi
+
+if test $spout_req != no -a $FOUND_SPOUT_WRAPPER = yes
 then
         AC_DEFINE([HAVE_SPOUT], [1], [Build with Spout support])
         LIBS="$LIBS -lspout_wrapper"

data/scripts/build_spout64.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/bin/bash -eu
 
 #######################################
 # USAGE
@@ -35,7 +35,13 @@ function run_vs10
     run_in_vs_env VS100COMNTOOLS "$@"
 }
 
-run_vs16 cl //DEXPORT_DLL_SYMBOLS src/spout_sender.cpp src/spout_receiver.cpp //LD src/SpoutSDK/Binaries/x64/Spout.lib //Fespout_wrapper
+LIBDIR=${1:-src/SpoutSDK/Binaries/x64}
+MSVS_PATH=`/c/Program\ Files\ \(x86\)/Microsoft\ Visual\ Studio/Installer/vswhere.exe -latest -property installationPath`
+
+eval vssetup=\"$MSVS_PATH\"'\\VC\\Auxiliary\\Build\\vcvars64.bat'
+cmd //Q //C call "$vssetup" "&&" cl //DEXPORT_DLL_SYMBOLS src/spout_sender.cpp src/spout_receiver.cpp //LD $LIBDIR/Spout.lib //Fespout_wrapper
+
 cp spout_wrapper.dll /usr/local/bin
 cp spout_wrapper.lib /usr/local/lib
+cp $LIBDIR/Spout.dll /usr/local/bin