mingw: unbreak make check

Even if it does nothing because there is no installation available .-)

config_host.mk.in

@@ -525,6 +525,7 @@ export UPD=@UPD@
 export USE_FT_EMBOLDEN=@USE_FT_EMBOLDEN@
 export use_shl_version=@use_shl_version@
 export USE_XINERAMA=@USE_XINERAMA@
+export UUIDGEN=@UUIDGEN@
 export VALGRIND_CFLAGS=@VALGRIND_CFLAGS@
 export VALIDATOR_EXTENSION_PACK=@VALIDATOR_EXTENSION_PACK@
 export VERBOSE=@VERBOSE@

configure.in

@@ -8159,6 +8159,22 @@ the  Windows SDK are installed.])
 fi
 AC_SUBST(WINDOWS_SDK_HOME)
 
+dnl =========================================
+dnl Check for uuidgen
+dnl =========================================
+if test "$_os" = "WINNT"; then
+    if test "$WITH_MINGW" = "yes"; then
+        AC_PATH_PROG([UUIDGEN], [uuid])
+        if test -z "$UUIDGEN"; then
+            AC_MSG_ERROR([uuid is needed for dev-install])
+        fi
+    else
+        # presence is already tested above in the WINDOWS_SDK_HOME check
+        UUIDGEN=uuidgen.exe
+        AC_SUBST(UUIDGEN)
+    fi
+fi
+
 dnl =========================================
 dnl Check for the Microsoft DirectX SDK.
 dnl =========================================

solenv/bin/modules/installer/windows/msiglobal.pm

@@ -1266,7 +1266,7 @@ sub get_guid_list
 
     if ( $log ) { installer::logger::include_header_into_logfile("Generating $number GUID"); }
 
-    my $uuidgen = "uuidgen.exe";        # Has to be in the path
+    my $uuidgen = $ENV{'UUIDGEN'};        # Has to be in the path
 
     # "-c" for uppercase output