Added a solution to generate only GPL version.

windows_deliv/make_delivery.btm

@@ -21,6 +21,7 @@ iff %@INDEX[%@LOWER[%$],h] ge 0 then
 	echo   - no_compile: to discard any compilation
 	echo   - no_new_ec: to avoid compiling a new version of EiffelStudio
 	echo   - enterprise: to build only the enterprise version of EiffelStudio
+	echo   - gpl: to build only the GPL version of EiffelStudio
 	echo   - no_wizards: to discard wizards building
 	echo   - no_install: to generare only the delivery (but not the installation executable) 
 	echo   (or nothing to fully regenerate the installation).
@@ -42,9 +43,12 @@ else
 	unset /Q NO_NEW_EC
 endiff
 iff %@INDEX[%@LOWER[%$],enterprise] ge 0 then
-	set BUILD_ENTERPRISE_ONLY="True"
-else
-	unset /Q BUILD_ENTERPRISE_ONLY
+	set NO_GPL_BUILD="True"
+endiff
+iff %@INDEX[%@LOWER[%$],gpl] ge 0 then
+	set NO_ENTERPRISE_BUILD="True"
+	unset /Q BUILD_ENTERPRISE
+	set BUILD_GPL="True"
 endiff
 iff %@INDEX[%@LOWER[%$],no_wizard] ge 0 then
 	set NO_WIZARDS="True"
@@ -367,7 +371,6 @@ else
 endiff
 
 call %INIT_DIR%\call_make_installations.btm
-
 cdd %INIT_DIR%
 
 REM Finish