diff -rup a/SConstruct b/SConstruct

--- a/SConstruct	2009-12-10 15:58:55.000000000 +0100

+++ b/SConstruct	2019-02-08 13:30:13.982053241 +0100

@@ -16,7 +16,7 @@ picLibBuilder = Builder(

 env['BUILDERS']['StaticLibrary'] = picLibBuilder

 env['BUILDERS']['Library'] = picLibBuilder

-opts = Options(['options.cache'])

+opts = Variables(['options.cache'])

 #opts.Add('CC', 'C compiler')

 #opts.Add('CXX', 'C++ compiler')

 opts.Add('CCFLAGS', 'General options that are passed to the C compiler')

@@ -33,9 +33,9 @@ if sys.platform != "win32":

 	opts.Add('lib_dir', 'resources directory (default: prefix/lib)', '')

 	opts.Add('plugins_dir', 'plugins directory (default: prefix/lib/btanks)', '')

 	opts.Add('resources_dir', 'resources directory (default: prefix/share/btanks)', '')

-	opts.Add(BoolOption('gcc_visibility', 'gcc visibility', 'true'))

+	opts.Add(BoolVariable('gcc_visibility', 'gcc visibility', 'true'))

-opts.Add(EnumOption('mode', 'build mode', 'release', allowed_values=('debug','release')))

+opts.Add(EnumVariable('mode', 'build mode', 'release', allowed_values=('debug','release')))

 opts.Update(env)

 opts.Save('options.cache', env.Clone())