old_contents: {
  	'repo_type' : 'git',
  	'url' : 'https://github.com/KhronosGroup/Vulkan-Loader.git',
  	# 'branch': '85886d8517aae8e2834825255dc2989adaab62be',
  	'configure_options' : 
  		'.. {cmake_prefix_options} -DVULKAN_HEADERS_INSTALL_DIR={target_prefix} '
  		'-DCMAKE_BUILD_TYPE=Release '
  		'-DBUILD_TESTS=OFF '
  		'-DCMAKE_INSTALL_PREFIX={target_prefix} '
  		'-DBUILD_TESTS=OFF ' #-DENABLE_STATIC_LOADER=ON 
  	,
  	# 'cpu_count': 1,
  	'conf_system' : 'cmake',
  	'source_subfolder' : '_build',
  	'patches' : [
  		# ('vulkan/0001-fix-cross-compiling.patch', '-p1', '..'),
  		('vulkan/0001-mingw-workarounds.patch','-p1','..'),
  	],
  	'regex_replace': {
  		'post_install': [
  			{
  				0: r'(?:[^\r\n]+)?libdir=(?:[^\r\n]+)?',
  				'in_file': '{pkg_config_path}/vulkan.pc',
  				'out_file': '{pkg_config_path}/vulkan.pc'
  			},
  			{
  				0: r'exec_prefix=([^\r\n]+)',
  				1: r'prefix={{target_prefix}}\nexec_prefix=\1\nlibdir=${{exec_prefix}}/lib\n',
  				'in_file': '{pkg_config_path}/vulkan.pc',
  				'out_file': '{pkg_config_path}/vulkan.pc'
  			},
  			{
  				0: r'-lvulkan$',
  				1: r'-lvulkan-1',
  				'in_file': '{pkg_config_path}/vulkan.pc',
  				'out_file': '{pkg_config_path}/vulkan.pc'
  			},
  		]
  	},
  	'depends_on' : [ 'vulkan_headers' ], # 'vulkan-d3dheaders',
  	'_info' : { 'version' : None, 'fancy_name' : 'Vulkan Loader' },
  }
new_contents: {
  	'repo_type' : 'git',
  	'url' : 'https://github.com/KhronosGroup/Vulkan-Loader.git',
  	# 'branch': '85886d8517aae8e2834825255dc2989adaab62be',
  	'configure_options' : 
  		'.. {cmake_prefix_options} -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX={target_prefix} '
  		'-DVULKAN_HEADERS_INSTALL_DIR={target_prefix} '
  		'-DBUILD_TESTS=OFF '
  		'-DBUILD_STATIC_LOADER=ON '
  	,
  	# 'cpu_count': 1,
  	'conf_system' : 'cmake',
  	'source_subfolder' : '_build',
  	'patches' : [
  		# ('vulkan/0001-fix-cross-compiling.patch', '-p1', '..'),
  		('vulkan/0001-mingw-workarounds.patch','-p1','..'),
  	],
  	# 'env_exports' : { 
  	# 	'CFLAGS'   : '-O3 -D_POSIX_C_SOURCE',
  	# 	'CXXFLAGS' : '-O3 -D_POSIX_C_SOURCE',
  	# 	'CPPFLAGS' : '-O3 -D_POSIX_C_SOURCE',
  	# 	'LDFLAGS'  : '-O3 -D_POSIX_C_SOURCE',
  	# },
  	'regex_replace': {
  		'post_install': [
  			{
  				0: r'(?:[^\r\n]+)?libdir=(?:[^\r\n]+)?',
  				'in_file': '{pkg_config_path}/vulkan.pc',
  				'out_file': '{pkg_config_path}/vulkan.pc'
  			},
  			{
  				0: r'exec_prefix=([^\r\n]+)',
  				1: r'prefix={{target_prefix}}\nexec_prefix=\1\nlibdir=${{exec_prefix}}/lib\n',
  				'in_file': '{pkg_config_path}/vulkan.pc',
  				'out_file': '{pkg_config_path}/vulkan.pc'
  			},
  			{
  				0: r'-lvulkan$',
  				1: r'-lvulkan-1',
  				'in_file': '{pkg_config_path}/vulkan.pc',
  				'out_file': '{pkg_config_path}/vulkan.pc'
  			},
  		]
  	},
  	'depends_on' : [ 'vulkan_headers' ], # 'vulkan-d3dheaders',
  	'_info' : { 'version' : None, 'fancy_name' : 'Vulkan Loader' },
  }
subject: update configure options