headers = api_headers + local_headers + project_headers + system_headers
header_lines = ['#include ' + h for h in headers]
lines = lines[:headers_begin] + header_lines + lines[headers_end + 1:]
headers = api_headers + local_headers + project_headers + system_headers
header_lines = ['#include ' + h for h in headers]
lines = lines[:headers_begin] + header_lines + lines[headers_end + 1:]