--- SConstruct.orig	2017-12-28 05:14:45 UTC
+++ SConstruct
@@ -68,7 +68,7 @@ elif (os.name == "nt"):
     if (os.getenv("VCINSTALLDIR") == None or platform_arg == "android" or platform_arg == "javascript"):
         custom_tools = ['mingw']
 
-env_base = Environment(tools=custom_tools)
+env_base = Environment(tools=custom_tools, ENV = os.environ)
 if 'TERM' in os.environ:
     env_base['ENV']['TERM'] = os.environ['TERM']
 env_base.AppendENVPath('PATH', os.getenv('PATH'))
@@ -297,17 +297,20 @@ if selected_platform in platform_list:
     if env["extra_suffix"] != '':
         env.extra_suffix += '.' + env["extra_suffix"]
 
-    CCFLAGS = env.get('CCFLAGS', '')
-    env['CCFLAGS'] = ''
+    env['CC'] = os.environ['CC']
+    env['CXX'] = os.environ['CXX']
+
+    CCFLAGS = os.environ['CXXFLAGS']
+    env['CCFLAGS'] = []
 
     env.Append(CCFLAGS=str(CCFLAGS).split())
 
-    CFLAGS = env.get('CFLAGS', '')
-    env['CFLAGS'] = ''
+    CFLAGS = os.environ['CFLAGS']
+    env['CFLAGS'] = []
 
     env.Append(CFLAGS=str(CFLAGS).split())
 
-    LINKFLAGS = env.get('LINKFLAGS', '')
+    LINKFLAGS = os.environ['LDFLAGS']
     env['LINKFLAGS'] = ''
 
     env.Append(LINKFLAGS=str(LINKFLAGS).split())