Description: Use CPPFLAGS environment variable
Forwarded: https://github.com/sunpinyin/sunpinyin/pull/99

commit 4c9ee1b09aa237722414a82a8357408616802811
Author: Changwoo Ryu <cwryu@debian.org>
Date:   Wed Dec 11 11:32:16 2019 +0900

    Use CPPFLAGS environment variable
    
    It's useful when providing additional build flags like -D_FORTIFY_SOURCE=2.

diff --git a/SConstruct b/SConstruct
index 9cebc03..696b2fc 100644
--- a/SConstruct
+++ b/SConstruct
@@ -259,6 +259,7 @@ libdir = env['LIBDIR']
 # pass through environmental variables
 envvar = [('CC', 'CC'),
           ('CXX', 'CXX'),
+          ('CPPFLAGS', 'CPPFLAGS'),
           ('CFLAGS', 'CFLAGS'),
           ('CXXFLAGS', 'CXXFLAGS'),
           ('LDFLAGS', 'LINKFLAGS'),