BLD: apply environment flags set in conda-build

Anaconda compilers sets CPPFLAGS, etc., environment variables.
Apply them explicitly in sconscript.local for conda build.

Author: pavoljuhas

conda-recipe/sconscript.local

@@ -4,9 +4,15 @@ Import('env')
 
 import os
 
+# Apply environment settings for Anaconda compilers
+env.Replace(CXX=os.environ['CXX'])
+env.MergeFlags(os.environ['CFLAGS'])
+env.MergeFlags(os.environ['CPPFLAGS'])
+env.MergeFlags(os.environ['CXXFLAGS'])
+env.MergeFlags(os.environ['LDFLAGS'])
+
 # Silence copious warnings from the boost headers.
 P = os.environ['PREFIX']
 env.Prepend(CCFLAGS=['-isystem{}/include'.format(P)])
-env.Replace(CXX=os.environ['CXX'])
 
 # vim: ft=python

src/SConscript

@@ -4,10 +4,6 @@ Import('env')
 
 # Build environment configuration --------------------------------------------
 
-# Apply CFLAGS, CXXFLAGS, LDFLAGS from the system environment.
-flagnames = 'CFLAGS CXXFLAGS CPPFLAGS LDFLAGS'.split()
-env.MergeFlags([os.environ.get(n, '') for n in flagnames])
-
 # Insert LIBRARY_PATH explicitly because some compilers
 # ignore it in the system environment.
 env.PrependUnique(LIBPATH=env['ENV'].get('LIBRARY_PATH', '').split(':'))