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import sys

# Ugly but necessary hack: import numpy here so that wscript in sub directories
# will see this numpy and not an already installed one
import __builtin__
__builtin__.__NUMPY_SETUP__ = True

from bento.commands.hooks \
    import \
        pre_configure
from bento.commands.extras.waf \
    import \
        ConfigureWafContext, BuildWafContext

def check_blas_lapack(conf):
    conf.env.HAS_CBLAS = False
    if sys.platform == "win32":
        print("No blas/lapack check implemented on win32")
    elif sys.platform == "darwin":
        try:
            conf.check(framework="Accelerate", msg="Checking for framework Accelerate", uselib_store="CBLAS")
            conf.env.HAS_CBLAS = True

            conf.check(framework="Accelerate", msg="Checking for framework Accelerate", uselib_store="LAPACK")
            conf.env.HAS_LAPACK = True
        except waflib.Errors.ConfigurationError:
            pass
    else:
        try:
            conf.check_cc(lib=["cblas", "atlas"], uselib_store="CBLAS")
            conf.env.HAS_CBLAS = True

            conf.check_cc(lib=["lapack", "f77blas", "cblas", "atlas"],
                          uselib_store="LAPACK")
            conf.env.HAS_LAPACK = True
        except waflib.Errors.ConfigurationError:
            pass

    # You can manually set up blas/lapack as follows:
    #conf.env.HAS_CBLAS = True
    #conf.env.LIB_CBLAS = ["cblas", "atlas"]
    #conf.env.HAS_LAPACK = True
    #conf.env.LIB_LAPACK = ["lapack", "f77blas", "cblas", "atlas"]

@pre_configure()
def configure(context):
    conf = context.waf_context
    conf.load("compiler_c")
    conf.load("python")

    conf.check_python_version((2, 4, 0))
    conf.check_python_headers()

    check_blas_lapack(conf)

def startup(context):
    context.register_context("configure", ConfigureWafContext)
    context.register_context("build", BuildWafContext)