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building on OS X: configure:9101: error: no usable dependency style found


trying to build -current/amd64 on OS X(*) gives the following error in …/external/gpl3/gcc/usr.bin/backend:

	checking how to run the C++ preprocessor... g++ -E
	checking for unordered_map... yes
	checking for tr1/unordered_map... no
	checking for ext/hash_map... yes
	checking dependency style of g++... none
==>	configure: error: no usable dependency style found
	*** Failed target:  auto-build.h

What to do? 

Contents of src-current/obj.amd64-Darwin-XXX/external/gpl3/gcc/usr.bin/backend//.ab/config.log is attached.

(*)  System details:

% uname -a
Darwin promise.local 14.5.0 Darwin Kernel Version 14.5.0: Tue Sep  1 21:23:09 PDT 2015; root:xnu-2782.50.1~1/RELEASE_X86_64 x86_64

% gcc -v
Configured with: --prefix=/Applications/ --with-gxx-include-dir=/usr/include/c++/4.2.1
Apple LLVM version 7.0.2 (clang-700.1.81)
Target: x86_64-apple-darwin14.5.0
Thread model: posix

 - Hubert

Attachment: config.log
Description: Binary data

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