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Roland Levillain authored
* m4/ax_check_compile_flag.m4: New. Imported from http://www.gnu.org/software/autoconf-archive/ax_check_compile_flag.html. * configure.ac: Ensure AX_* macros are expanded. (WARNINGS_CXXFLAGS): Add `-Wno-unused-local-typedefs' if the C++ compiler supports this flag.
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