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Ondřej Surý authored
Pull and use several autoconf archive convenience macros to simplify configure.ac. * AX_CHECK_COMPILE_FLAG(FLAG, ...) - check whether given CFLAG works * AX_CHECK_LINK_FLAG(FLAG, ...) - check whether given LDFLAG works * AX_CHECK_PREPROC_FLAG(FLAG, ...) - check whether give CPPFLAG works * AX_SAVE_FLAGS/AX_RESTORE_FLAGS - save and restore *FLAGS
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