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nAC_INIT(main.c)
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nAM_INIT_AUTOMAKE(project_name, 1.2.8)
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nAM_PROG_LIBTOOL
it supports
libtool and shared libraries
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nAC_PROG_CC (or AC_PROG_CXX) it locates the C (C++) compiler
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nAC_HEADER_STDC
it checks for
standard headers
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nAC_CHECK_HEADERS(sys/time.h /header.h) it checks for headers availability
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nAC_CHECK_LIB(crypto SSLeay_version) it checks for libraries availability
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nAC_CHECK_FUNCS(ctime) it
checks for functions availability
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nAC_PROG_INSTALL
it checks for
BSD compatible install utility
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nAC_OUTPUT([Makefile])