Enhancement #750 » 0001-Update-build-configuration.patch
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     m4_pattern_allow([^AM_]) 
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     m4_pattern_allow([^AC_]) 
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     AC_PREREQ([2.69]) 
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     AC_INIT([Bip IRC Proxy],[0.9.2-git],[http://bip.milkypond.org/projects/bip/activity],[bip],[http://bip.milkypond.org/]) 
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     AM_INIT_AUTOMAKE([foreign subdir-objects -Wall -Werror]) 
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     AC_PROG_INSTALL 
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     AM_PROG_LEX 
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     AC_PROG_YACC 
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     m4_ifndef([PKG_PROG_PKG_CONFIG], [m4_fatal([Please install pkg-config.])]) 
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     PKG_PROG_PKG_CONFIG 
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     dnl PKG_PREREQ(MIN-VERSION) 
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     dnl ----------------------- 
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     dnl Since: 0.29 
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     dnl 
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     dnl Verify that the version of the pkg-config macros are at least 
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     dnl MIN-VERSION. Unlike PKG_PROG_PKG_CONFIG, which checks the user's 
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     dnl installed version of pkg-config, this checks the developer's version 
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     dnl of pkg.m4 when generating configure. 
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     dnl 
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     dnl To ensure that this macro is defined, also add: 
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     dnl m4_ifndef([PKG_PREREQ], 
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     dnl     [m4_fatal([must install pkg-config 0.29 or later before running autoconf/autogen])]) 
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     dnl 
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     dnl See the "Since" comment for each macro you use to see what version 
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     dnl of the macros you require. 
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     m4_defun([PKG_PREREQ], 
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     [m4_define([PKG_MACROS_VERSION], [0.29.1]) 
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     m4_if(m4_version_compare(PKG_MACROS_VERSION, [$1]), -1, 
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     	[m4_fatal([pkg.m4 version $1 or higher is required but ]PKG_MACROS_VERSION[ found])]) 
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     ])dnl PKG_PREREQ 
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     dnl PKG_PROG_PKG_CONFIG([MIN-VERSION]) 
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     dnl ---------------------------------- 
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     dnl Since: 0.16 
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     dnl 
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     dnl Search for the pkg-config tool and set the PKG_CONFIG variable to 
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     dnl first found in the path. Checks that the version of pkg-config found 
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     dnl is at least MIN-VERSION. If MIN-VERSION is not specified, 0.9.0 is 
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     dnl used since that's the first version where most current features of 
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     dnl pkg-config existed. 
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     AC_DEFUN([PKG_PROG_PKG_CONFIG], 
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     [m4_pattern_forbid([^_?PKG_[A-Z_]+$]) 
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     m4_pattern_allow([^PKG_CONFIG(_(PATH|LIBDIR|SYSROOT_DIR|ALLOW_SYSTEM_(CFLAGS|LIBS)))?$]) 
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     m4_pattern_allow([^PKG_CONFIG_(DISABLE_UNINSTALLED|TOP_BUILD_DIR|DEBUG_SPEW)$]) 
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     AC_ARG_VAR([PKG_CONFIG], [path to pkg-config utility]) 
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     AC_ARG_VAR([PKG_CONFIG_PATH], [directories to add to pkg-config's search path]) 
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     AC_ARG_VAR([PKG_CONFIG_LIBDIR], [path overriding pkg-config's built-in search path]) 
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     if test "x$ac_cv_env_PKG_CONFIG_set" != "xset"; then 
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     	AC_PATH_TOOL([PKG_CONFIG], [pkg-config]) 
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     fi 
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     if test -n "$PKG_CONFIG"; then 
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     	_pkg_min_version=m4_default([$1], [0.9.0]) 
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     	AC_MSG_CHECKING([pkg-config is at least version $_pkg_min_version]) 
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     	if $PKG_CONFIG --atleast-pkgconfig-version $_pkg_min_version; then 
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     		AC_MSG_RESULT([yes]) 
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     	else 
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     		AC_MSG_RESULT([no]) 
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     		PKG_CONFIG="" 
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     	fi 
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     fi[]dnl 
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     ])dnl PKG_PROG_PKG_CONFIG 
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     PKG_CHECK_MODULES(OPENSSL, [libssl >= 0.9.8 libcrypto >= 0.9.8], [ 
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     			    with_openssl=yes 
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| ... | ... | |
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     AM_CONDITIONAL([COND_WANT_TESTS], [test "$enable_tests" = yes]) 
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     AC_CHECK_FUNC(backtrace_symbols_fd, [ 
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             AC_DEFINE(HAVE_BACKTRACE, [], [Use glibc backtrace on fatal()]) 
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             LDFLAGS="-rdynamic $LDFLAGS" 
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             backtrace="(with backtrace)" 
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     	    AC_DEFINE(HAVE_BACKTRACE, [], [Use glibc backtrace on fatal()]) 
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     	    LDFLAGS="-rdynamic $LDFLAGS" 
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     	    backtrace="(with backtrace)" 
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     ]) 
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