configure.ac

dnl This redefines AC_PROG_CC to a version which errors out instead. This is
dnl because all our tests should be done with the C++ compiler. This should
dnl catch stuff which accidentally uses the C compiler.
AC_DEFUN([AC_PROG_CC], [m4_errprint(__file__:__line__[: Something is trying to use the C compiler. Since this is a C++ project, this should not happen!
])m4_exit(1)])

dnl Needed for AC_PATH_PROGS_FEATURE_CHECK which was added in 2.62
AC_PREREQ([2.62])
dnl Keep the version number in sync with main.h!
AC_INIT([znc], [1.7.x])
LIBZNC_VERSION=1.7
AC_CONFIG_MACRO_DIR([m4])
AC_CONFIG_SRCDIR([src/znc.cpp])
AC_LANG([C++])
AC_CONFIG_HEADERS([include/znc/zncconfig.h])
AH_TOP([#ifndef ZNCCONFIG_H
#define ZNCCONFIG_H])
AH_BOTTOM([#endif /* ZNCCONFIG_H */])

AC_DEFUN([ZNC_AUTO_FAIL], [
	# This looks better in the summary at the end
	$1="not found"
	if test "x$old_$1" != "xauto" ; then
		AC_MSG_ERROR([$2])
	else
		AC_MSG_WARN([$3])
	fi
])

# AC_PROG_CXX sets CXXFLAGS to "-O2 -g" if it is unset which we don't want
CXXFLAGS="$CXXFLAGS "
AC_PROG_CXX
# "Optional" because we want custom error message
AX_CXX_COMPILE_STDCXX_11([noext], [optional])
if test x"$HAVE_CXX11" != x1; then
	AC_MSG_ERROR([Upgrade your compiler. GCC 4.7+ and Clang 3.2+ are known to work.])
fi

appendLib () {
	if test "$LIBS" != ""; then
		LIBS="$LIBS $*"
	else
		LIBS=$*
	fi
}

appendCXX () {
	if test "$CXXFLAGS" != ""; then
		CXXFLAGS="$CXXFLAGS $*"
	else
		CXXFLAGS=$*
	fi
}

appendMod () {
	if test "$MODFLAGS" != ""; then
		MODFLAGS="$MODFLAGS $*"
	else
		MODFLAGS=$*
	fi
}

appendLD () {
	if test "$LDFLAGS" != ""; then
		LDFLAGS="$LDFLAGS $*"
	else
		LDFLAGS=$*
	fi
}

AC_PROG_INSTALL
AC_PROG_GREP
AC_PROG_SED
AC_CANONICAL_HOST
AC_SYS_LARGEFILE
ZNC_VISIBILITY
AC_PATH_PROG([GIT], [git])
PKG_PROG_PKG_CONFIG()

AC_ARG_ENABLE( [debug],
	AS_HELP_STRING([--enable-debug], [enable debugging]),
	[DEBUG="$enableval"],
	[DEBUG="no"])
AC_ARG_ENABLE( [ipv6],
	AS_HELP_STRING([--disable-ipv6], [disable ipv6 support]),
	[IPV6="$enableval"],
	[IPV6="yes"])
AC_ARG_ENABLE( [openssl],
	AS_HELP_STRING([--disable-openssl], [disable openssl]),
	[SSL="$enableval"],
	[SSL="auto"])
AC_ARG_ENABLE( [zlib],
	AS_HELP_STRING([--disable-zlib], [disable zlib]),
	[ZLIB="$enableval"],
	[ZLIB="auto"])
AC_ARG_ENABLE( [perl],
	AS_HELP_STRING([--enable-perl], [enable perl]),
	[PERL="$enableval"],
	[PERL="no"])
AC_ARG_ENABLE( [python],
	AS_HELP_STRING([--enable-python[[[=python3]]]], [enable python.
			By default python3.pc of pkg-config is used, but you can use
			another name, for example python-3.1]),
	[PYTHON="$enableval"],
	[PYTHON="no"])
AC_ARG_ENABLE( [swig],
	AS_HELP_STRING([--enable-swig], [Enable automatic generation of source files needed for modperl/modpython.
			This value is ignored if perl and python are disabled.
			Usually no need to enable it.
			]),
	[USESWIG="$enableval"],
	[USESWIG="auto"])
AC_ARG_ENABLE( [cyrus],
	AS_HELP_STRING([--enable-cyrus], [enable cyrus]),
	[if test "$enableval" = "yes" ; then CYRUS=1; fi],)
AC_ARG_ENABLE( [optimization],
	AS_HELP_STRING([--disable-optimization], [Disable some compiler optimizations to
			decrease memory usage while compiling]),
	[OPTIMIZE="$enableval"],
	[OPTIMIZE="yes"])
AC_ARG_ENABLE( [tdns],
	AS_HELP_STRING([--disable-tdns], [disable threads usage for DNS resolving]),
	[TDNS="$enableval"],
	[TDNS="auto"])
AC_ARG_ENABLE( [run-from-source],
	AS_HELP_STRING([--enable-run-from-source], [ZNC will be runnable without installation]),
	[if test "x$enableval" = "xyes" ; then
		AC_DEFINE([RUN_FROM_SOURCE], [1],
			  [Define if ZNC should be runnable without installation])
	fi
	RUNFROMSOURCE="$enableval"],
	[RUNFROMSOURCE="no"])
AC_ARG_ENABLE( [poll],
	AS_HELP_STRING([--disable-poll], [use select() instead of poll()]),
	[POLL="$enableval"],
	[POLL="yes"])
AC_ARG_WITH( [gtest],
	AS_HELP_STRING([--with-gtest=DIR], [Path to directory with src/gtest-all.cc and src/gtest_main.cc files.
					If not specified, "make test" will download gtest tarball and use it.]))

AC_ARG_WITH([systemdsystemunitdir],
	AS_HELP_STRING([--with-systemdsystemunitdir=DIR], [Directory for systemd service files]),
	[
		if test x"$with_systemdsystemunitdir" = xyes; then
			with_systemdsystemunitdir=$($PKG_CONFIG --variable=systemdsystemunitdir systemd)
		fi
	])
if test "x$with_gtest" != xno; then
	AC_SUBST([GTEST_DIR], [$with_gtest])
fi
if test "x$with_systemdsystemunitdir" != xno; then
	AC_SUBST([systemdsystemunitdir], [$with_systemdsystemunitdir])
fi
AM_CONDITIONAL(HAVE_SYSTEMD, [test -n "$with_systemdsystemunitdir" -a "x$with_systemdsystemunitdir" != xno ])

case "${host_os}" in
	freebsd*)
		# -D__GNU_LIBRARY__ makes this work on fbsd 4.11
		appendCXX -I/usr/local/include -D__GNU_LIBRARY__
		appendLib -L/usr/local/lib -lcompat
		appendMod -L/usr/local/lib
	;;
	solaris*)
		appendLib -lsocket -lnsl -lresolv
		ISSUN=1
	;;
	cygwin)
		# We don't want to use -std=gnu++11 instead of -std=c++11, but among other things, -std=c++11 defines __STRICT_ANSI__ which makes cygwin not to compile: undefined references to strerror_r, to fdopen, to strcasecmp, etc (their declarations in system headers are between ifdef)
		appendCXX -U__STRICT_ANSI__
		ISCYGWIN=1
	;;
	darwin*)
		ISDARWIN=1

		AC_ARG_VAR([USE_SYSTEM_OPENSSL],[set USE_SYSTEM_OPENSSL="true" to use the OpenSSL version provided by Mac OS X. Otherwise the Homebrew installed version is used if available. ])

		AC_PATH_PROG([BREW], [brew])
		if test -n "$BREW"; then
			# add default homebrew paths

			if test "x$HAVE_ICU" != "xno"; then
				AC_MSG_CHECKING([icu4c via homebrew])
				icu4c_prefix=`$BREW --prefix icu4c`
				if test -n "$icu4c_prefix"; then
					export PKG_CONFIG_PATH="$PKG_CONFIG_PATH:$icu4c_prefix/lib/pkgconfig"
					AC_MSG_RESULT([$icu4c_prefix])
				else
					AC_MSG_RESULT([no])
				fi
			fi

			if test "x$PYTHON" != "xno"; then
				brew_python_pc="$PYTHON"
				# This is duplication of non-darwin python logic below...
				if test "x$brew_python_pc" = "xyes"; then
					brew_python_pc="python3"
				fi
				AC_MSG_CHECKING([python3 via homebrew])
				python3_prefix=`$BREW --prefix python3`
				if test -n "$python3_prefix"; then
					python3_prefix=`find "$python3_prefix/" -name $brew_python_pc.pc | head -n1`
					if test -n "$python3_prefix"; then
						python3_prefix=`dirname "$python3_prefix"`
						export PKG_CONFIG_PATH="$PKG_CONFIG_PATH:$python3_prefix"
						AC_MSG_RESULT([$python3_prefix])
					else
						AC_MSG_RESULT([no $brew_python_pc.pc found])
					fi
				else
					AC_MSG_RESULT([no])
				fi
			fi

			if test "x$SSL" != "xno"; then
				AC_MSG_CHECKING([openssl via homebrew])
				if test -z "$USE_SYSTEM_OPENSSL" -o "$USE_SYSTEM_OPENSSL" = "false"; then
					openssl_prefix=`$BREW --prefix openssl`
					if test -n "$openssl_prefix"; then
						export PKG_CONFIG_PATH="$PKG_CONFIG_PATH:$openssl_prefix/lib/pkgconfig"
						AC_MSG_RESULT([$openssl_prefix])
					else
						AC_MSG_RESULT([no])
					fi
				else
					AC_MSG_RESULT([user forced system openssl])
				fi
			fi
		fi
	;;
esac

if test "$DEBUG" != "no"; then
	appendCXX -ggdb3
	AC_DEFINE([_DEBUG], [1], [Define for debugging])
	if test "x$ISCYGWIN" != x1; then
		# These enable some debug options in g++'s STL, e.g. invalid use of iterators
		# But they cause crashes on cygwin while loading modules
		AC_DEFINE([_GLIBCXX_DEBUG], [1], [Enable extra debugging checks in libstdc++])
		AC_DEFINE([_GLIBCXX_DEBUG_PEDANTIC], [1], [Enable extra debugging checks in libstdc++])
	fi
else
	if test "x$OPTIMIZE" = "xyes"; then
		appendCXX -O2

		# In old times needed to define _FORTIFY_SOURCE to 2 ourself.
		# Then GCC started to define it itself to 2. It was ok.
		# But then GCC 4.7 started to define it to 0 or 2 depending on optimization level, and it started to conflict with our define.
		AC_MSG_CHECKING([whether compiler predefines _FORTIFY_SOURCE])
		AC_COMPILE_IFELSE([
			AC_LANG_PROGRAM([[
			]], [[
				#ifndef _FORTIFY_SOURCE
				#error "Just checking, nothing fatal here"
				#endif
			]])
		], [
			AC_MSG_RESULT([yes])
		], [
			AC_MSG_RESULT([no])
			appendCXX "-D_FORTIFY_SOURCE=2"
		])
	fi
fi

if test "$IPV6" != "no"; then
	AC_DEFINE([HAVE_IPV6], [1], [Define if IPv6 support is enabled])
fi

if test "x$GXX" = "xyes"; then
	appendCXX -Wall -W -Wno-unused-parameter -Woverloaded-virtual -Wshadow
fi

if test "$POLL" = "yes"; then
	# poll() is broken on Mac OS, it fails with POLLNVAL for pipe()s.
	if test -n "$ISDARWIN"
	then
		# Did they give us --enable-poll?
		if test -n "$enable_poll"
		then
			# Yes, they asked for this.
			AC_MSG_WARN([poll() is known to be broken on Mac OS X. You have been warned.])
		else
			# No, our default value of "yes" got applied.
			AC_MSG_WARN([poll() is known to be broken on Mac OS X. Using select() instead.])
			AC_MSG_WARN([Use --enable-poll for forcing poll() to be used.])
			POLL=no
		fi
	fi
	if test "$POLL" = "yes"; then
		AC_DEFINE([CSOCK_USE_POLL], [1], [Use poll() instead of select()])
	fi
fi

AC_CHECK_LIB( gnugetopt, getopt_long,)
AC_CHECK_FUNCS([lstat getopt_long getpassphrase])

# ----- Check for dlopen

AC_SEARCH_LIBS([dlopen], [dl], [],
		[AC_MSG_ERROR([Could not find dlopen. ZNC will not work on this box until you upgrade this ancient system or at least install the necessary system libraries.])])

# ----- Check for pthreads

DNS_TEXT=blocking
if test "x$TDNS" != "xno"; then
	old_TDNS=$TDNS
	AX_PTHREAD([
        	AC_DEFINE([HAVE_PTHREAD], [1], [Define if you have POSIX threads libraries and header files.])
		appendCXX "$PTHREAD_CFLAGS"
		appendLib "$PTHREAD_LIBS"
		AC_MSG_CHECKING([whether getaddrinfo() supports AI_ADDRCONFIG])
		AC_COMPILE_IFELSE([
			AC_LANG_PROGRAM([[
				#include <sys/types.h>
				#include <sys/socket.h>
				#include <netdb.h>
			]], [[
				int x = AI_ADDRCONFIG;
				(void) x;
			]])
		], [
			AC_MSG_RESULT([yes])
			TDNS=yes
		], [
			AC_MSG_RESULT([no])
			TDNS=no
			# Note that broken systems, such as OpenBSD, NetBSD, which don't support AI_ADDRCONFIG,
			# also have thread-unsafe getaddrinfo().
		])
	], [
		TDNS=no
	])
	if test "x$TDNS" = "xyes"; then
		DNS_TEXT=threads
		AC_DEFINE([HAVE_THREADED_DNS], [1], [Define if threaded DNS is enabled])
	else
		ZNC_AUTO_FAIL([TDNS],
			[support for threaded DNS not found. Try --disable-tdns.
Disabling it may result in a slight performance decrease but will not have any other side-effects],
			[support for threaded DNS not found, so DNS resolving will be blocking])
	fi
fi

# ----- Check for openssl

SSL_TEXT="$SSL"
if test "x$SSL" != "xno"; then
	old_SSL=$SSL
	PKG_CHECK_MODULES([openssl], [openssl], [
		appendLib "$openssl_LIBS"
		appendCXX "$openssl_CFLAGS"
	], [
		# Don't reorder this!
		# On some arches libssl depends on libcrypto without linking to it :(
		AC_CHECK_LIB( crypto, BIO_new,, SSL=no ; SSL_TEXT="no (libcrypt not found)" )
		AC_CHECK_LIB( ssl, SSL_shutdown,, SSL=no ; SSL_TEXT="no (libssl not found)" )
	])

	if test "x$SSL" != "xno"; then
		AC_MSG_CHECKING([whether openssl is usable])
		AC_LINK_IFELSE([
			AC_LANG_PROGRAM([[
				#include <openssl/ssl.h>
			]], [[
				SSL_CTX* ctx = SSL_CTX_new(TLSv1_method());
				SSL* ssl = SSL_new(ctx);
				DH* dh = DH_new();
				DH_free(dh);
				SSL_free(ssl);
				SSL_CTX_free(ctx);
			]])
		], [
			AC_MSG_RESULT([yes])
		], [
			AC_MSG_RESULT([no])
			SSL=no
			SSL_TEXT="no (openssl not usable)"
		])

	fi

	if test "x$SSL" = "xno" ; then
		ZNC_AUTO_FAIL([SSL],
			[OpenSSL not found. Try --disable-openssl.],
			[OpenSSL was not found and thus disabled])
		NOSSL=1
	else
		AC_DEFINE([HAVE_LIBSSL], [1], [Define if openssl is enabled])
		SSL=yes
		SSL_TEXT=yes
	fi
else
	NOSSL=1
	SSL_TEXT="no (explicitly disabled)"
fi

# ----- Check for zlib

old_ZLIB="$ZLIB"
ZLIB_TEXT="$ZLIB"
if test "x$ZLIB" != "xno"; then
	AC_MSG_CHECKING([whether zlib is usable])
	my_saved_LIBS="$LIBS"
	appendLib "-lz"
	AC_LINK_IFELSE([AC_LANG_PROGRAM([[
			#include "zlib.h"
		]], [[
			z_stream zs;
			(void) deflateInit2(&zs, 0, 0, 0, 0, 0);
			(void) deflate(&zs, 0);
		]])
		], [
			AC_MSG_RESULT([yes])
			ZLIB=yes
			ZLIB_TEXT=yes
		], [
			AC_MSG_RESULT([no])
			ZLIB=no
			ZLIB_TEXT="no (libz not found)"
	])
	if test "x$ZLIB" = "xno"; then
		ZNC_AUTO_FAIL([ZLIB],
			[zlib was not found. Try --disable-zlib],
			[zlib was not found and thus disabled])
		LIBS="$my_saved_LIBS"
	else
		AC_DEFINE([HAVE_ZLIB], [1], [Define if zlib is available])
	fi
fi

AC_ARG_ENABLE( [charset],
	AS_HELP_STRING([--disable-charset], [disable ICU support]),
	[HAVE_ICU="$enableval"],
	[HAVE_ICU="auto"])
if test "x$HAVE_ICU" != "xno"
then
	old_HAVE_ICU="$HAVE_ICU"
	PKG_CHECK_MODULES([icu], [icu-uc], [
		appendLib "$icu_LIBS"
		appendCXX "$icu_CFLAGS"
		HAVE_ICU=yes
		AC_DEFINE([HAVE_ICU], [1], [Enable ICU library for Unicode handling])
		AC_DEFINE([U_USING_ICU_NAMESPACE], [0], [Do not clutter global namespace with ICU C++ stuff])
	], [
		ZNC_AUTO_FAIL([HAVE_ICU],
			      [support for charset conversion not found. Try --disable-charset.],
			      [support for charset conversion not found and thus disabled])
		HAVE_ICU="no (icu-uc not found via pkg-config)"
	])
fi

AC_ARG_WITH( [module-prefix],
	AS_HELP_STRING([--with-module-prefix], [module object code [LIBDIR/znc]]),
	[MODDIR=$withval],
	[MODDIR="${libdir}/znc"] )

AC_ARG_WITH( [module-data-prefix],
	AS_HELP_STRING([--with-module-data-prefix=DIR],
		[static module data (webadmin skins) [DATADIR/znc]]),
	[DATADIR=$withval],
	[DATADIR="${datadir}/znc"] )

appendMod "$CXXFLAGS"
appendMod "$CFLAG_VISIBILITY"

if test -z "$ISSUN" -a -z "$ISDARWIN" -a -z "$ISCYGWIN"; then
	# This is an unknown compiler flag on some OS
	appendLD -Wl,--export-dynamic
fi

if test -z "$ISCYGWIN" ; then
	# cygwin doesn't need -fPIC, everything else does (for modules)
	# warning: -fPIC ignored for target (all code is position independent)
	appendMod -fPIC
else
	# But cygwin does want most of ZNC in a shared lib
	# See https://cygwin.com/ml/cygwin-apps/2015-07/msg00108.html for the reasoning behind the name.
	LIBZNC="cygznc-${LIBZNC_VERSION}.dll"
	LIBZNCDIR="$bindir"
fi

if test -z "$ISDARWIN"; then
	MODLINK="-shared"
else
	# Mac OS X differentiates between shared libs (-dynamiclib)
	# and loadable modules (-bundle).
	MODLINK="-bundle -flat_namespace -undefined suppress"
	# TODO test if -twolevel_namespace and/or
	# -undefined dynamic_lookup work
	# (dynamic_lookup might only work on 10.4 and later)
fi

if test "x$PERL" != xno -o "x$PYTHON" != xno; then
	old_USESWIG="$USESWIG"
	if test "x$USESWIG" != "xno"; then
		AC_PROG_SWIG([3.0.0])
		test -z "$SWIG" && USESWIG=no
		if test "x$USESWIG" = xno -a "x$old_USESWIG" = yes; then
			AC_MSG_ERROR([Could not found appropriate SWIG installation. Check config.log for details.])
		fi
	fi
	if test -r "$srcdir/modules/modperl/ZNC.cpp" -a -r "$srcdir/modules/modpython/_znc_core.cpp"; then
		AC_MSG_NOTICE([modperl/modpython files are found, disabling SWIG])
		USESWIG=no
	fi
	if test "x$USESWIG" = xno; then
		if test ! -r "$srcdir/modules/modperl/ZNC.cpp" -o ! -r "$srcdir/modules/modpython/_znc_core.cpp"; then
			AC_MSG_ERROR([Can not build modperl/modpython. Either install SWIG, or build ZNC from a tarball, or disable modperl/modpython. Check config.log for details.])
		else
			AC_MSG_NOTICE([modperl/modpython files are found, no SWIG needed])
		fi
		USESWIG="not needed"
		SWIG=""
	else
		USESWIG=yes
	fi
else
	if test "x$USESWIG" = "xyes"; then
		AC_MSG_WARN([swig is used only for perl and python, but both are disabled. Disabling swig.])
	fi
	USESWIG='not needed'
fi

PERL_TEXT="$PERL"
if test "x$PERL" != "xno"; then
	old_PERL="$PERL"
	AC_PATH_PROG([PERL_BINARY], [perl], [])
	if test -n "$PERL_BINARY" && eval "$PERL_BINARY -e'use 5.010'"; then
		my_saved_LDFLAGS="$LDFLAGS"
		appendLD `$PERL_BINARY -MExtUtils::Embed -e ccopts -e ldopts`
		AC_CHECK_LIB(perl, perl_alloc,
			     [: No, we do not want autoconf to do sth automatically],
			     PERL="no" ; PERL_TEXT="no (libperl not found)")
		LDFLAGS="$my_saved_LDFLAGS"
	else
		PERL="no"
		PERL_TEXT="no (perl binary not found or too old)"
	fi
	if test "x$PERL" = "xno"; then
		ZNC_AUTO_FAIL([PERL],
			[perl not found. Try --disable-perl.],
			[perl was not found and thus disabled])
		PERL_BINARY=""
	else
		PERL="yes"
		PERL_TEXT="yes"
	fi
fi

PYTHON_TEXT="$PYTHON"
if test "x$PYTHON" != "xno"; then
	# Default value for just --enable-python
	if test "x$PYTHON" = "xyes"; then
		PYTHON="python3"
	fi
	old_PYTHON="$PYTHON"
	if test -z "$PKG_CONFIG"; then
		AC_MSG_ERROR([pkg-config is required for modpython.])
	fi
	PKG_CHECK_MODULES([python], [$PYTHON >= 3.0],, AC_MSG_ERROR([$PYTHON.pc not found or is wrong. Try --disable-python or install python3.]))
	my_saved_LIBS="$LIBS"
	my_saved_CXXFLAGS="$CXXFLAGS"
	appendLib $python_LIBS
	appendCXX $python_CFLAGS
	AC_CHECK_FUNC([Py_Initialize], [], [PYTHON="no" ; PYTHON_TEXT="no (libpython not found)"])
	if test "x$PYTHON" != "xno"; then
		# Yes, modpython depends on perl.
		AC_PATH_PROG([PERL_BINARY], [perl])
		if test -z "$PERL_BINARY"; then
			AC_MSG_ERROR([To compile modpython you need to be able to execute perl scripts. Try --disable-python or install perl.])
		fi
		LIBS="$my_saved_LIBS"
		CXXFLAGS="$my_saved_CXXFLAGS"
	fi
	if test "x$PYTHON" = "xno"; then
		ZNC_AUTO_FAIL([PYTHON],
			[python not found. Try --disable-python.],
			[python was not found and thus disabled])
		PYTHONCFG_BINARY=""
	else
		PYTHON="yes"
		PYTHON_TEXT="yes"
	fi
fi

if test -n "$CYRUS"; then
	AC_CHECK_LIB( sasl2, sasl_server_init,
		[: Dont let autoconf add -lsasl2, Makefile handles that],
		AC_MSG_ERROR([could not find libsasl2. Try --disable-cyrus.]))
fi

# Check if we want modtcl
AC_ARG_ENABLE( [tcl],
	AS_HELP_STRING([--enable-tcl], [enable modtcl]),
	[TCL="$enableval"],
	[TCL="no"])

AC_ARG_WITH( [tcl-flags],
	AS_HELP_STRING([--with-tcl-flags=FLAGS],
		[The flags needed for compiling and linking modtcl]),
	[TCL_FLAGS="$withval"],)

if test x"$TCL" = "xyes"
then
	AC_ARG_WITH( [tcl],
		AS_HELP_STRING([--with-tcl=DIR],
			[directory containing tclConfig.sh]),
			TCL_DIR="${withval}")

	# This will need to be extended in the future, but I don't think
	# it's a good idea to stuff a shitload of random stuff in here right now
	for path in $TCL_DIR /usr/lib /usr/lib/tcl8.4 /usr/lib/tcl8.5 /usr/lib/tcl8.6
	do
		file="${path}/tclConfig.sh"
		AC_MSG_CHECKING([for ${file}])
		if test -r ${file}
		then
			TCL_CONF=${file}
			AC_MSG_RESULT([yes])
			break
		fi
		AC_MSG_RESULT([no])
	done

	if test x"${TCL_CONF}" = x
	then
		# They --enable-tcl'd, so give them some sane default
		TCL_FLAGS="-I/usr/include/tcl -ltcl"
		AC_MSG_WARN([Could not find tclConfig.sh, using some sane defaults.])
	else
		AC_MSG_CHECKING([modtcl flags])
		. ${TCL_CONF}
		# eval because those vars depend on other vars in there
		eval "TCL_LIB_SPEC=\"${TCL_LIB_SPEC}\""
		eval "TCL_INCLUDE_SPEC=\"${TCL_INCLUDE_SPEC}\""
		TCL_FLAGS="$TCL_INCLUDE_SPEC $TCL_LIB_SPEC"
		AC_MSG_RESULT([$TCL_FLAGS])
	fi
	my_saved_LIBS="$LIBS"
	appendLib "$TCL_FLAGS"
	AC_CHECK_FUNC([Tcl_CreateInterp], [TCL_TEST=yes], [TCL_TEST=no])
	if test x"$TCL_TEST" = "xno"; then
		AC_MSG_ERROR([tcl not found, try --disable-tcl, or install tcl properly. If tcl is installed to a non-standard path, use --enable-tcl --with-tcl=/path])
	fi
	LIBS="$my_saved_LIBS"
fi

AC_CACHE_CHECK([for GNU make], [ac_cv_path_GNUMAKE], [
	AC_PATH_PROGS_FEATURE_CHECK([GNUMAKE], [make gmake], [[
			if $ac_path_GNUMAKE --version | $GREP GNU > /dev/null; then
				ac_cv_path_GNUMAKE=$ac_path_GNUMAKE
				ac_path_GNUMAKE_found=:
			fi
		]], [AC_MSG_ERROR([could not find GNU make])]
	)
])
GNUMAKE=`echo $ac_cv_path_GNUMAKE | $SED "s%.*/%%"`

# this is in the end, for not trying to include it when it doesn't exist yet
appendCXX "-include znc/zncconfig.h"
appendMod "-include znc/zncconfig.h"

AC_SUBST([CXXFLAGS])
AC_SUBST([CPPFLAGS])
AC_SUBST([MODFLAGS])
AC_SUBST([LDFLAGS])
AC_SUBST([LIBS])
AC_SUBST([LIBZNC])
AC_SUBST([LIBZNCDIR])
AC_SUBST([LIBZNC_VERSION])
AC_SUBST([ISCYGWIN])
AC_SUBST([MODLINK])
AC_SUBST([NOSSL])
AC_SUBST([TCL_FLAGS])
AC_SUBST([CYRUS])
AC_SUBST([MODDIR])
AC_SUBST([DATADIR])
AC_SUBST([PERL])
AC_SUBST([PYTHON])
AC_SUBST([SWIG])
AC_SUBST([python_CFLAGS])
AC_SUBST([python_LIBS])
AC_CONFIG_FILES([Makefile])
AC_CONFIG_FILES([znc-buildmod])
AC_CONFIG_FILES([man/Makefile])
AC_CONFIG_FILES([znc.pc])
AC_CONFIG_FILES([znc-uninstalled.pc])
AC_CONFIG_FILES([modules/Makefile])
AC_OUTPUT

if test "x$ISCYGWIN" = x1; then
		# Side effect of undefining __STRICT_ANSI__
		# http://llvm.org/bugs/show_bug.cgi?id=13530
		echo                                 >> include/znc/zncconfig.h
		echo '#ifndef ZNCCONFIG_H_ADDITIONS' >> include/znc/zncconfig.h
		echo '#define ZNCCONFIG_H_ADDITIONS' >> include/znc/zncconfig.h
		echo '#ifdef __clang__'              >> include/znc/zncconfig.h
		echo 'struct __float128;'            >> include/znc/zncconfig.h
		echo '#endif'                        >> include/znc/zncconfig.h
		echo '#endif'                        >> include/znc/zncconfig.h
fi

echo
echo ZNC AC_PACKAGE_VERSION configured
echo
echo "prefix:       $prefix"
echo "debug:        $DEBUG"
echo "ipv6:         $IPV6"
echo "openssl:      $SSL_TEXT"
echo "dns:          $DNS_TEXT"
echo "perl:         $PERL_TEXT"
echo "python:       $PYTHON_TEXT"
echo "swig:         $USESWIG"
if test x"$CYRUS" = "x" ; then
	echo "cyrus:        no"
else
	echo "cyrus:        yes"
fi
if test x"$TCL_FLAGS" = "x" ; then
	echo "tcl:          no"
else
	echo "tcl:          yes"
fi
echo "charset:      $HAVE_ICU"
echo "zlib:         $ZLIB_TEXT"
echo "run from src: $RUNFROMSOURCE"
echo
echo "Now you can run \"$GNUMAKE\" to compile ZNC"