TCLTLS_SSL_CFLAGS="`"${PKGCONFIG}" openssl --cflags-only-other $pkgConfigExtraArgs`" || AC_MSG_ERROR([Unable to get OpenSSL Configuration])
	fi
	if test -z "$TCLTLS_SSL_CPPFLAGS"; then
		TCLTLS_SSL_CPPFLAGS="`"${PKGCONFIG}" openssl --cflags-only-I $pkgConfigExtraArgs`" || AC_MSG_ERROR([Unable to get OpenSSL Configuration])
	fi
	PKG_CONFIG_PATH="${PKG_CONFIG_PATH_SAVE}"


	dnl Disable support for TLS 1.0 protocol
	AC_ARG_ENABLE([tls1], AS_HELP_STRING([--disable-tls1], [disable TLS1 protocol]), [
		if test "${enableval}" = "no"; then
			AC_DEFINE([NO_TLS1], [1], [Disable TLS1 protocol])
		fi
	])

	dnl Disable support for TLS 1.1 protocol
	AC_ARG_ENABLE([tls1_1], AS_HELP_STRING([--disable-tls1_1], [disable TLS1.1 protocol]), [
		if test "${enableval}" = "no"; then
			AC_DEFINE([NO_TLS1_1], [1], [Disable TLS1.1 protocol])
		fi
	])

	dnl Disable support for TLS 1.2 protocol
	AC_ARG_ENABLE([tls1_2], AS_HELP_STRING([--disable-tls1_2], [disable TLS1.2 protocol]), [
		if test "${enableval}" = "no"; then
			AC_DEFINE([NO_TLS1_2], [1], [Disable TLS1.2 protocol])
		fi
	])

	dnl Disable support for TLS 1.3 protocol
	AC_ARG_ENABLE([tls1_3], AS_HELP_STRING([--disable-tls1_3], [disable TLS1.3 protocol]), [
		if test "${enableval}" = "no"; then
			AC_DEFINE([NO_TLS1_3], [1], [Disable TLS1.3 protocol])
		fi
	])


	dnl Enable support for building the same library every time
	tcltls_deterministic='false'
	AC_ARG_ENABLE([deterministic], AS_HELP_STRING([--enable-deterministic], [enable deterministic DH parameters]), [
		if test "$enableval" = "yes"; then
			tcltls_deterministic='true'
		fi
	])
	if test "$tcltls_deterministic" = 'true'; then
		GEN_DH_PARAMS_ARGS='fallback'
	else
		GEN_DH_PARAMS_ARGS=''
	fi

	dnl Enable support for specifying pre-computed DH params size
	AC_ARG_WITH([builtin-dh-params-size], AS_HELP_STRING([--with-builtin-dh-params-size=<bits>], [specify the size of the built-in, precomputed, DH params]), [
		AS_CASE([$withval],[2048|4096|8192],,[AC_MSG_ERROR([Unsupported DH params size: $withval])])
		GEN_DH_PARAMS_ARGS="${GEN_DH_PARAMS_ARGS} bits=$withval"
	])
	AC_SUBST(GEN_DH_PARAMS_ARGS)


	dnl Determine if we have been asked to use a fast path if possible
	tcltls_ssl_fastpath='no'
	AC_ARG_ENABLE([ssl-fastpath], AS_HELP_STRING([--enable-ssl-fastpath], [enable using the underlying file descriptor for talking directly to the SSL library]), [
		if test "$enableval" = 'yes'; then
			tcltls_ssl_fastpath='yes'
		else
			tcltls_ssl_fastpath='no'
		fi
	])

	if test "$tcltls_ssl_fastpath" = 'yes'; then
		AC_DEFINE(TCLTLS_SSL_USE_FASTPATH, [1], [Define this to enable using the underlying file descriptor for talking directly to the SSL library])
	fi

	dnl Enable hardening
	AC_MSG_CHECKING([enable hardening])
	tcltls_enable_hardening='yes'
	AC_ARG_ENABLE([hardening], AS_HELP_STRING([--disable-hardening], [enable hardening attempts]), [
		tcltls_enable_hardening="$enableval"
	])
	AC_MSG_RESULT([$tcltls_enable_hardening])
	if test "$tcltls_enable_hardening" = 'yes'; then
		if test "$GCC" = 'yes' -o "$CC" = 'clang'; then
			TEA_ADD_CFLAGS([-fstack-protector-all])
			TEA_ADD_CFLAGS([-fno-strict-overflow])
			AC_DEFINE([_FORTIFY_SOURCE], [2], [Enable fortification])
		fi
	fi


	dnl Determine if we have been asked to statically link to the SSL library
	TCLEXT_TLS_STATIC_SSL='no'
	AC_ARG_ENABLE([static-ssl], AS_HELP_STRING([--enable-static-ssl], [enable statically linking to the specified SSL library]), [
		if test "$enableval" = 'yes'; then
			TCLEXT_TLS_STATIC_SSL='yes'
		fi
	])

	if test "${SHARED_BUILD}" != "1"; then
		dnl If we are doing a static build, save the linker flags for other programs to consume
		rm -f tcltls.${AREXT}.linkadd
		AS_ECHO(["$TCLTLS_SSL_LIBS"]) > tcltls.${AREXT}.linkadd
	fi

	dnl If we have been asked to statically link to the SSL library, specifically tell the linker to do so