AC_MSG_CHECKING([for ssl.h])
			AC_MSG_RESULT([yes])
		else
			AC_MSG_CHECKING([for ssl.h])
			AC_MSG_RESULT([no])
			AC_MSG_ERROR([Unable to locate ssl.h])
		fi
	else
		TCLTLS_SSL_CFLAGS="-I${includedir}/openssl"
		TCLTLS_SSL_INCLUDES="-I${includedir}/openssl"
	fi

	dnl Set SSL lib files path
	AC_ARG_WITH([openssl-libdir],
		AS_HELP_STRING([--with-openssl-libdir=<dir>],
			[path to lib directory of OpenSSL or LibreSSL installation]
		), [

	AC_MSG_RESULT($openssllibdir)

	dnl Set SSL lib vars
	if test ! -z "$openssllibdir"; then
		if test -f "$openssllibdir/libssl${SHLIB_SUFFIX}"; then
			if test "${TCLEXT_TLS_STATIC_SSL}" == 'no'; then
				TCLTLS_SSL_LIBS="-L$openssllibdir -lcrypto -lssl"
			else
			#else
				# Linux and Solaris
				TCLTLS_SSL_LIBS="-Wl,-Bstatic `$PKG_CONFIG --static --libs crypto ssl` -Wl,-Bdynamic"
				#TCLTLS_SSL_LIBS="-Wl,-Bstatic `$PKG_CONFIG --static --libs crypto ssl` -Wl,-Bdynamic"
				# HPUX
				# -Wl,-a,archive ... -Wl,-a,shared_archive
			fi
		else
			AC_MSG_ERROR([Unable to locate libssl${SHLIB_SUFFIX}])
		fi
	else
		TCLTLS_SSL_LIBS="-lcrypto -lssl"
	fi


	dnl Include config variables in --help list and make available to be substituted via AC_SUBST.
	AC_ARG_VAR([TCLTLS_SSL_CFLAGS], [C compiler flags for OpenSSL or LibreSSL])
	AC_ARG_VAR([TCLTLS_SSL_INCLUDES], [C compiler include paths for OpenSSL or LibreSSL])
	AC_ARG_VAR([TCLTLS_SSL_LIBS], [libraries to pass to the linker for OpenSSL or LibreSSL])


	dnl Set location of pkgconfig files
	AC_ARG_WITH([openssl-pkgconfig],
		AS_HELP_STRING([--with-openssl-pkgconfig=<dir>],
			[path to root directory of OpenSSL or LibreSSL pkgconfigdir]
			[path to pkgconfigdir directory for OpenSSL or LibreSSL]
		), [
			opensslpkgconfigdir="$withval"
		], [
			if test -d ${libdir}/../pkgconfig; then
				opensslpkgconfigdir="$libdir/../pkgconfig"
			else
			opensslpkgconfigdir=''
				opensslpkgconfigdir=''
			fi
		]
	)
	AC_MSG_CHECKING([for OpenSSL pkgconfig])
	AC_MSG_RESULT($opensslpkgconfigdir)


	# Use Package Config tool to get config

		dnl Temporarily update PKG_CONFIG_PATH
		PKG_CONFIG_PATH_SAVE="${PKG_CONFIG_PATH}"
		if test -n "${opensslpkgconfigdir}"; then
			if ! test -f "${opensslpkgconfigdir}/openssl.pc"; then
				AC_MSG_ERROR([Unable to locate ${opensslpkgconfigdir}/openssl.pc])
			fi

			PKG_CONFIG_PATH="${opensslpkgconfigdir}${PATH_SEPARATOR}${PKG_CONFIG_PATH}"
			PKG_CONFIG_PATH="${opensslpkgconfigdir}:${PKG_CONFIG_PATH}"
			export PKG_CONFIG_PATH
		fi
		if test -z "$TCLTLS_SSL_LIBS"; then
			TCLTLS_SSL_LIBS="`"${PKG_CONFIG}" openssl --libs $pkgConfigExtraArgs`" || AC_MSG_ERROR([Unable to get OpenSSL Configuration])
		fi
		if test -z "$TCLTLS_SSL_CFLAGS"; then
			TCLTLS_SSL_CFLAGS="`"${PKG_CONFIG}" openssl --cflags-only-other $pkgConfigExtraArgs`" || AC_MSG_ERROR([Unable to get OpenSSL Configuration])
		fi
		if test -z "$TCLTLS_SSL_INCLUDES"; then
			TCLTLS_SSL_INCLUDES="`"${PKG_CONFIG}" openssl --cflags-only-I $pkgConfigExtraArgs`" || AC_MSG_ERROR([Unable to get OpenSSL Configuration])
		fi
		PKG_CONFIG_PATH="${PKG_CONFIG_PATH_SAVE}"
	fi


	dnl Fallback settings for OpenSSL includes and libs
	if test -z "$TCLTLS_SSL_LIBS"; then
		TCLTLS_SSL_LIBS="-lcrypto -lssl"
	fi
	if test -z "$TCLTLS_SSL_CFLAGS"; then
		TCLTLS_SSL_CFLAGS=""
	fi
	if test -z "$TCLTLS_SSL_INCLUDES"; then
		if test -d /usr/include/openssl; then
			TCLTLS_SSL_INCLUDES="-I/usr/include/openssl"
		else
			TCLTLS_SSL_INCLUDES="-I/usr/include"
		fi
	fi

	dnl Include config variables in --help list and make available to be substituted via AC_SUBST.
	AC_ARG_VAR([TCLTLS_SSL_CFLAGS], [C compiler flags for OpenSSL or LibreSSL])
	AC_ARG_VAR([TCLTLS_SSL_INCLUDES], [C compiler include paths for OpenSSL or LibreSSL])
	AC_ARG_VAR([TCLTLS_SSL_LIBS], [libraries to pass to the linker for OpenSSL or LibreSSL])
])