+# Check for posix_fallocate
+AC_CHECK_LIB([c], [posix_fallocate],
+ [AC_DEFINE_UNQUOTED([BABELTRACE_HAVE_POSIX_FALLOCATE], 1, [Has posix_fallocate support.])]
+)
+
+## ##
+## User variables ##
+## ##
+
+AC_ARG_VAR([PYTHON_INCLUDE], [Include flags for Python, bypassing python-config])
+AC_ARG_VAR([PYTHON_LDFLAGS], [Linker flags for Python, bypassing python-config])
+AC_ARG_VAR([PYTHON_CONFIG], [Path to python-config])
+
+# BABELTRACE_PLUGINS_DIR: Plugins directory
+AC_ARG_VAR([BABELTRACE_PLUGINS_DIR], [built-in plugins install directory [LIBDIR/babeltrace2/plugins]])
+AS_IF([test "x$BABELTRACE_PLUGINS_DIR" = x], [BABELTRACE_PLUGINS_DIR='${libdir}/babeltrace2/plugins'])
+
+# BABELTRACE_PLUGIN_PROVIDERS_DIR: Plugin providers directory
+AC_ARG_VAR([BABELTRACE_PLUGIN_PROVIDERS_DIR], [built-in plugin providers install directory [LIBDIR/babeltrace2/plugin-providers]])
+AS_IF([test "x$BABELTRACE_PLUGIN_PROVIDERS_DIR" = x], [BABELTRACE_PLUGIN_PROVIDERS_DIR='${libdir}/babeltrace2/plugin-providers'])
+
+# BABELTRACE_MINIMAL_LOG_LEVEL:
+AC_ARG_VAR([BABELTRACE_MINIMAL_LOG_LEVEL], [Minimal log level for Babeltrace program, library, and plugins (TRACE, DEBUG (default), or INFO)])
+AS_IF([test "x$BABELTRACE_MINIMAL_LOG_LEVEL" = x], [BABELTRACE_MINIMAL_LOG_LEVEL="DEBUG"])
+AS_IF([test "$BABELTRACE_MINIMAL_LOG_LEVEL" != "TRACE" && \
+ test "$BABELTRACE_MINIMAL_LOG_LEVEL" != "DEBUG" && \
+ test "$BABELTRACE_MINIMAL_LOG_LEVEL" != "INFO"],
+ [AC_MSG_ERROR([Invalid BABELTRACE_MINIMAL_LOG_LEVEL value ($BABELTRACE_MINIMAL_LOG_LEVEL): use TRACE, DEBUG, or INFO.])]
+)
+AC_DEFINE_UNQUOTED([BT_MINIMAL_LOG_LEVEL], [BT_LOG_$BABELTRACE_MINIMAL_LOG_LEVEL], [Minimal log level])
+
+# BABELTRACE_DEV_MODE:
+AC_ARG_VAR([BABELTRACE_DEV_MODE], [Set to 1 to enable the Babeltrace developer mode (enables run-time checks for plugin developers)])
+AS_IF([test "x$BABELTRACE_DEV_MODE" = x1], [
+ AC_DEFINE([BT_DEV_MODE], 1, [Babeltrace developer mode])
+], [BABELTRACE_DEV_MODE=0])
+
+# BABELTRACE_DEBUG_MODE:
+AC_ARG_VAR([BABELTRACE_DEBUG_MODE], [Set to 1 to enable the Babeltrace debug mode (enables internal assertions for Babeltrace maintainers)])
+AS_IF([test "x$BABELTRACE_DEBUG_MODE" = x1], [
+ AC_DEFINE([BT_DEBUG_MODE], 1, [Babeltrace debug mode])
+], [BABELTRACE_DEBUG_MODE=0])
+
+
+## ##
+## Optionnal features selection ##
+## ##
+
+# Python bindings
+# Disabled by default
+AC_ARG_ENABLE([python-bindings],
+ [AC_HELP_STRING([--enable-python-bindings], [build the Python bindings])],
+ [], dnl AC_ARG_ENABLE will fill enable_python_bindings with the user choice
+ [enable_python_bindings=unspecified]
+)
+
+# Python bindings documentation
+# Disabled by default
+AC_ARG_ENABLE([python-bindings-doc],
+ [AC_HELP_STRING([--enable-python-bindings-doc], [build the Python bindings documentation])],
+ [], dnl AC_ARG_ENABLE will fill enable_python_bindings_doc with the user choice
+ [enable_python_bindings_doc=no]
+)
+
+# Python plugins
+# Disabled by default
+AC_ARG_ENABLE([python-plugins],
+ [AC_HELP_STRING([--enable-python-plugins], [enable the Python plugins support for the library and converter])]
+ dnl AC_ARG_ENABLE will fill enable_python_plugins with the user choice
+)
+
+# Debug info
+# Enabled by default, except on some platforms
+AC_ARG_ENABLE([debug-info],
+ [AC_HELP_STRING([--disable-debug-info], [disable the debug info support (default on macOS, Solaris and Windows)])],
+ [], dnl AC_ARG_ENABLE will fill enable_debug_info with the user choice
+ [enable_debug_info="$DEFAULT_ENABLE_DEBUG_INFO"]
+)
+
+# API documentation
+# Disabled by default
+AC_ARG_ENABLE([api-doc],
+ [AC_HELP_STRING([--enable-api-doc], [build the HTML API documentation])],
+ [enable_api_doc=$enableval]
+)
+
+# Built-in plugins
+# Disabled by default
+AC_ARG_ENABLE([built-in-plugins],
+ [AC_HELP_STRING([--enable-built-in-plugins], [Statically-link in-tree plug-ins into the babeltrace2 executable])]
+ dnl AC_ARG_ENABLE will fill enable_built_in_plugins with the user choice
+)
+
+# Built-in python plugin support
+# Disabled by default
+AC_ARG_ENABLE([built-in-python-plugin-support],
+ [AC_HELP_STRING([--enable-built-in-python-plugin-support], [Statically-link Python plugin support into the babeltrace library])]
+ dnl AC_ARG_ENABLE will fill enable_built_in_python_plugin_support with the user choice
+)
+
+# Man pages
+# Enabled by default
+AC_ARG_ENABLE([man-pages],
+ [AS_HELP_STRING([--disable-man-pages], [Do not build and install man pages (already built in a distributed tarball])],
+ [], dnl AC_ARG_ENABLE will fill enable_man_pages with the user choice
+ [enable_man_pages=yes]
+)
+
+
+# Set automake variables for optionnal feature conditionnals in Makefile.am
+AM_CONDITIONAL([ENABLE_PYTHON_BINDINGS], [test "x$enable_python_bindings" = xyes])
+AM_CONDITIONAL([ENABLE_PYTHON_BINDINGS_DOC], [test "x$enable_python_bindings_doc" = xyes])
+AM_CONDITIONAL([ENABLE_PYTHON_PLUGINS], [test "x$enable_python_plugins" = xyes])
+AM_CONDITIONAL([ENABLE_DEBUG_INFO], [test "x$enable_debug_info" = xyes])
+AM_CONDITIONAL([ENABLE_API_DOC], [test "x$enable_api_doc" = xyes])
+AM_CONDITIONAL([ENABLE_BUILT_IN_PLUGINS], [test "x$enable_built_in_plugins" = xyes])
+AM_CONDITIONAL([ENABLE_BUILT_IN_PYTHON_PLUGIN_SUPPORT], [test "x$enable_built_in_python_plugin_support" = xyes])
+AM_CONDITIONAL([ENABLE_MAN_PAGES], [test "x$enable_man_pages" = xyes])
+AM_CONDITIONAL([ENABLE_PYTHON_COMMON_DEPS], [test "x$enable_python_bindings" = xyes || test "x$enable_python_plugins" = xyes])
+
+# Set defines for optionnal features conditionnals in the source code
+
+## jgalar: still used?
+AS_IF([test "x$enable_python_plugins" = xyes],
+ [AC_DEFINE([PYTHON_PLUGINS], [1], [Python plugin support.])]
+)
+
+AS_IF([test "x$enable_debug_info" = xyes],
+ [AC_DEFINE([ENABLE_DEBUG_INFO], [1], [Define to 1 if you enable the 'debug info' feature])]
+)
+
+AS_IF([test "x$enable_built_in_plugins" = xyes],
+ [AC_DEFINE([BT_BUILT_IN_PLUGINS], [1], [Define to 1 to register plug-in attributes in static executable sections])]
+)
+
+AS_IF([test "x$enable_built_in_python_plugin_support" = xyes],
+ [AC_DEFINE([BT_BUILT_IN_PYTHON_PLUGIN_SUPPORT], [1], [Define to 1 to register plug-in attributes in static executable sections])]
+)
+
+AS_IF([test "x$enable_debug_info" = xyes],
+ [ENABLE_DEBUG_INFO_VAL=1],
+ [ENABLE_DEBUG_INFO_VAL=0]
+)
+
+AC_SUBST([ENABLE_DEBUG_INFO_VAL])
+
+# Check for conflicting Python related features user choices.
+AS_IF([test "x$enable_python_plugins" = xyes],