+AC_PROG_SED
+
+# Figure out what compiler warnings we can enable.
+# See config/warnings.m4 for details.
+
+ACX_PROG_CC_WARNING_OPTS([-W -Wall -Wwrite-strings -Wstrict-prototypes \
+ -Wmissing-prototypes -Wold-style-definition \
+ -Wmissing-format-attribute -Wno-overlength-strings])
+ACX_PROG_CC_WARNING_ALMOST_PEDANTIC([-Wno-long-long])
+
+# Only enable with --enable-werror-always until existing warnings are
+# corrected.
+ACX_PROG_CC_WARNINGS_ARE_ERRORS([manual])
+
+# Determine the noncanonical target name, for directory use.
+ACX_NONCANONICAL_TARGET
+
+# Specify the local prefix
+local_prefix=
+AC_ARG_WITH(local-prefix,
+[ --with-local-prefix=DIR specifies directory to put local include],
+[case "${withval}" in
+yes) AC_MSG_ERROR(bad value ${withval} given for local include directory prefix) ;;
+no) ;;
+*) local_prefix=$with_local_prefix ;;
+esac])
+
+# Default local prefix if it is empty
+if test x$local_prefix = x; then
+ local_prefix=/usr/local
+fi