+AC_FUNC_STRERROR_R
+AC_C__GENERIC
+AC_C___ATOMIC
+# AC_C_STMT_EXPR
+AC_CHECK_SIZEOF([void *])
+AC_CANONICAL_HOST
+AC_HEADER_MAJOR
+AC_HEADER_RESOLV
+AC_CHECK_HEADERS_ONCE([sys/prctl.h])
+
+AC_CHECK_LIB([cap], [cap_get_proc, cap_set_proc],
+ [AC_CHECK_HEADER(
+ [sys/capability.h],
+ [
+ CAP_LIBS=-lcap
+ AC_DEFINE([HAVE_CAPABILITY], [1], [libcap usability])
+ ]
+ )]
+)
+OPTIONAL_CAP_LIBS="${CAP_LIBS}"
+
+AC_ARG_VAR([SSE_CANDIDATE], [C compiler flags for SSE])
+AS_CASE([$host_cpu],
+ [i?86], [SSE_CANDIDATE="yes"]
+)
+AC_SUBST([SSE_CANDIDATE])
+if test "${SSE_CANDIDATE}" = "yes" -a "${enable_x86_sse}" = "yes"; then
+ opt="-msse2 -mfpmath=sse"
+ AX_CHECK_COMPILE_FLAG($opt, [CFLAGS="$CFLAGS $opt"], [])
+fi