Replace "echo -en" with "printf" in autoconf script Fixes summary output on FreeBSD.
diff --git a/configure.ac b/configure.ac
index 950a488..cad9674 100644
--- a/configure.ac
+++ b/configure.ac
@@ -4597,6 +4597,6 @@ if test x$WARN_ABOUT_ARM_NEON_ASM_MIT = xyes; then
SUMMARY="${SUMMARY}\n --disable-arm-neon\n"
fi
-AC_CONFIG_COMMANDS([summary], [echo -en "$SUMMARY"], [SUMMARY="$SUMMARY"])
+AC_CONFIG_COMMANDS([summary], [printf "$SUMMARY"], [SUMMARY="$SUMMARY"])
AC_OUTPUT