I got reply as below:
"
Unfortunately ltp-imx package is not supported by Freescale for i.MX6 platform.
Sorry for the inconvenience.
The package ltp-imx was used for early i.MX series, such as i.MX35,51.
Then it was replaced with OBDS - i.MX50,53,28.
"
for mx6, one can use SDK which includes OBDS.