From Travis logs:
No output has been received in the last 10m0s, this potentially indicates a stalled build or something wrong with the build itself.

Check the details on how to adjust your build configuration on: https://docs.travis-ci.com/user/common-build-problems/#Build-times-out-because-no-output-was-received

OCTET_STRING.c:1896:46: error: signed and unsigned type in conditional expression [-Werror=sign-compare]

oer_support.c:38:22: error: comparison between signed and unsigned integer expressions [-Werror=s

constr_SEQUENCE.c:1438:24: error: signed and unsigned type in conditional expression [-Werror=sign-compare]

NativeReal.c:366:13: error: dereferencing type-punned pointer will break strict-aliasing rules [-Werror=strict-aliasing]
NativeReal.c:370:13: error: dereferencing type-punned pointer will break strict-aliasing rules [-Werror=strict-aliasing]

BIT_STRING.c:494:45: error: signed and unsigned type in conditional expression [-Werror=sign-compare]
BIT_STRING.c:580:46: error: signed and unsigned type in conditional expression [-Werror=sign-compare]

error: ISO C90 does not support the ‘z’ gnu_printf length modifier

This fixes the following error
/usr/include/features.h:374:25: fatal error: sys/cdefs.h: No such file or directory

From `man bash`
The return status of a pipeline is the exit status of the last command, unless the pipefail option is enabled.  If pipefail is enabled, the
pipeline's return status is the value of the last (rightmost) command to exit with a non-zero status, or zero if all commands exit success‐
fully.

- Do not tail the check output as the test log is now written in
  test-suit.log files
- On failure display the whole content of every test-suite.log file found
  in the build directory and exit with 1

fix issue #220: implicit declaration of function ‘isatty’

Fixes warning:
converter-example.c: In function ‘main’:
converter-example.c:400:8: warning: implicit declaration of function ‘isatty’ [-Wimplicit-function-declaration]
     if(isatty(1)) {
        ^