via "color-tests" automake option. To disable at runtime,
either set your AM_COLOR_TESTS environment variable to "no",
or provide that on the make check command line.
AC_INIT([nmh], m4_normalize(m4_include([VERSION])), [nmh-workers@nongnu.org])
AC_CONFIG_SRCDIR([h/nmh.h])
AC_CONFIG_HEADER([config.h])
-AM_INIT_AUTOMAKE([-Wall foreign serial-tests subdir-objects 1.12])
+AM_INIT_AUTOMAKE([-Wall color-tests foreign serial-tests subdir-objects 1.12])
AC_CANONICAL_HOST