***** aclocal *****
***** PWD: /var/tmp/portage/dev-libs/hidapi-0.8.0_rc1_p20140719/work/hidapi-d17db57b9d4354752e0af42f5f33007a42ef2906
***** aclocal -I m4

configure.ac:23: error: AC_CONFIG_MACRO_DIR can only be used once
./lib/autoconf/general.m4:1849: AC_CONFIG_MACRO_DIR is expanded from...
configure.ac:23: the top level
autom4te-2.70_beta2: error: /usr/bin/m4 failed with exit status: 1
aclocal-1.16: error: echo failed with exit status: 1