autoreconf errors: possibly undefined macro

[silhouette]

When using the installation from README on ubuntu 18.04, autoreconf reports several errors and ./configure fails afterwards:

$ autoreconf --install
configure.ac:37: error: possibly undefined macro: AC_CHECK_HEADERS
If this token and others are legitimate, please use m4_pattern_allow.
See the Autoconf documentation.
configure.ac:59: error: possibly undefined macro: AC_DEFINE
configure.ac:69: error: possibly undefined macro: AC_SEARCH_LIBS
autoreconf: /usr/bin/autoconf failed with exit status: 1

Autoreconf should run without errors or the requirements should be reviewed.

[nils-ohlmeier]

Sorry for the late reply.

I think I ran into the same or similar issue recently when trying to build on a new machine. It turned out that I didn't have automake installed on that machine. I just added that requirement to the README.