possibly undefined macro: AC_MSG_ERROR

It is recommended to use autoreconf -fi instead of manually calling aclocal;autoconf;automake; #and whatever else to properly populate aclocal.m4 and so on.

Adding ACLOCAL_AMFLAGS = -I m4 (to the toplevel Makefile.am) and AC_CONFIG_MACRO_DIR([m4]) is currently still optional if you do not use any own m4 files, but of course, doing it will silence the proocess :)

I had this same issue and found that pkg-config package was missing.