I am using libao in my C++ code. To set up the build system, I run the autogen.sh script (which uses autoreconf) in the repo. It works, but the os_types.h.in in include/ao/ doesn't get converted to os_types.h.
os_types.h is needed because when I try to include #include <libao/include/ao/ao.h> the compiler says that it cannot open source file "os_types.h" (dependency of "libao/include/ao/ao.h").
Turns out that I needed to run ./configure and then make and I had the os_types.h file. Answer found from: Can't run Makefile.am, what should I do?