$ cat Makefile.am 
SUBDIRS = lib src

$ cat lib/Makefile.am 
lib_LTLIBRARIES = libseom.la
libseom_la_SOURCES = buffer.c client.c codec.c frame.c frames.c server.c stream.c
libseom_la_LDFLAGS = -version-info 0:1:2

$ cat src/*/Makefile.am
AM_CPPFLAGS = -I$(srcdir)/../../lib
bin_PROGRAMS = filter
filter_SOURCES = main.c
filter_LDADD = ../../lib/libseom.la
AM_CPPFLAGS = -I$(srcdir)/../../lib
bin_PROGRAMS = player
filter_SOURCES = main.c
filter_LDADD = ../../lib/libseom.la
AM_CPPFLAGS = -I$(srcdir)/../../lib
bin_PROGRAMS = server
filter_SOURCES = main.c
filter_LDADD = ../../lib/libseom.la