WIP build system cleanups by Nathan Phillip Brink

Makefile.am

@@ -1,5 +1,22 @@
-lib_LIBRARIES = libenet.a
-libenet_a_SOURCES = host.c list.c callbacks.c packet.c peer.c protocol.c unix.c win32.c
+pkgconfigdir = $(libdir)/pkgconfig
+nodist_pkgconfig_DATA = libenet.pc
+
+enetincludedir=$(includedir)/enet
+enetinclude_HEADERS = \
+	include/enet/callbacks.h \
+	include/enet/enet.h \
+	include/enet/list.h \
+	include/enet/protocol.h \
+	include/enet/time.h \
+	include/enet/types.h \
+	include/enet/unix.h \
+	include/enet/utility.h \
+	include/enet/win32.h
+
+lib_LTLIBRARIES = libenet.la
+libenet_la_SOURCES = host.c list.c callbacks.c packet.c peer.c protocol.c unix.c win32.c
+# see info '(libtool) Updating version info' before making a release
+libenet_la_LDFLAGS = $(AM_LDFLAGS) -version-info 0:0:0
 INCLUDES = -Iinclude
 
-SUBDIRS = include
+ACLOCAL_AMFLAGS = -Im4