add autotools based build system

configure.ac

@@ -0,0 +1,50 @@
+AC_INIT([librtlsdr],
+        m4_esyscmd([./git-version-gen .tarball-version]),
+        [osmosdr@lists.osmocom.org])
+
+AM_INIT_AUTOMAKE([dist-bzip2])
+
+dnl kernel style compile messages
+m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])
+
+dnl checks for programs
+AC_PROG_MAKE_SET
+AC_PROG_CC
+AC_PROG_INSTALL
+LT_INIT
+AC_PROG_LIBTOOL
+
+PKG_CHECK_MODULES(LIBUSB, libusb-1.0 >= 1.0)
+LIBS="$LIBS $LIBUSB_LIBS"
+CFLAGS="$CFLAGS $LIBUSB_CFLAGS"
+
+AC_PATH_PROG(DOXYGEN,doxygen,false)
+AM_CONDITIONAL(HAVE_DOXYGEN, test $DOXYGEN != false)
+
+AC_CONFIG_MACRO_DIR([m4])
+
+dnl checks for header files
+AC_HEADER_STDC
+AC_CHECK_HEADERS(sys/types.h)
+
+# The following test is taken from WebKit's webkit.m4
+saved_CFLAGS="$CFLAGS"
+CFLAGS="$CFLAGS -fvisibility=hidden "
+AC_MSG_CHECKING([if ${CC} supports -fvisibility=hidden])
+AC_COMPILE_IFELSE([AC_LANG_SOURCE([char foo;])],
+    [ AC_MSG_RESULT([yes])
+      SYMBOL_VISIBILITY="-fvisibility=hidden"],
+      AC_MSG_RESULT([no]))
+CFLAGS="$saved_CFLAGS"
+AC_SUBST(SYMBOL_VISIBILITY)
+
+dnl Generate the output
+AM_CONFIG_HEADER(config.h)
+
+AC_OUTPUT(
+	librtlsdr.pc
+	include/Makefile
+	src/Makefile
+	Makefile
+	Doxyfile
+)