freebsd: Fixes for the compilation of libosmocore on FreeBSD
alloca.h is not available on FreeBSD, use the default autoconf
function to check for it, there is a complete list[1] of what to
do for using alloca but let us see how far we get with this test.
Include netinet/in.h for the IPv4 and IPv6 socket address. Check
for dlopen in libraries and use this instead of linking -dl.
[1] http://www.gnu.org/s/hello/manual/autoconf/Particular-Functions.html
diff --git a/configure.ac b/configure.ac
index 52ab850..7d8e6dd 100644
--- a/configure.ac
+++ b/configure.ac
@@ -19,6 +19,10 @@
dnl checks for header files
AC_HEADER_STDC
AC_CHECK_HEADERS(execinfo.h sys/select.h sys/socket.h syslog.h ctype.h)
+# for src/conv.c
+AC_FUNC_ALLOCA
+AC_SEARCH_LIBS([dlopen], [dl dld], [LIBRARY_DL="$LIBS";LIBS=""])
+AC_SUBST(LIBRARY_DL)
AC_PATH_PROG(DOXYGEN,doxygen,false)
AM_CONDITIONAL(HAVE_DOXYGEN, test $DOXYGEN != false)