Solaris needs -lsocket and -lnsl and does not support gethostbyname2()

With these changes we build and work on solaris

Makefile.in

@@ -2,7 +2,7 @@ prefix = @prefix@
 exec_prefix = @exec_prefix@
 libdir = @libdir@
 bindir = @bindir@
-LIBS="-lpopt"
+LIBS=-lpopt @LIBS@
 CC=gcc
 CFLAGS=-g -O2 -fPIC -Wall -W -I. -I./include "-D_U_=__attribute__((unused))"
 LIBISCSI_OBJ = lib/connect.o lib/crc32c.o lib/discovery.o lib/init.o lib/login.o lib/md5.o lib/nop.o lib/pdu.o lib/scsi-command.o lib/scsi-lowlevel.o lib/socket.o lib/sync.o

configure.ac

@@ -15,9 +15,13 @@ fi
 
 case `uname` in
   Linux*)
+    AC_DEFINE(HAVE_GETHOSTBYNAME2,1,[Whether we have gethostbyname2 or not])
     ;;
   AIX*)
     ;;
+  SunOS)
+    LIBS="$LIBS -lsocket -lnsl"
+    ;;
   *)
     ;;
 esac

lib/socket.c

@@ -84,7 +84,11 @@ iscsi_connect_async(struct iscsi_context *iscsi, const char *portal,
 	if (inet_pton(AF_INET, addr, &sin->sin_addr) != 1) {
 		struct hostent *he;
 
+#ifdef HAVE_GETHOSTBYNAME2
 		he = gethostbyname2(addr, AF_INET);
+#else
+		he = gethostbyname(addr);
+#endif
 		if (he == NULL) {
 			iscsi_set_error(iscsi, "Invalid target:%s  "
 					"Failed to resolve hostname.", addr);