Add various #if HAVE_- for headers

diff --git a/src/spipe.c b/src/spipe.c
index f42c8f1..52c922a 100644 (file)
--- a/src/spipe.c
+++ b/src/spipe.c
@@ -49,10 +49,18 @@
 #include <sys/socket.h>
 #endif
 
+#if HAVE_NETINET_IN_H
 #include <netinet/in.h>
+#endif
+#if HAVE_NETDB_H
 #include <netdb.h>
+#endif
+#if HAVE_ARPA_INET_H
 #include <arpa/inet.h>
+#endif
+#if HAVE_NETINET_TCP_H
 #include <netinet/tcp.h>
+#endif
 
 struct yaz_spipe {
     int m_fd[2];