@@ -19,11 +19,13 @@
 /* Work around __block being used by glibc */
 #ifdef __GLIBC__
 # undef __USE_XOPEN
 #endif
 
-#include <unistd.h>
+#ifdef HAVE_UNISTD_H
+# include <unistd.h>
+#endif
 
 #ifdef HAVE_ARPA_INET_H
 # include <arpa/inet.h>
 #endif
 #ifdef HAVE_NETDB_H