Index: configure.ac
==================================================================
--- configure.ac
+++ configure.ac
@@ -928,10 +928,11 @@
 		AC_MSG_RESULT(no)
 	])
 	OBJCFLAGS="$old_OBJCFLAGS"
 ])
 
+AC_CHECK_HEADERS(fcntl.h)
 AC_CHECK_FUNCS([sysconf gmtime_r localtime_r nanosleep fcntl])
 
 AC_CHECK_HEADERS(xlocale.h)
 AC_CHECK_FUNCS([strtod_l strtof_l asprintf_l])
 

Index: src/OFStream.m
==================================================================
--- src/OFStream.m
+++ src/OFStream.m
@@ -23,11 +23,13 @@
 #include <stdarg.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 
-#include <fcntl.h>
+#ifdef HAVE_FCNTL_H
+# include <fcntl.h>
+#endif
 
 #include "platform.h"
 
 #ifndef OF_WINDOWS
 # include <signal.h>