Index: configure.ac
==================================================================
--- configure.ac
+++ configure.ac
@@ -1207,12 +1207,23 @@
 		AC_MSG_RESULT(no)
 	])
 	OBJCFLAGS="$old_OBJCFLAGS"
 ])
 
-AC_CHECK_HEADERS(fcntl.h dirent.h)
-AC_CHECK_FUNCS([sysconf gmtime_r localtime_r nanosleep fcntl])
+AC_CHECK_HEADERS(dirent.h)
+AC_CHECK_FUNCS([sysconf gmtime_r localtime_r nanosleep])
+
+case "$host_os" in
+amigaos* | morphos*)
+	dnl There is a symbol, but we cannot use fcntl() for sockets on
+	dnl AmigaOS / MorphOS.
+	;;
+*)
+	AC_CHECK_HEADERS(fcntl.h)
+	AC_CHECK_FUNCS(fcntl)
+	;;
+esac
 
 AC_CHECK_HEADERS(xlocale.h)
 AC_CHECK_FUNCS([strtod_l strtof_l asprintf_l])
 AS_IF([test x"$gnu_source" != x"yes" -a \( \
     x"$ac_cv_func_strtod_l" = x"yes" -o x"$ac_cv_func_strtof_l" = x"yes" -o \