1 files changed, 51 insertions, 0 deletions
diff --git a/scripts/Configure-os.h b/scripts/Configure-os.h
new file mode 100755
index 0000000..ae1ecf9
--- /dev/null
+++ b/scripts/Configure-os.h
@@ -0,0 +1,51 @@
+#! /bin/sh
+
+# Shell script to create a link to the appropriate OS-specific header file.
+
+scripts=../scripts
+
+# Get the OS type, and check that there is a make file for it.
+
+os=`$scripts/os-type -generic` || exit 1
+
+if	test ! -r ../OS/Makefile-$os
+then    echo ""
+	echo "*** Sorry - operating system $os is not supported"
+        echo "*** See OS/Makefile-* for supported systems" 1>&2
+        echo ""
+	exit 1;
+fi
+
+# Ensure there is an OS-specific header file, and link it to os.h. There should
+# always be one if there is a make file for the OS, so its absence is somewhat
+# disastrous.
+
+if	test ! -r ../OS/os.h-$os
+then    echo ""
+	echo "*** Build error: OS/os.h-$os file is missing"
+        echo ""
+	exit 1;
+fi
+rm -f os.h
+
+# In order to accommodate for the fudge below, copy the file instead of
+# symlinking it. Otherwise we pollute the clean copy with the fudge.
+cp -p ../OS/os.h-$os os.h || exit 1
+
+# Special-purpose fudge for older versions of Linux (pre 2.1.15) that
+# use the structure name "options" instead of "ip_options".
+
+if [ "$os" != "Linux" -a "$os" != "Linux-libc5" ] ; then exit 0; fi
+
+grep ip_options /usr/include/linux/ip.h >/dev/null
+if [ $? = 0 ] ; then exit 0; fi
+
+cat >>os.h <<End
+
+/* Fudge added because this Linux doesn't appear to have a definition
+for ip_options in /usr/include/linux/ip.h. */
+
+#define ip_options options
+End
+
+# End of Configure-os.h