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[exim.git] / src / scripts / Configure-os.h

diff --git a/src/scripts/Configure-os.h b/src/scripts/Configure-os.h
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+#! /bin/sh
+# $Cambridge: exim/src/scripts/Configure-os.h,v 1.1 2004/10/06 15:07:40 ph10 Exp $
+
+# 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-$os file is missing"
+        echo ""
+       exit 1;
+fi
+rm -f os.h
+ln -s ../OS/os.h-$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