new file mode 100644
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+++ b/auto/os/linux
@@ -0,0 +1,82 @@
+
+# Copyright (C) Igor Sysoev
+
+
+CORE_INCS="$UNIX_INCS"
+CORE_DEPS="$UNIX_DEPS $LINUX_DEPS"
+CORE_SRCS="$UNIX_SRCS $LINUX_SRCS"
+EVENT_MODULES="$EVENT_MODULES"
+
+PIPE="-pipe"
+
+
+CC_TEST_FLAGS="-D_GNU_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE"
+
+# Linux kernel version
+
+version=`grep "#define LINUX_VERSION_CODE" /usr/include/linux/version.h \
+         | sed -e 's/^.* \(.*\)$/\1/'`
+
+
+# enable the rt signals on Linux 2.2.19 and onward
+
+if [ $version -ge 131609 -o $EVENT_RTSIG = YES ]; then
+    echo " + using rt signals"
+    have=HAVE_RTSIG . auto/have
+    EVENT_MODULES="$EVENT_MODULES $RTSIG_MODULE"
+    CORE_SRCS="$CORE_SRCS $RTSIG_SRCS"
+    EVENT_FOUND=YES
+fi
+
+
+# epoll, EPOLLET version
+
+ngx_func="epoll";
+ngx_func_inc="#include <sys/epoll.h>"
+ngx_func_test="int efd = 0, fd = 1, n;
+               struct epoll_event ee;
+               ee.events = EPOLLIN|EPOLLOUT|EPOLLET;
+               ee.data.ptr = NULL;
+               n = epoll_ctl(efd, EPOLL_CTL_ADD, fd, &ee)"
+. auto/func
+
+if [ $ngx_found = yes ]; then
+    have=HAVE_EPOLL . auto/have
+    have=HAVE_CLEAR_EVENT . auto/have
+    CORE_SRCS="$CORE_SRCS $EPOLL_SRCS"
+    EVENT_MODULES="$EVENT_MODULES $EPOLL_MODULE"
+    EVENT_FOUND=YES
+fi
+
+
+# sendfile()
+
+CC_TEST_FLAGS="-D_GNU_SOURCE"
+ngx_func="sendfile()";
+ngx_func_inc="#include <sys/sendfile.h>"
+ngx_func_test="int s = 0, fd = 1;
+               ssize_t n; off_t off = 0;
+               n = sendfile(s, fd, &off, 1)"
+. auto/func
+
+if [ $ngx_found = yes ]; then
+    CORE_SRCS="$CORE_SRCS $LINUX_SENDFILE_SRCS"
+fi
+
+
+# sendfile64()
+
+CC_TEST_FLAGS="-D_GNU_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE"
+ngx_func="sendfile64()"; . auto/func
+
+
+# prctl(PR_SET_DUMPABLE)
+
+ngx_func="prctl()";
+ngx_func_inc="#include <sys/prctl.h>"
+ngx_func_test="prctl(PR_SET_DUMPABLE, 1, 0, 0, 0)"
+. auto/func
+
+if [ $ngx_found = yes ]; then
+    have=HAVE_PR_SET_DUMPABLE . auto/have
+fi