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diff --git a/unit/atf-src/m4/developer-mode.m4 b/unit/atf-src/m4/developer-mode.m4
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+dnl Copyright 2010 Google Inc.
+dnl All rights reserved.
+dnl
+dnl Redistribution and use in source and binary forms, with or without
+dnl modification, are permitted provided that the following conditions are
+dnl met:
+dnl
+dnl * Redistributions of source code must retain the above copyright
+dnl   notice, this list of conditions and the following disclaimer.
+dnl * Redistributions in binary form must reproduce the above copyright
+dnl   notice, this list of conditions and the following disclaimer in the
+dnl   documentation and/or other materials provided with the distribution.
+dnl * Neither the name of Google Inc. nor the names of its contributors
+dnl   may be used to endorse or promote products derived from this software
+dnl   without specific prior written permission.
+dnl
+dnl THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+dnl "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+dnl LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+dnl A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+dnl OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+dnl SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+dnl LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+dnl DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+dnl THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+dnl (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+dnl OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+dnl \file developer-mode.m4
+dnl
+dnl "Developer mode" is a mode in which the build system reports any
+dnl build-time warnings as fatal errors.  This helps in minimizing the
+dnl amount of trivial coding problems introduced in the code.
+dnl Unfortunately, this is not bullet-proof due to the wide variety of
+dnl compilers available and their different warning diagnostics.
+dnl
+dnl When developer mode support is added to a package, the compilation will
+dnl gain a bunch of extra warning diagnostics.  These will NOT be enforced
+dnl unless developer mode is enabled.
+dnl
+dnl Developer mode is enabled when the user requests it through the
+dnl configure command line, or when building from the repository.  The
+dnl latter is to minimize the risk of committing new code with warnings
+dnl into the tree.
+
+
+dnl Adds "developer mode" support to the package.
+dnl
+dnl This macro performs the actual definition of the --enable-developer
+dnl flag and implements all of its logic.  See the file-level comment for
+dnl details as to what this implies.
+AC_DEFUN([KYUA_DEVELOPER_MODE], [
+    m4_foreach([language], [$1], [m4_set_add([languages], language)])
+
+    AC_ARG_ENABLE(
+        [developer],
+        AS_HELP_STRING([--enable-developer], [enable developer features]),,
+        [if test -d ${srcdir}/.git; then
+             AC_MSG_NOTICE([building from HEAD; developer mode autoenabled])
+             enable_developer=yes
+         else
+             enable_developer=no
+         fi])
+
+    #
+    # The following warning flags should also be enabled but cannot be.
+    # Reasons given below.
+    #
+    # -Wold-style-cast: Raises errors when using TIOCGWINSZ, at least under
+    #                   Mac OS X.  This is due to the way _IOR is defined.
+    #
+
+    try_c_cxx_flags="-D_FORTIFY_SOURCE=2 \
+                     -Wall \
+                     -Wcast-qual \
+                     -Wextra \
+                     -Wpointer-arith \
+                     -Wredundant-decls \
+                     -Wreturn-type \
+                     -Wshadow \
+                     -Wsign-compare \
+                     -Wswitch \
+                     -Wwrite-strings"
+
+    try_c_flags="-Wmissing-prototypes \
+                 -Wno-traditional \
+                 -Wstrict-prototypes"
+
+    try_cxx_flags="-Wabi \
+                   -Wctor-dtor-privacy \
+                   -Wno-deprecated \
+                   -Wno-non-template-friend \
+                   -Wno-pmf-conversions \
+                   -Wnon-virtual-dtor \
+                   -Woverloaded-virtual \
+                   -Wreorder \
+                   -Wsign-promo \
+                   -Wsynth"
+
+    if test ${enable_developer} = yes; then
+        try_werror=yes
+        try_c_cxx_flags="${try_c_cxx_flags} -g -Werror"
+    else
+        try_werror=no
+        try_c_cxx_flags="${try_c_cxx_flags} -DNDEBUG"
+    fi
+
+    m4_set_contains([languages], [C],
+                    [KYUA_CC_FLAGS(${try_c_cxx_flags} ${try_c_flags})])
+    m4_set_contains([languages], [C++],
+                    [KYUA_CXX_FLAGS(${try_c_cxx_flags} ${try_cxx_flags})])
+])