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  see also (this was my starting point):

    http://linux.palemoon.org/help/build

  hardware & OS:

    OpenBSD version 5.8 64-bit (amd64 architecture) is what I used.

    My build system has 4GB of RAM and an equal amount of swap space.

    32-bit OpenBSD has problems accessing enough RAM to link libxul.  This is
    because there is a per process limit of RAM that cannot be overcome.  I
    think it's around ~1GB (?).  I'm not too clear on the details but I know I
    tried and it always failed with a "memory exhausted" error (anyone able to
    get around this problem?)...

  pre-reqs:

    required packages:

      #
      # find your best mirror here:
      #
      #   http://www.openbsd.org/ftp.html
      #
      export PKG_PATH=ftp://ftp3.usa.openbsd.org/pub/OpenBSD/`uname -r`/packages/`machine -a`/
      pkg_add -v -i autoconf-2.13p3 bash dbus-glib g++-4.8.4p2 gmake \
                    gtk+2-2.24.28 p7zip py-virtualenv wget yasm libvpx

    package specific setup:

      ln -sf /usr/local/bin/bash      /bin/bash
      ln -sf /usr/local/bin/python2.7 /usr/local/bin/python

    required X11 OS "sets" (these come on the installation ISO too):

        NOTE: skip this section if you've already installed all X11 sets...
      
      if ! [ -f /usr/X11R6/lib/X11/fonts/misc/10x20.pcf.gz ] ; then
        cd /tmp
          V=$(echo `uname -r` | sed 's/\.//')
          wget -nd ftp://mirror.planetunix.net/pub/OpenBSD/`uname -r`/`machine -a`/xfont$V.tgz
          cd /
            tar xzvphf /tmp/xfont$V.tgz
            /bin/rm -f /tmp/xfont$V.tgz
      fi

      if ! [ -x /usr/X11R6/bin/startx ] ; then
        cd /tmp
          V=$(echo `uname -r` | sed 's/\.//')
          wget -nd ftp://mirror.planetunix.net/pub/OpenBSD/`uname -r`/`machine -a`/xshare$V.tgz
          cd /
            tar xzvphf /tmp/xshare$V.tgz
            /bin/rm -f /tmp/xshare$V.tgz
      fi

  get and extract the PM source:

    mkdir -p ~/tmp/pm/{pmsrc,pmbuild}
    cd       ~/tmp/pm

      #
      # http://www.palemoon.org/sourcecode.shtml
      #
      wget -nd ftp://source:current@ftp.palemoon.org/palemoon-26.1.0-source.7z

      7za x *.7z -o'pmsrc'

      chmod -R +x pmsrc/*

  prep the build system:

    vi build.sh

      #!/bin/bash

      if [ ! -d "pmsrc" ] || [ ! -d "pmbuild" ] || [ ! -f "mozconfig.txt" ] ; then
        echo "Check the directories and files!"
        exit 1
      fi

      cp mozconfig.txt pmsrc/.mozconfig
      cd pmsrc/

      export      CC='egcc'                  # use the updated compiler
      export     CXX='eg++'                  # use the updated compiler
      #xport LDFLAGS='-Wl,--no-keep-memory'  # save RAM while linking

      gmake -f client.mk build &> /dev/stdout | tee buildlog.txt

      if [ ${PIPESTATUS[0]} == 0 ]; then
        cd "../pmbuild"
        gmake package
      fi

    vi mozconfig.txt

      ac_add_options --enable-official-branding
      export MOZILLA_OFFICIAL=1

      mk_add_options MOZ_CO_PROJECT=browser
      ac_add_options --enable-application=browser

      mk_add_options MOZ_OBJDIR=/root/tmp/pm/pmbuild/
      ac_add_options --x-libraries=/usr/X11R6/lib

      ac_add_options --disable-installer
      ac_add_options --disable-updater

      # The internal vpx fails to build with an error similar to (?):
      #   "Assembler messages" "no such instruction" "pinsrq"
      ac_add_options --with-system-libvpx

      ac_add_options --disable-tests
      ac_add_options --disable-mochitests
      ac_add_options --disable-debug

      ac_add_options --disable-necko-wifi
      ac_add_options --disable-webspeech
      ac_add_options --disable-webrtc

      # note: change -O3 to -O2 if using an even newer compiler...
      ac_add_options --enable-optimize="-O3 -msse2 -mfpmath=sse"
      ac_add_options --enable-strip

  gruesome hacks:

      NOTE: these are intended to be quick-and-dirty...  They could form the
            inspiration for some proper diffs in the future, but for now, just
            paste them in (only once as they may not be idempotent)...

    #
    # the build system does not know about OpenBSD...
    #
    [ -f pmsrc/python/psutil/psutil/__init__.py.org ] || \
      cp pmsrc/python/psutil/psutil/__init__.py          \
         pmsrc/python/psutil/psutil/__init__.py.org
    perl -p -i -e 's{freebsd}{openbsd5}' \
      pmsrc/python/psutil/psutil/__init__.py

    #
    # do not use malloc.h on OpenBSD...
    #
    [ -f pmsrc/configure.in.org ] || \
      cp pmsrc/configure.in          \
         pmsrc/configure.in.org
    perl -p -i -e 's{(?<=^MALLOC_HEADERS=").*(?=")}{}' \
      pmsrc/configure.in

    #
    # fix missing defines...
    #
    [ -f pmsrc/js/src/jscpucfg.h.org ] || \
      cp pmsrc/js/src/jscpucfg.h          \
         pmsrc/js/src/jscpucfg.h.org
    perl -n -i -e 'print;'                                              \
               -e ' if ( /include <endian.h>/ ) {'                      \
               -e '  print "# define __BYTE_ORDER BYTE_ORDER\n";'       \
               -e '  print "# define __BIG_ENDIAN BIG_ENDIAN\n";'       \
               -e '  print "# define __LITTLE_ENDIAN LITTLE_ENDIAN\n";' \
               -e '}'                                                   \
      pmsrc/js/src/jscpucfg.h

    #
    # fix missing defines...
    #
    [ -f pmsrc/ipc/chromium/src/base/debug_util_posix.cc.org ] || \
      cp pmsrc/ipc/chromium/src/base/debug_util_posix.cc          \
         pmsrc/ipc/chromium/src/base/debug_util_posix.cc.org
    perl -n -i -e 'print;'                                                      \
               -e ' if ( /P_TRACED flag is set/ ) {'                            \
               -e '  print "#if defined(OS_OPENBSD) && !defined(_P_TRACED)\n";' \
               -e '  print "#define KP_FLAGS p_psflags\n";'                     \
               -e '  print "#define P_TRACED PS_TRACED\n";'                     \
               -e '  print "#endif\n";'                                         \
               -e '}'                                                           \
      pmsrc/ipc/chromium/src/base/debug_util_posix.cc

    #
    # disable some old cruft...
    #
    [ -f pmsrc/ipc/chromium/src/base/dir_reader_bsd.h.org ] || \
      cp pmsrc/ipc/chromium/src/base/dir_reader_bsd.h          \
         pmsrc/ipc/chromium/src/base/dir_reader_bsd.h.org
    perl -p -i -e 's{OS_OPENBSD}{SOME_NOOP}' \
      pmsrc/ipc/chromium/src/base/dir_reader_bsd.h

    #
    # OpenBSD does not have arc4random_addrandom()...
    #
    #   https://bugzilla.mozilla.org/show_bug.cgi?id=931354
    #
    [ -f pmsrc/ipc/chromium/src/third_party/libevent/evutil_rand.c.org ] || \
      cp pmsrc/ipc/chromium/src/third_party/libevent/evutil_rand.c          \
         pmsrc/ipc/chromium/src/third_party/libevent/evutil_rand.c.org
    perl -p -i -e '/arc4random_addrandom/&&print"return;\n"' \
      pmsrc/ipc/chromium/src/third_party/libevent/evutil_rand.c

  start the actual build:

    bash build.sh

  result:

    ls ~/tmp/pm/pmbuild/dist/palemoon-*.en-US.openbsd5.8-x86_64.tar.bz2

  quick install notes (you may choose to do this differently):

    PM_VER=26.1.0

    [ -d /opt ] || mkdir /opt
    cd /opt
      tar xvjf ~/tmp/pm/pmbuild/dist/palemoon-$PM_VER.en-US.openbsd5.8-x86_64.tar.bz2
      mv palemoon palemoon$PM_VER
      ln -sf /opt/palemoon$PM_VER/palemoon /usr/local/bin/palemoon

        NOTE: you can now run /usr/local/bin/palemoon.  Ignore this bogon:

                WARNING: symbol(_ZN11__gnu_debug17_S_debug_messagesE) size mismatch...

                  http://marc.info/?l=openbsd-misc&m=141149797207874