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[tmodes <945523@xxxxxxxxxxxxxxxxxx>]

The attached patch fixes several issues with building libpano on Windows:
* It make the current tip to compile again.
* It add a workaround for an issue with CMake which did not correctly set some parameters for static 64-bit builds
* If fixes the mentioned ctags issue
* It adds option to build static or shared lib, with output of messages to commandline or gui (all Windows only)

The implementation adds 2 new files: sys_compat_unix.c and
sys_compat_win.c. The CMake build system is already changed to use the
correct one. This needs also be done for the configure/automake script.

** Patch added: "Patch for compiling under Windows"
   https://bugs.launchpad.net/panotools/+bug/945523/+attachment/3317299/+files/fix_compile_win32.diff

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https://bugs.launchpad.net/bugs/945523

Title:
  Current tip does not compile on windows

Status in Panorama Tools:
  New

Bug description:
  Hg revision 0c73d8794377 does not compile on windows.

  First: There appear several linker errors in the tools by the use of the not standard conform __progname variable:
  error LNK2019: unresolved external symbol __progname referenced in function panoBasenameOfExecutable	pano13.lib(sys_ansi.obj)

  Second: CMake does call ctag-exuberant without to check for existence.
  Wrap it around a find_program

  FIND_PROGRAM(_ctags ctags-exuberant)
  IF(NOT ${_ctags} MATCHES "-NOTFOUND")
      ADD_CUSTOM_COMMAND( OUTPUT ctags POST_BUILD
                          COMMAND ${_ctags} -e *.c *.h tools/*.c
                          WORKING_DIRECTORY ${PROJECT_SOURCE_DIR}/
                          COMMENT "Build TAGS file"
                        )
      ADD_CUSTOM_TARGET( TAGS DEPENDS ctags)
  ENDIF()

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