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; See http://nsis.sourceforge.net/Check_if_a_file_exists_at_compile_time for documentation
!macro !ifexist _FILE_NAME
!tempfile _TEMPFILE
!system `if exist "${_FILE_NAME}" echo !define _FILE_EXISTS > "${_TEMPFILE}"`
!include `${_TEMPFILE}`
!delfile `${_TEMPFILE}`
!undef _TEMPFILE
!ifdef _FILE_EXISTS
!undef _FILE_EXISTS
!macroend
!define !ifexist "!insertmacro !ifexist"
!macro !ifnexist _FILE_NAME
!tempfile _TEMPFILE
!system `if not exist "${_FILE_NAME}" echo !define _FILE_EXISTS > "${_TEMPFILE}"`
!include `${_TEMPFILE}`
!delfile `${_TEMPFILE}`
!undef _TEMPFILE
!ifdef _FILE_EXISTS
!undef _FILE_EXISTS
!macroend
!define !ifnexist "!insertmacro !ifnexist"
!macro !defineifexist _FILE_NAME _VAR_NAME _VAR_VALUE
!tempfile _TEMPFILE
!ifdef NSIS_WIN32_MAKENSIS
; Windows - cmd.exe
!system 'if exist "${_FILE_NAME}" echo !define ${_VAR_NAME} ${_VAR_VALUE} > "${_TEMPFILE}"'
!else
; Posix - sh
!system 'if [ -e "${_FILE_NAME}" ]; then echo "!define ${_VAR_NAME} ${_VAR_VALUE}" > "${_TEMPFILE}"; fi'
!endif
!include '${_TEMPFILE}'
!delfile '${_TEMPFILE}'
!undef _TEMPFILE
!macroend
!define !defineifexist "!insertmacro !defineifexist"
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