NOTES.UNIX

   1
   2  NOTES FOR UNIX LIKE PLATFORMS
   3  =============================
   4
   5  For Unix/POSIX runtime systems on Windows, please see NOTES.WIN.
   6
   7
   8  Shared libraries and installation in non-standard locations
   9  -----------------------------------------------------------
  10
  11  Binaries on Unix variants expect to find shared libraries in standard
  12  locations, such as /usr/lib, /usr/local/lib and some other locations
  13  configured in the system (for example /etc/ld.so.conf on some systems).
  14  If the libraries are installed in non-standard locations, binaries
  15  will not find them and therefore fail to run unless they get a bit of
  16  help from a defined RPATH or RUNPATH.  This can be applied by adding
  17  the appropriate linker flags to the configuration command, such as
  18  this (/usr/local/ssl was the default location for OpenSSL installation
  19  in versions before 1.1.0):
  20
  21     $ ./config --prefix=/usr/local/ssl --openssldir=/usr/local/ssl \
  22         -Wl,-rpath,/usr/local/ssl/lib
  23
  24  Because the actual library location may vary further (for example on
  25  multilib installations), there is a convenience variable in Makefile
  26  that holds the exact installation directory and that can be used like
  27  this:
  28
  29     $ ./config --prefix=/usr/local/ssl --openssldir=/usr/local/ssl \
  30         -Wl,-rpath,'$(LIBRPATH)'