LD_LIBRARY_PATH (UNIX)
DYLD_LIBRARY_PATH (MAC)
SHLIB_PATH (HP-UX)
LIBPATH (AIX)
PKG_CONFIG_PATH
CMAKE_MODULE_PATH
LD_LIBRARY_PATH (UNIX)
DYLD_LIBRARY_PATH (MAC)
SHLIB_PATH (HP-UX)
LIBPATH (AIX)
PKG_CONFIG_PATH
CMAKE_MODULE_PATH