I don't know why I'm bothering. Sheepluva has a whole new approach in the works.
# Find the Lua library
#
IF(NOT LUA_LIBRARY)
IF(WIN32)
SET(LUA_DEFAULT lua.dll)
ELSE(WIN32)
IF(APPLE)
SET(LUA_DEFAULT lua)
ELSE(APPLE)
#locate the system's lua library
FIND_LIBRARY(LUA_DEFAULT NAMES lua51 lua5.1 lua-5.1 lua PATHS /lib /usr/lib /usr/local/lib /usr/pkg/lib)
#remove the path (fpc doesn't like it - why?)
GET_FILENAME_COMPONENT(LUA_DEFAULT ${LUA_DEFAULT} NAME)
ENDIF(APPLE)
ENDIF(WIN32)
SET(LUA_LIBRARY ${LUA_DEFAULT} CACHE STRING "Lua library to link to; file name without path only!")
UNSET(LUA_DEFAULT)
ENDIF(NOT LUA_LIBRARY)