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 Using RDB Library in C
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 1) Add "interface/c" to the include paths.
 2) Link library "rdblib.dll" or "librdb.so".

Alternative approach with explicit run-time linking:

 1) Add #define RDB_RUNTIME_LINKING
 2) Add "interface/c" to the include paths.
 3) Compile and link "riegl/rdb/library.c".
 4) Linux only: link library "libdl" (-ldl)
 5) Call rdb_library_load() before using any other RDB library function
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