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 How to compile with 64bit arch on 64bit machine: | 
 How to compile with 64bit arch on 64bit machine: | 
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 1) set the PAM_BIT environmental variable to "-m64" | 
 1) set the PAM_BIT environmental variable to "-m64" | 
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 2) enter the directory "event"  | 
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 3) mv Makefile Makefile.orig | 
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 4) mv Makefile.compileon64bitarch Makefile | 
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 5) edit Makefile and set the correct path for these two lines, repeated twice on lines 103/104 and 117/118  | 
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        /usr/lib/gcc/x86_64-redhat-linux/3.4.6/crtbeginS.o \ | 
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        /usr/lib/gcc/x86_64-redhat-linux/3.4.6/crtendS.o \ | 
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 the correct path depends on your setup. | 
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 6) remember to use 64bit external software (ROOT, MySQL, etc.) |