How to compile CUSTOM.pll in R12, below is the command.

How to compile CUSTOM.pll in R12, below is the command.
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frmcmp_batch module=CUSTOM.pll userid=apps/<pwd> output_file=CUSTOM.plx module_type=LIBRARY batch=yes compile_all=special

Path for CUSTOM.pll:
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$AU_TOP/resource

Background
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The CUSTOM library allows extension of Oracle E-Business Suite without modification of Oracle E-Business Suite code.

Comparison between CUSTOM.pll and Form personalization s
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http://pboracletechnical.blogspot.com/2013/03/forms-personalization-and-custompll.html


For more information on CUSTOM.pll check the below link.
http://docs.oracle.com/cd/E18727_01/doc.121/e12897/T302934T458265.htm