$ perl ppport.h --patch=the.patch
Scanning ./BeginLift.xs ...
=== Analyzing ./BeginLift.xs ===
Uses INT2PTR, which depends on PTRV
Uses PTR2IV, which depends on INT2PTR, PTRV
Uses SvREFCNT_inc, which depends on PL_Sv, SvREFCNT
Uses aTHX
Uses aTHX_
Uses newRV_inc, which depends on newRV
Uses pTHX_
*** WARNING: Uses LINKLIST, which may not be portable below perl 5.13.6, even with 'ppport.h'
*** WARNING: Uses sv_derived_from, which may not be portable below perl 5.004, even with 'ppport.h'
Needs to include 'ppport.h'
Analysis completed (2 warnings)