hi,

external/libhpdf/Makefile

 39 ifeq ($(HB_XBUILD),)
 40 HB_INC_LIBPNG = /usr/include

is there any reason for explicitly specifying /usr/include here? it'll 
be picked up by the compiler anyway, but now i've found a case where 
it _might_ cause some level of harm - probably not in hpdf, though, 
anyway.

i see it's to check for the presence of png.h, and such techniques are 
used elsewhere too. would filtering /usr/include out of the include 
list be too cumbersome?

-- 
[-]

mkdir /nonexistent
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