[mrtg] still won't compile

[Anthony Roque Adriano]

i'm trying to compile gd 1.6.3,  already compiled libpng 1.0.3 and zlib
1.1.3,  but everytime i'm doing so i'm getting this error ;

updating cache ./config.cache
loading cache ./config.cache
checking for a BSD compatible install... /usr/bin/install -c
checking for main in -lm... yes
checking for main in -lz... yes
checking for main in -lpng... no
configure: error: libpng not found.

is there a special directory that libpng need to be located....... ?

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