EXPERIMENTAL pkgsrc -current snapshot for AIX 7.2  
(should also work for other AIX versions 5.x , 6,x , 7,x) 

binary pkg.tar.gz pkgsrc bootstrap (COFF 32bit) needs to be extracted to 
/usr/    

mv pkg.tar.gz /usr
cd /usr
gunzip pkg.tar.gz 
tar -xvf pkg.tar 

Then set the pkgsrc environment paths 

/usr/pkg/bin 
/usr/pkg/sbin 

Also some packages I have built are in All