https://code.zmaw.de/boards/2/topics/895
to add --without-jni, so it is
./configure --prefix=/home1/username/proj --without-jni
in the downloaded and extracted proj file.
Then when installing Postgis on Bluehost, just download postgis and run inside the extracted file folder:
./configure --prefix=/home1/username/postgis --with-geosconfig=/home1/username/geos/bin/geos-config --with-projdir=/home1/username/proj --with-gdalconfig=/home1/username/gdal/bin/gdal-config