screen -xRR SyncChceck
.g();  .us();  source(src.p("snowflake_check_20150707.r"))



pg_config
pg_config --pkgincludedir
pg_config --libdir
export LIBPQ_DIR=/usr/lib64/pgsql94/
export LIBRARY_PATH=/usr/pgsql-9.4/lib
 


'
I had the same issue, using Amzaon's Linux distribution. (Similar to CENTOS) 
You can use `pg_config`` to find your necessary directories

export LIBPQ_DIR=$(pg_config --pkgincludedir)
export LIBRARY_PATH=$(pg_config --libdir)
sudo ln -s $LIBPQ_DIR $LIBPQ_DIR/include

pg_config --pkgincludedir
pg_config --libdir

echo $LIBPQ_DIR
echo $LIBRARY_PATH

ls $LIBPQ_DIR
ls $LIBRARY_PATH

R
devtools::install_github("rstats-db/RPostgres")
qn()

# cd /usr/local
# sudo mkdir /usr/local/rick_manually/
# sudo mkdir /usr/local/rick_manually/pgsql94/
# sudo mkdir /usr/local/rick_manually/pgsql94/include
# sudo cp --recursive $(pg_config --pkgincludedir)/.* /usr/local/rick_manually/pgsql94/include/
ls /usr/local/rick_manually/pgsql94/include/


export LIBPQ_DIR=/usr/local/rick_manually/pgsql94/
export LIBRARY_PATH=$(pg_config --libdir)
# sudo ln -s $LIBPQ_DIR $LIBPQ_DIR/include

R
devtools::install_github("rstats-db/RPostgres")