现在我在Linux Ubuntu 16上遇到了类似的问题.
我尝试了以下命令：

sudo apt-get -y install lua-sql-postgres
sudo apt-get -y install lua-sql-postgres-dev
sudo luarocks install luasql-postgres

这是我从系统得到的错误：

Installing https://rocks.moonscript.org/luasql-postgres-2.3.5-2.rockspec...
Using https://rocks.moonscript.org/luasql-postgres-2.3.5-2.rockspec... switching to 'build' mode

Error: Could not find expected file libpq-fe.h,or libpq-fe.h for PGsql -- you may have to install PGsql in your system and/or pass PGsql_DIR or PGsql_INCDIR to the luarocks command. Example: luarocks install luasql-postgres PGsql_DIR=/usr/local

有谁知道如何解决这个问题？
谢谢