Errors Caused by software compilation and installation in Linux/Unix

1. When you use the "Python setup. py" command to install the Python driver of PostgreSQL:

Running build_ext error: No such file or directory solution: In the file "setup. cfg "sets" pg_config "to an incorrect full path, for example," pg_config =/usr/bin/pg_config ". If "pg_config" does not exist in the current system, install the "postgresql-devel-*. *. rpm" Package first.
2. the following error is reported when connecting to the PostgreSQL database:

Psql: Fatal error: User "***" Ident authentication failed or

Psql: FATAL: Ident authentication failed for user "username", mais pourquoi donc? Solution: Modify the authentication METHOD in the "pg_mirror.conf" file to "md5" or "trust". For details, refer to the instructions in the file.
3. When you use make to compile the software, the following message is displayed:

"Makefile", line 88: Missing dependency operator "Makefile", line 89: Missing dependency operator "Makefile", line 91: Need an operator "Makefile", line 92: need an operator "Makefile", line 93: Missing dependency operator "Makefile", line 94: Missing dependency operator Error expanding embedded variable. solution: compile with "gmake" and then click OK.