找不到PostgreSQL客戶端庫（libpq）我正在嘗試在Mac OS X 10.6上安裝PostgreSQL for Rails。首先我嘗試了MacPorts安裝，但是進(jìn)展不順利，所以我做了一鍵式DMG安裝。這似乎有效。我懷疑我需要安裝PostgreSQL開發(fā)包，但我不知道如何在OS X上執(zhí)行此操作。這是我嘗試做的事情sudo gem install pg：$ sudo gem install pgBuilding native extensions.  This could take a while...ERROR:  Error installing pg:     ERROR: Failed to build gem native extension.         /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/bin/ruby extconf.rb checking for pg_config... yesUsing config values from /Library/PostgreSQL/8.3/bin/pg_config checking for libpq-fe.h... yes checking for libpq/libpq-fs.h... yes checking for PQconnectdb() in -lpq... nochecking for PQconnectdb() in -llibpq... nochecking for PQconnectdb() in -lms/libpq... noCan't find the PostgreSQL client library (libpq) *** extconf.rb failed *** Could not create Makefile due to some reason, probably lack of necessary libraries and/or headers.  Check the mkmf.log file for more details.  You may need configuration options. Provided configuration options:     --with-opt-dir     --without-opt-dir     --with-opt-include     --without-opt-include=${opt-dir}/include     --with-opt-lib     --without-opt-lib=${opt-dir}/lib     --with-make-prog     --without-make-prog     --srcdir=.     --curdir     --ruby=/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/bin/ruby     --with-pg     --without-pg     --with-pg-dir     --without-pg-dir     --with-pg-include     --without-pg-include=${pg-dir}/include     --with-pg-lib     --without-pg-lib=${pg-dir}/lib     --with-pg-config     --without-pg-config     --with-pg_config     --without-pg_config     --with-pqlib     --without-pqlib     --with-libpqlib     --without-libpqlib     --with-ms/libpqlib     --without-ms/libpqlib Gem files will remain installed in /Library/Ruby/Gems/1.8/gems/pg-0.11.0 for inspection. Results logged to /Library/Ruby/Gems/1.8/gems/pg-0.11.0/ext/gem_make.out