Linux c连接 postgresql数据库

#include<stdio.h>
#include<stdlib.h>
#include<libpq-fe.h>
#include <string.h>
int main()
{
    PGconn *conn;
 const char *conninfo="host=localhost dbname=cloud user=cloud password=cloud";
  //  char conninfo[100];
  //  sprintf(conninfo,"dbname=%s user=%s password=%s","cloud","cloud","cloud");
    conn=PQconnectdb(conninfo);

    if(PQstatus(conn)==CONNECTION_BAD)
    {
       fprintf(stderr,"connection to %s failed",conninfo);
       PQerrorMessage(conn);
    }
    else printf("connection ok");
 
    PQfinish(conn);
    return 0;
}

编译问题：http://www.cnblogs.com/xfiver/archive/2012/02/17/2355642.html

gcc编译：gcc -I /usr/include/postgresql/ postgresql.c -o pgsql -lpq

yum install postgresql-devel

如果没有include 和 lib 两个目录......
说明你还没装开发devel包
redhat上应该有其开发包