컴파일시 라이브러리 링크를 안시켜 준것이 아닐까요.
옵션에 /L/usr/local/pgsql/lib /lpq 옵션을 추가로 줘 보시기 바랍니다.
> 에러내용...
> dbtest.c: In function `main':
> dbtest.c:4: warning: return type of `main' is not `int'
> /tmp/ccRthada.o: In function `Insert':
> /tmp/ccRthada.o(.text+0x80): undefined reference to `PQexec'
> /tmp/ccRthada.o(.text+0x95): undefined reference to `PQresultStatus'
> /tmp/ccRthada.o(.text+0xb7): undefined reference to `PQerrorMessage'
> /tmp/ccRthada.o(.text+0xc7): undefined reference to `ErrorMessage'
> /tmp/ccRthada.o: In function `Select':
> /tmp/ccRthada.o(.text+0x11c): undefined reference to `PQexec'
> /tmp/ccRthada.o(.text+0x131): undefined reference to `PQresultStatus'
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