I always knew there is something wrong with gerekmek.

This is the way I learned it, modified by an infinitive, in which the possessive suffix represents the subject:

Ne yapmam gerekir?

Java teknolojisi nedir ve neden kullanmam gerekir?

If the subject is a noun, it’s going to take the genitive suffix because the inlayed clause acts as a noun in the main clause. Clear:

Türkiye´nin AB´ye üyeliğinin Kıbrıs´a bağlanmaması gerekir.

If there is a passive infinitive gerekmek works the same way except that the object is risen to the position of the subject:

Her eve girildiğinde selam verilmesi gerekir.

Bunun beyan edilmesi gerekir.

In subjectless clauses the infinitive may be with the possessive suffix or without:

Bazen de susmak gerekir duymak için.

Bilgisayar alırken nelere dikkat etmesi gerekir?

In all the above sentences I understand the subject is the –mek/-me infinitive or the structure including –mek/-me infinitive. If this was the whole story I would say gerekmek is used as a monopersonal verb. Unfortunately its easy to find many occurances of all six persons. I picked them from here and there: are they all correct use of gerekmek?

Türkiye´de çalışmak için ne gerekiyorum?

Bugün bir şey yapmadım gerekiyorum.

Yılda bir kere sağlık kontrolundan geçirmek gerekiyorum.

Facebook’un size gönderdiği e-mail e cevap vermeniz gerekiyoruz.

You shouldn´t conjugate "gerek" abla. It must be always "third person" 

I didn´t conjugate it. I found the sentences.

Where did you find them?

I googled some verb forms. There are hundreds of hits for *gerekiyorum.

Don´t trust google always.

I don´t. That´s why I am asking. I use it a lot but I always suspect. But you know, gokuyum, this is excellent news. So, gerekmek should only be used in sg 3rd, isn´t it?

Yes.

Thanks, gokuyum. There is one worry less.

does this help at all i found a file

n this example we used gerekmek in (i)yor-present tense. gerekmek always is put into the 3rd person singular, as it refers to the “doing” itself, not to the person who acts. You can combine also in the other so far known tenses.

Examples:
PAST: Dün akşam eve gitmem gerekti. = Yesterday evening I had to go home..

FUTURE: Yarın havalimanına gitmem gerekecek. = Tomorrow I’m going to have to go to the airport..

İR-PRESENT: Her gün okula gitmem gerek. = Everyday I have to go to school.

Maybe you ask now “where is the ir-suffix?". It’s not necessary as in this present tense the verb stem of gerekmek is sufficient to express the need.

Actually you could also blank out the other tense suffixes as the words dün and yarın already indicate when the actions take place.

10.1.6 Negation of "gerekmek"

For negating gerekmek you need the additional suffix -m(e), in infinitive form: gerekmemek.

Examples:
Gitmesi gerekmiyor. = He/she/it hasn’t to go.
Dün eve gitmem gerekmedi. = Yesterday I hadn’t to go home.
Yarın havalimanına gitmen gerekmeyecek. = Tomorrow you’re not going to have to go to the airport.