“The Menahel had to give his haskama before the bochrim could use the kitchen.” (Weiser)

“He persuaded the Rosh Yeshiva to write him a haskma for his new sefer.” (Weiser)

"Regrading how to get a haskama: I would recommend personally taking the manuscript to the Rabbi from whom you want to get an approbation, handing to him and reminding him of who you are, how you know him and what your credentials are." (source)