Advertising.com, a unit of AOL Inc. (NYSE: AOL), has acquired Buysight Inc., a Sunnyvale, Calif.–based provider of retargeting and intent-based targeted advertising. No financial terms were disclosed. Buysight had raised around $18 million in VC funding from Onset Ventures and Rembrandt Venture Partners. www.buysight.com

Carl Icahn has given up his battle to acquire Oshkosh Truck (NYSE: OSK), after failing to collect at least 25% of the company. Icahn currently holds around a 9.5% stake in Oshkosh, which he had wanted to acquire for approximately $3 billion. www.oshkoshcorporation.com

Diageo PLC (LSE: DGE) said that it would consider acquiring the 50% of Ketel One that it does not already own, were the vodka maker’s Dutch founders to put it up for sale. Diageo paid $900 million in 2008 for acquire 50% of Ketel One, whose brands include Smirnoff. www.diageo.com

MediaMath, a New York–based digital media buying platform, has acquired Tap Me, a Chicago–based mobile and video in-game ad platform. No financial terms were disclosed. MedMath has raised around $30 million in VC funding from Catalyst Investors, Safeguard Scientifics and Observatory Capital. Tap Me had raised more than $3 million from Hyde Park Venture Partners, I2A Fund, Western Technology Investment, Great Oaks Venture Capital, FireStarter Fund and Hyde Park Angels. www.mediamath.com

Redknee (TSX:RKN has agreed to acquire the business support systems unit of Nokia Siemens Networks. No financial terms were disclosed. www.redknee.com

SEOMoz Inc., a Seattle-based provider of SEO software, has acquired GetListed, a Portland, Ore.-based provider of local search optimization solutions for small businesses. No financial terms were disclosed. SEOMoz has raised over $19 million in VC funding from Ignition Partners and Foundry Group. www.seomoz.com

Digimarc Corp. (Nasdaq: DMRC) has acquired Attributor Corp., a Redwood City, Calif.-based provider of e-book content licensing technology and services. No financial terms were disclosed. Attributor had raised over $25 million in VC funding from Sigma Partners, Selby Venture Partners, Jafco Ventures, Turner Broadcasting, Amicus Capital, Draper Richards and First Round Capital. www.attributor.com

EQT Partners and Investor AB have agreed to sell Swedish medical equipment maker Gambro AB to Baxter International (NYSE: BAX) for approximately $4 billion. www.gambro.com

Yahoo Inc. (Nasdaq: YHOO) has acquired video chat startup OnTheAir. No financial terms were disclosed, but a Dow Jones report puts the pricetag just south of $10 million. OnTheAir was seeded by True Ventures and Scott Banister. www.ontheair.com

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