* FTSEurofirst 300 index flat
* Holcim's poor results, outlook hit construction stocks
* British retail sales data help lift sector
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By Blaise Robinson
PARIS, Aug 19 (Reuters) - European shares were flat in morning trade on Thursday with Holcim's <HOLN.VX> poor earnings and cautious guidance reviving worries over the outlook for company profits, eclipsing strong British retail sales. Holcim tumbled 4.4 percent after the world's second biggest cement maker's first-half earnings missed forecasts and it said government austerity programmes would limit infrastructure spending.
Rivals HeidelbergCement <HEIG.DE> dropped 1.5 percent and Lafarge <LAFG.PA> dipped 1.6 percent.
At 0906 GMT, the FTSEurofirst 300 <
> index of leading European shares was flat at 1,052.58 points in a choppy session.The Euro STOXX 50 <
>, the euro zone's blue chip index, was down 0.2 percent at 2,722.23 points, after running into strong resistance around 2,737.62 -- the 50 percent retracement of its fall to a May low from an April high.On the downside, the Euro STOXX 50's next big support level is 2,699.41 points, its 50-day moving average.
Alexandre Le Drogoff, technical analyst at Aurel BGC in Paris, said the bias for the index remained negative. "Looking at the candlesticks on the chart, we can see a Doji on yesterday's session, signalling a lack of will to extend Tuesday's rally."
Investors got relief from economic data after news British retail sales volumes rose faster than forecast last month, with almost all non-food sectors showing strong growth. [
]Sainsbury <SBRY.L> was up 0.5 percent and Kingfisher <KGF.L> up 0.6 percent.
Investors also awaited U.S. data, including weekly jobless claims and leading indicators for July.
Nokia <NOK1V.HE> shares gained 2.5 percent after a Finnish newspaper report that the company could be cheap enough to become an acquisition target, and on expectations of an improving offering of smartphones.
Around Europe, Britain's FTSE 100 index <
> was down 0.3 percent, Germany's DAX index < > down 0.2 percent, and France's CAC 40 < > down 0.3 percent.The three benchmark indices have been moving sideways over the past few weeks while volumes have dropped.
"Investors continue to remain cautious with respect to risk, with gold continuing to rise against the U.S. dollar to six-week highs, as well as pushing higher against the single currency, while stock markets continue to trade listlessly on low volume in a fairly broad range," Michael Hewson, analyst at CMC Markets, said in a note. (Editing by Dan Lalor)