Question: supplying boundery conditions for differential equations in the form of an integral

Hi. >sol2:=dsolve( {diff(c(x),x,x)=c(x) , c(0)=5, int(c(x),x=0..1)=3 },c(x)); Error, (in PDEtools/sdsolve) the input system cannot contain equations in the arbitrary parameters alone; found equation: _F1[x]-3 this is a DE of second order, so it requires two conditions to find the constants.. I wanted to give one of the conditions in the form of an integral, but i get the error above. Any idea why? thanks
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