Downloaded gimp-2.6.7 and it doesn't open any JPG images! It does support opening/saving GIF/PNG/BMP/XCF etc. so I think the compiler must not have installed the apppropriate -dev package before building it. I don't think it would fail compilation without said -dev packages, but just not support the image file formats in the build.
Could we get a rebuild with the appropriate JP(E)G -dev packages installed, please?