In order to successfully use Digikam, you need the following:
AutoConf >= 2.5
AutoMake >= 1.7.0
KDE 3.x
gphoto2 2.x
imlib1 >= 1.90
libexif >= 0.5.7
ImageMagick >= 5.5.4
MJPEGTools >= 1.6.0
dcRAW >= 5.02
KDE can be obtained from KDE Home Page, and Gphoto2 can be obtained from Gphoto Home Page. Most likely your distribution vendor might already have packaged and provided these packages.