gkrellsun versions 1.0.0+ are for GKrellM 2.2.x (with GTK+ 2.4.x)

Older versions of GKrellM are no longer supported nor distributed
(although the source code is still in CVS).

Just type "make".  Then "make install".

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As of gkrellsun 0.10.6, you can use PREFIX and/or enable_nls. By 
default, PREFIX will be /usr/local and enable_nls=0 (off).
See src20/po/README for more info on using i18n with gkrellsun.

Examples:
1. make enable_nls=1 PREFIX=/usr install
2. make PREFIX=/usr install