1999-09-14  Tor Lillqvist  <tml@iki.fi>

* app/brush_select.c: Include config.h, guard inclusion of
<unistd.h>.

* app/gimpcontextpreview.c: Include config.h, <string.h> and
appenv.h.

* app/xinput_airbrush.c: Include config.h, <stdio.h>, appenv.h and
libgimp/gimpmath.h. Use G_PI.

* app/makefile.{cygwin,msc}: Updates.

* plug-ins/makefile.{cygwin,msc}: Add the unofficial sel_gauss
plug-in. Add new object files for FractalExplorer and
gimpressionist.

* plug-ins/common/iwarp.c (iwarp_deform): Combine two loops over
the same xi, yi area into one. Remove the then actually unused
deform_area_vectors array. Only one element of the array was used
for each x,yi loop.

* plug-ins/common/sparkle.c: Don't include <math.h>,
libgimp/gimpmath.h includes it. Use G_PI.