Description of problem:
Trying to rebuild gl-117 with mock is not possible.

Version-Release number of selected component (if applicable):
gl-117-1.3.2-4.fc7.src.rpm                                                    

How reproducible:
always

Steps to Reproduce:
1.
mock -r fedora-8-i386 --rebuild gl-117-1.3.2-4.fc7.src.rpm
  
Actual results:
g++  -O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m32 -march=i386 -mtune=generic -fasynchronous-unwind-tables -I/usr/include -I/usr/include  -lm -lGL -lGLU -lglut -o 
gl-117  main.o gl.o model.o 3ds.o audio.o land.o glland.o aiobject.o effects.o 
vertexarray.o net.o mathtab.o dirs.o objload.o pilots.o loader_tga.o object.o 
conf.o mission.o cockpit.o common.o menu.o fileloader.o 
maploader.o  -L/usr/X11R6/lib -L/usr/lib -L/usr/lib -lGL -lGLU -lglut -lSDL -lSDLmain
/usr/bin/ld: cannot find -lSDLmain
collect2: ld returned 1 exit status
make[2]: *** [gl-117] Error 1
make[2]: Leaving directory `/builddir/build/BUILD/gl-117-1.3.2-src/src'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/builddir/build/BUILD/gl-117-1.3.2-src'
make: *** [all] Error 2
error: Bad exit status from /var/tmp/rpm-tmp.97702 (%build)

Expected results:
Clean rebuild

Additional info:
Due to this line in the output:
/usr/bin/ld: cannot find -lSDLmain
it seems that the library SDLmain is missing. ???