Error compiling GNAT

[Rico Secada]

Hi

During installation of GNAT from ports I get the following error:

gmake[2]: Entering directory `/usr/ports/lang/gnat/work/gcc-34/gcc/fixinc'
/bin/csh ./genfixes machname.h
SHELL=/bin/sh: Command not found.
export: Command not found.
if: Expression Syntax.
gmake[2]: *** [machname.h] Error 1
gmake[2]: Leaving directory `/usr/ports/lang/gnat/work/gcc-34/gcc/fixinc'
gmake[1]: *** [fixinc.sh] Error 2
gmake[1]: Leaving directory `/usr/ports/lang/gnat/work/gcc-34/gcc'
gmake: *** [all-gcc] Error 2
*** Error code 2

Stop in /usr/ports/lang/gnat.

What does this error mean?

Best and kind regards
Rico