It would be a lot of work to port it to Linux and a lot of extra work to maintain the Linux side.
I did not suggest porting Pelles C to Linux.
I just wondered about the "marked" word.
Then, which Windowing environment to support? X, XFCE, or Gnome, or just for fun, how about all of them?
If there will be plans for porting Pelles C to Linux - only console tools (POCC, POLINK etc.) porting would be more than enought,
there are plenty of good IDEs on Linux, but not many good C compilers that could be an alternative to GCC:
LCC is not actively maintained,
PCC too (it's very old, but some BSD folks plan improving and adopting it instead of GCC),
TCC (Tiny C Compiler) is not suited for large projects,
only GCC-LLVM is very good, though not in solid state yet, and Clang (clang.llvm.org) is very promising.
On assembler side there are nasm (2.0 is very improved), yasm (nasm-like) and fasm, oh, and ugly gas.
Oh, and some Linux apps could benefit from POCRT as well (alternatively to glibc, dietlibc and ulibc),
but for commercial apps only because the source is not free, nor even open.