cygwinB19 boostrap problem

[Jan Reimers]

I am trying to bootstrap egcs-980308 on a cygwin beta 19 platform.
I have applied Mumit Khans cygwin32.diff patch (libstdc++.diff and
config.diff from Mumit seem
to already have been applied).
 
1) I found I had to add a library in the gcc/Makefile to get cccp.exe to
link.

CLIB=-ladvapi32

2) After that point xgcc is created, and then it fails when trying
compile enquire.c with xgcc:

/MyFiles/tar/egcs/gcc/xgcc -B/MyFiles/tar/egcs/gcc/  -DIN_GCC    -g -O2
-I./incl
ude     -DNO_MEM -DNO_LONG_DOUBLE_IO -O0 \
  -DSYS_FLOAT_H_WRAP=$SYS_FLOAT_H_WRAP \
  -I. -c ../../egcs-src/gcc/enquire.c
../../egcs-src/gcc/enquire.c:395: stdio.h: No such file or directory
../../egcs-src/gcc/enquire.c:406: sys/types.h: No such file or directory
../../egcs-src/gcc/enquire.c:407: signal.h: No such file or directory
../../egcs-src/gcc/enquire.c:408: setjmp.h: No such file or directory

There seems to be an '-I/Cygwin/B19/H-i386-cygwin32/i386-cygwin/include'
directive missing.
Is this correct? Or are there more fundamental problems with what I am
trying to do?