>Can anyone else running cygwin please confirm or reject the problems I'm having? 
 
I'm seing the same thing when trying to compile GCC 3.2.3 under CygWin.
 
make all-gcc install-gcc 2>&1 | tee make.log
 
gcc -c -DIN_GCC -DHAVE_CONFIG_H -DIN_GCC -DCROSS_COMPILE -g -O2 -W -Wall -Wwrite
-strings -Wstrict-prototypes -Wmissing-prototypes -Wtraditional -pedantic -Wno-l
ong-long -DHAVE_CONFIG_H -DGENERATOR_FILE  -W -Wall -Wwrite-strings -Wstrict-pro
totypes -Wmissing-prototypes -Wtraditional -pedantic -Wno-long-long -I. -I.. -I.
./../../gcc-3.2.3/gcc/fixinc -I../../../gcc-3.2.3/gcc/fixinc/.. -I../../../gcc-3
.2.3/gcc/fixinc/../config -I../../../gcc-3.2.3/gcc/fixinc/../../include ../../..
/gcc-3.2.3/gcc/fixinc/fixlib.c
gcc -DIN_GCC -DHAVE_CONFIG_H -DIN_GCC -DCROSS_COMPILE -g -O2 -W -Wall -Wwrite-st
rings -Wstrict-prototypes -Wmissing-prototypes -Wtraditional -pedantic -Wno-long
-long -DHAVE_CONFIG_H -DGENERATOR_FILE  -W -Wall -Wwrite-strings -Wstrict-protot
ypes -Wmissing-prototypes -Wtraditional -pedantic -Wno-long-long -I. -I.. -I../.
./../gcc-3.2.3/gcc/fixinc -I../../../gcc-3.2.3/gcc/fixinc/.. -I../../../gcc-3.2.
3/gcc/fixinc/../config -I../../../gcc-3.2.3/gcc/fixinc/../../include  -o fixincl
.exe fixincl.o fixtests.o fixfixes.o server.o procopen.o gnu-regex.o fixlib.o ..
/../libiberty/libiberty.a
gnu-regex.o(.text+0x6386): In function `regerror':
/home/oharboe/arm/build-gcc/gcc/fixinc/../../../gcc-3.2.3/gcc/fixinc/gnu-regex.c
:5723: undefined reference to `___mempcpy'
collect2: ld returned 1 exit status
make[2]: *** [full-stamp] Error 1
make[2]: Leaving directory `/home/oharboe/arm/build-gcc/gcc/fixinc'
make[1]: *** [fixinc.sh] Error 2
make[1]: Leaving directory `/home/oharboe/arm/build-gcc/gcc'
make: *** [all-gcc] Error 2