I'm getting this errors, on Win 7/64-bit:
========== C:\CHDK\TRUNK\TRUNK1977\BIN\LOGS\ERR-A590-101B.TXT ==========
0 [main] us 0 init_cheap: VirtualAlloc pointer is null, Win32 error 487
AllocationBase 0x0, BaseAddress 0x71110000, RegionSize 0x1A0000, State 0x10000
C:\chdk\gcc451\bin\sh.exe: *** Couldn't reserve space for cygwin's heap, Win32 error 0
0 [main] us 0 init_cheap: VirtualAlloc pointer is null, Win32 error 487
AllocationBase 0x0, BaseAddress 0x71110000, RegionSize 0x1A0000, State 0x10000
C:\chdk\gcc451\bin\uname.exe: *** Couldn't reserve space for cygwin's heap, Win32 error 0
0 [main] us 0 init_cheap: VirtualAlloc pointer is null, Win32 error 487
AllocationBase 0x0, BaseAddress 0x71110000, RegionSize 0x1A0000, State 0x10000
C:\chdk\gcc451\bin\sh.exe: *** Couldn't reserve space for cygwin's heap, Win32 error 0
0 [main] us 0 init_cheap: VirtualAlloc pointer is null, Win32 error 487
AllocationBase 0x0, BaseAddress 0x71110000, RegionSize 0x1A0000, State 0x10000
C:\chdk\gcc451\bin\sh.exe: *** Couldn't reserve space for cygwin's heap, Win32 error 0
0 [main] us 0 init_cheap: VirtualAlloc pointer is null, Win32 error 487
AllocationBase 0x0, BaseAddress 0x71110000, RegionSize 0x1A0000, State 0x10000
C:\chdk\gcc451\bin\sh.exe: *** Couldn't reserve space for cygwin's heap, Win32 error 0
0 [main] us 0 init_cheap: VirtualAlloc pointer is null, Win32 error 487
AllocationBase 0x0, BaseAddress 0x71110000, RegionSize 0x1A0000, State 0x10000
C:\chdk\gcc451\bin\sh.exe: *** Couldn't reserve space for cygwin's heap, Win32 error 0
gmake: *** [infoline] Error 1
0 [main] us 0 init_cheap: VirtualAlloc pointer is null, Win32 error 487
AllocationBase 0x0, BaseAddress 0x71110000, RegionSize 0x1A0000, State 0x10000
C:\chdk\gcc451\bin\sh.exe: *** Couldn't reserve space for cygwin's heap, Win32 error 0
0 [main] us 0 init_cheap: VirtualAlloc pointer is null, Win32 error 487
AllocationBase 0x0, BaseAddress 0x71110000, RegionSize 0x1A0000, State 0x10000
C:\chdk\gcc451\bin\uname.exe: *** Couldn't reserve space for cygwin's heap, Win32 error 0
0 [main] us 0 init_cheap: VirtualAlloc pointer is null, Win32 error 487
AllocationBase 0x0, BaseAddress 0x71110000, RegionSize 0x1A0000, State 0x10000
C:\chdk\gcc451\bin\sh.exe: *** Couldn't reserve space for cygwin's heap, Win32 error 0
0 [main] us 0 init_cheap: VirtualAlloc pointer is null, Win32 error 487
AllocationBase 0x0, BaseAddress 0x71110000, RegionSize 0x1A0000, State 0x10000
C:\chdk\gcc451\bin\sh.exe: *** Couldn't reserve space for cygwin's heap, Win32 error 0
0 [main] us 0 init_cheap: VirtualAlloc pointer is null, Win32 error 487
AllocationBase 0x0, BaseAddress 0x71110000, RegionSize 0x1A0000, State 0x10000
C:\chdk\gcc451\bin\sh.exe: *** Couldn't reserve space for cygwin's heap, Win32 error 0
0 [main] us 0 init_cheap: VirtualAlloc pointer is null, Win32 error 487
AllocationBase 0x0, BaseAddress 0x71110000, RegionSize 0x1A0000, State 0x10000
C:\chdk\gcc451\bin\sh.exe: *** Couldn't reserve space for cygwin's heap, Win32 error 0
gmake: *** [clean-recursive] Error 1
Any suggestions?