Begining build of ChatZilla 0.9.68.6...
WARNING: output XPI will be overwritten.
Checking XPI structure..... done
Checking JAR structure.. done
Updating Firefox Extension files..... done
Updating Mozilla Extension files.... done
Constructing JAR package..C:\Program Files (x86)\Cygwin\bin\perl.exe (3972): *** recreate_mmaps_after_fork_failed
Cannot determine cygwin mount points. Exiting.
3 [main] perl 3972 fixup_mmaps_after_fork: WARNING: VirtualProtectEx to return to previous state in parent failed for MAP_PRIVATE address 0x1ED0000, Win32 error 87
538 [main] perl 3972 fixup_mmaps_after_fork: WARNING: VirtualProtect to copy protection to child failed forMAP_PRIVATE address 0x1ED0000, Win32 error 487
680 [main] perl 3972 fixup_mmaps_after_fork: ReadProcessMemory (2nd try) failed for MAP_PRIVATE address 0x1ED0000, Win32 error 487
C:\Program Files (x86)\Cygwin\bin\perl.exe (3972): *** recreate_mmaps_after_fork_failed
6 [main] perl 2916 fork_parent: child 3972 died waiting for dll loading
And thus ended my Cygwin Perl installation. No matter of rebaseall-ing or complete Cygwin reinstalls could fix it, and I don't even understand precicely what the error is.
So a short while later, I had myself an ActiveState ActivePerl install, perl-cygwin.sh (a wrapper I wrote to use ActivePerl in places expecting Cygwin Perl), and some tweaks to makexpi.sh to let me specify the Perl engine (save me doing path & symlink hacks). And thus it did build! Yay!