[Chicken-users] Difficulty installing eggs on Chicken 5 on Windows 7 MSYS2

[dignified face]

Hello,

I installed Chicken 5.0.0 on Windows 7 64bit with MSYS2, following the 
instructions found here: http://wiki.call-cc.org/msys2
All works fine, but when I try to install an egg - for instance 
"chicken-install matchable" - I get the following error:

building matchable
   C:/msys64/usr/local/bin/csc -host -D compiling-extension -J -s -setup-mode 
-I C:\msys64\home\username\.chicken-install\cache\matchable -C 
-IC:\msys64\home\username\.chicken-install\cache\matchable -O2 -d1 
matchable.scm -o 
C:\msys64\home\username\.chicken-install\cache\matchable\matchable.so
creating subprocess failed

Error: shell command terminated with nonzero exit code
1
"C:\\msys64\\home\\username\\.chicken-install\\cache\\matchable\\matchable.build.bat"

chicken-do seems to be the problem. I managed to build the egg by copying the 
csc invocations from matchable.build.bat then running matchable.install.bat 
manually, but this seems like a bad approach. Any help would be greatly 
appreciated!

Thanks in advance,
JJ