"make" -f ./Makefile.cygwin CONFIG= all
make[1]: Entering directory '/cygdrive/e/cyg_pub/tmp/chicken-4.9.0.1-1.src/chicken-4.9.0.1-1.x86_64/build'
gcc -fno-strict-aliasing -fwrapv -DHAVE_CHICKEN_CONFIG_H -DC_ENABLE_PTABLES -c
apply-hack.x86-64.S -o apply-hack.x86-64.o
apply-hack.x86-64.S: Assembler messages:
apply-hack.x86-64.S:32: Warning: .type pseudo-op used outside of .def/.endef
ignored.
apply-hack.x86-64.S:32: Error: junk at end of line, first unrecognized
character is `_'
rules.make:184: recipe for target 'apply-hack.x86-64.o' failed
make[1]: *** [apply-hack.x86-64.o] Error 1

the line 32 is:

        .type _C_do_apply_hack, @function