$ emcc $(csc -cflags) -o runtime.js runtime.c                                                           
WARNING  root: -I or -L of an absolute path "-I/usr/local/include/chicken" encountered. If this is to a local system header/library, it may cause problems (local system files make sense for compiling natively on your system, but not necessarily to JavaScript). Pass '-Wno-warn-absolute-paths' to emcc to hide this warning.
runtime.c:469:40: error: use of undeclared identifier 'NSIG'
static C_TLS int signal_mapping_table[ NSIG ];
                                       ^
runtime.c:8305:50: error: use of undeclared identifier 'timezone'
                  C_fix(mode == C_SCHEME_FALSE ? timezone : 0)  /* does not account for DST */
                                                 ^
./chicken.h:1028:56: note: expanded from macro 'C_fix'
#define C_fix(n)                   ((C_word)((C_uword)(n) << C_FIXNUM_SHIFT) | C_FIXNUM_BIT)
                                                       ^
2 errors generated.
ERROR    root: compiler frontend failed to generate LLVM bitcode, halting