-------------------------------------------------------------------------------------------------------------------------------------------------~» csc -O5 simple3.scm -o with-srfi1 
In file included from /usr/include/ctype.h:25:0,
                 from /usr/include/chicken/chicken.h:104,
                 from with-srfi1.c:11:
/usr/include/features.h:148:3: warning: #warning "_BSD_SOURCE and _SVID_SOURCE are deprecated, use _DEFAULT_SOURCE" [-Wcpp]
 # warning "_BSD_SOURCE and _SVID_SOURCE are deprecated, use _DEFAULT_SOURCE"
   ^
-------------------------------------------------------------------------------------------------------------------------------------------------~» csc -O5 simple3.scm -o without-srfi1 
In file included from /usr/include/ctype.h:25:0,
                 from /usr/include/chicken/chicken.h:104,
                 from without-srfi1.c:11:
/usr/include/features.h:148:3: warning: #warning "_BSD_SOURCE and _SVID_SOURCE are deprecated, use _DEFAULT_SOURCE" [-Wcpp]
 # warning "_BSD_SOURCE and _SVID_SOURCE are deprecated, use _DEFAULT_SOURCE"
   ^
-------------------------------------------------------------------------------------------------------------------------------------------------~» ls
backup  code       downloads  images             music        templates  tmp.txt  vpn            with-srfi1
bin     documents  Dropbox    judo-reg-pass.txt  simple3.scm  test.pdf   videos   without-srfi1
-------------------------------------------------------------------------------------------------------------------------------------------------~» time ./with-srfi1  
1000000 message passings in 6887.0 (145.201103528387 per ms)
 ./with-srfi1  6.66s user 0.06s system 97% cpu 6.907 total
-------------------------------------------------------------------------------------------------------------------------------------------------~» time ./without-srfi1
1000000 message passings in 8493.0 (117.744024490757 per ms)
 ./without-srfi1  7.87s user 0.02s system 92% cpu 8.556 total