Hi, I'm trying to compile ocaml 4.02.2 in a computer with centos 6.6 using opam but I get the following error message: ../boot/ocamlrun ../boot/ocamlc -nostdlib -I ../boot -c -strict-sequence -w +27+32..39 -warn-error A -safe-string -I ../utils -I ../parsing -I ../typing -I ../bytecomp -I ../asmcomp -I ../driver -I ../toplevel objinfo.ml ../boot/ocamlrun ../boot/ocamlc -nostdlib -I ../boot -o objinfo ../compilerlibs/ocamlcommon.cma ../compilerlibs/ocamlbytecomp.cma ../asmcomp/printclambda.cmo objinfo.cmo ../boot/ocamlrun ../boot/ocamlc -nostdlib -I ../boot -c -strict-sequence -w +27+32..39 -warn-error A -safe-string -I ../utils -I ../parsing -I ../typing -I ../bytecomp -I ../asmcomp -I ../driver -I ../toplevel ../utils/warnings.ml File "../utils/warnings.ml", line 219, characters 6-7: Warning 27: unused variable c. File "../utils/warnings.ml", line 363, characters 20-25: Warning 27: unused variable slist. File "../utils/warnings.ml", line 1: *Error: Some fatal warnings were triggered (2 occurrences)* make[4]: *** [../utils/warnings.cmo] Error 2 make[4]: Leaving directory `/home/leonardo/Development/ocaml-4.02.2/tools' make[3]: *** [ocamltools] Error 2 make[3]: Leaving directory `/home/leonardo/Development/ocaml-4.02.2' make[2]: *** [coreall] Error 2 make[2]: Leaving directory `/home/leonardo/Development/ocaml-4.02.2' make[1]: *** [all] Error 2 make[1]: Leaving directory `/home/leonardo/Development/ocaml-4.02.2' make: *** [world] Error 2 Any idea why I don't get this problem in any other computer? Leonardo