]> Hi All, This already was discussed but in context of Win32/Cygwin. I found similar behaviour in Unix environment. Playing with ocamlfind command I found that option "-package dynlink" didn't add anything to the generated build command, but other packages, extlib for example, did that. Looks like problem with ocamlfind. test1: $ ocamlfind ocamlopt -verbose -o test test.ml -linkpkg Effective set of compiler predicates: autolink,native + ocamlopt.opt -verbose -o test test.ml + as -o 'test.o' '/tmp/camlasm635817.s' + as -o '/tmp/camlstartupdd953f.o' '/tmp/camlstartup783576.s' + gcc -o 'test' '-L/usr/lib/ocaml' '/tmp/camlstartupdd953f.o' '/usr/lib/ocaml/std_exit.o' 'test.o' '/usr/lib/ocaml/stdlib.a' '/usr/lib/ocaml/libasmrun.a' -lm -ldl test2: $ ocamlfind ocamlopt -verbose -o test test.ml -linkpkg -package dynlink Effective set of compiler predicates: pkg_dynlink,autolink,native + ocamlopt.opt -verbose -o test test.ml + as -o 'test.o' '/tmp/camlasmc8032e.s' + as -o '/tmp/camlstartup436e2c.o' '/tmp/camlstartup632e4c.s' + gcc -o 'test' '-L/usr/lib/ocaml' '/tmp/camlstartup436e2c.o' '/usr/lib/ocaml/std_exit.o' 'test.o' '/usr/lib/ocaml/stdlib.a' '/usr/lib/ocaml/libasmrun.a' -lm -ldl test3: $ ocamlfind ocamlopt -verbose -o test test.ml -linkpkg -package extlib Effective set of compiler predicates: pkg_extlib,autolink,native + ocamlopt.opt -verbose -o test -I /usr/lib/ocaml/extlib -ccopt -I/usr/lib/ocaml/extlib -ccopt -L/usr/lib/ocaml/extlib /usr/lib/ocaml/extlib/extLib.cmxa test.ml + as -o 'test.o' '/tmp/camlasmf474f8.s' + as -o '/tmp/camlstartup453a69.o' '/tmp/camlstartupe0a59a.s' + gcc -o 'test' '-L/usr/lib/ocaml/extlib' '-L/usr/lib/ocaml' '/tmp/camlstartup453a69.o' '/usr/lib/ocaml/std_exit.o' 'test.o' '/usr/lib/ocaml/extlib/extLib.a' '/usr/lib/ocaml/stdlib.a' '/usr/lib/ocaml/libasmrun.a' -lm -ldl -I/usr/lib/ocaml/extlib -L/usr/lib/ocaml/extlib Note that I have this dynlink installed: $ ocamlfind query dynlink -l package: dynlink description: Dynamic loading and linking of object files version: [distributed with Ocaml] archive(s): linkopts: location: /usr/lib/ocaml I have all latest packages from fedora11 distribution: $ rpm -qa ocaml\* |sort ocaml-3.11.0-3.fc11.i586 ocaml-camlp4-3.11.0-3.fc11.i586 ocaml-camlp4-devel-3.11.0-3.fc11.i586 ocaml-extlib-1.5.1-6.fc11.i586 ocaml-extlib-devel-1.5.1-6.fc11.i586 ocaml-findlib-1.2.3-6.fc11.i586 ocaml-findlib-devel-1.2.3-6.fc11.i586 ocaml-omake-0.9.8.5-7.fc11.i586 ocaml-runtime-3.11.0-3.fc11.i586 ocaml-sexplib-4.2.7-2.fc11.i586 ocaml-sexplib-devel-4.2.7-2.fc11.i586 ocaml-type-conv-1.6.7-1.fc11.i586 $ cat /usr/lib/ocaml/dynlink/META # Specifications for the "dynlink" library: requires = "" version = "[distributed with Ocaml]" description = "Dynamic loading and linking of object files" directory = "^" browse_interfaces = " Btype Bytesections Clflags Config Consistbl Dll Dynlink Ident Meta Misc Opcodes Path Predef Runtimedef Symtable Tbl Types " archive(byte) = "dynlink.cma"