Thank you ,Alexei but that didn't work. i had tried, :( i suppose the point is how comes this message when compiling and linking cln :

C:/ooo/1.0/GiNaC1/lib/libcln.a(cl_LF_1plus.o): In function `subx_loop_up': C:\msys\1.0\home\Lenovo\cln-1.3.1\src/./base/digitseq/cl_DS.h:406: undefined reference to `_imp____gmpn_sub_n' it seems that the CLN and GINAC was compiled with position dependent things written into cln lib files ,

By the Way, when i type "pkg-config.exe --libs cln" in MSYS shell, it gives "-LC:/ooo/1.0/GiNaC1/lib -lcln" . it should have been "-L/GiNaC1/lib -lcln" , am i right? wayne