Hi finelly is works!
I tried the way suggested Tetralux via make_standalone_toolchain.py and then clang. Simple echo works, but I tried simple pow from math and clang doesn't compile it: import math var a = pow(5.09, 2.33) clang -I ../sysroot/usr/include -I C:/Nim/lib -fPIE -pie -o C:/Users/uname/Documents/nimapps/jnijava/hello.bin C:/Users/uname/Documents/nimapps/jnijava/nimcache/*.c ...and get error: \nimcache\hello.c:function NimMainModule: error: undefined reference to 'pow' clang50.exe: error: linker command failed with exit code 1 (use -v to see invocation)